2009 QUARTER MIDGET CLUTCH TYPE DYNOS

2009 QUARTER MIDGET CLUTCH TYPE DYNOS

We now have a low cost Quarter Midget Dyno using a simple jackshaft and clutch. It allows you to start your engine with a simple hand held electric starter, walk over to the dyno, engage the data system, go wide open throttle till maximum rpm, shut off system. Do S.A.E. weather correction, download data and graph it or make reports of any data you wish. It’s accurate enough to see .001” jet changes on gas very easy. I worked with a GX120 and made several changes and saw everything I changed on the computer screen. See acceleration data to see exactly were engine acceleration slows or stops, see engine head temp, exhaust temp, air/fuel ratio, oil crankcase temp, etc. with the right data system. This dynos also allows you to dyno any engine up to 25 to 30 hp with a ¾” or 1” output shaft using any clutch. A Premier Titan is recommended with yellow/red springs. With these larger motors you will be able to dyno all clutches, see engagement rpm, slippage ratio and were total lock-up of clutch occurs or were its back to one to one (direct drive). With the “Pro” software you can overlay up to six graphs at a time, including clutch dyno pulls, click on any part of the graph to see increments of torque/hp in 1/100ths of an increment. Or ZOOM in on any part of the graph down to 30 rpm increments. For example, testing top end headers, (6000 to 6400) rpm. See up to 10 columns of data side by side up to 10 columns wide or see “data & difference” which shows you plus/minus data in the third column running vertically down the page. This is a very simple dyno which will last many years. Software can be run on Windows 95’ to Vista. A basic Celeron laptop will work just fine ($500.00). You may need a USB to Serial port Adapter for newer computers without a serial port or purchase a newer system that works thru your USB ports. We will be glad to explain and quote anything your interested in.

THANKS-STAN HEWITT

HEWITT RACING & MFG., PHONE 1-641-775-3395 OR CELL 1-641-512-3395, FAX 1-641-775-3399 OR E-MAIL: HEWITTDYNO@GMAIL.COM

ALSO CHECK OUT MY BLOG: WWW.HEWITTSINERTIADYNOS.WORDPRESS.COM.

2009 Hewitt Inertia Dyno – Small Engine Inertia Dyno

I HAVE 115 DYNOS IN 28 STATES NOW SO WE HAVE A LOT OF EXPERIENCE!

THIS IS A PATENTED PRODUCT BY STAN HEWITT

THE COMMON DYNOS & OPTIONS WE HAVE AVAILABLE AT HEWITT INERTIA DYNOS ARE NUMBERED BELOW.

**NOTE THAT ALL DYNOS CAN BE UPDATEDOR CUSTOM BUILT OR UPDATED TO LARGER FLYWHEELS AND SEVERAL DATA SYSTEM OR OTHER OPTIONS! ALL QUOTES WILL BE E-MAILED (PDF FORM) AND/OR FAXED DIRECTLY TO YOU SO YOU KNOW EXACTLY WHAT YOU’RE COST IS, INCLUDING FREIGHT! (I WILL NEED YOUR ZIP CODE FOR FREIGHT ESTIMATES)? WE HAVE JUST SWITCHED TO A LARGE GROUP OF FREIGHT SHIPPERS! Very few can beat our prices on flywheel or dyno shipments!

PRICES SUBJECT TO CHANGE!

**ALL DYNOS CAN BE MODIFIELD & CUSTOMIZED TO FIT YOU’RE NEEDS. WE HAVE BUILT DYNOS FOR QUARTER MIDGET RACERS WITH 6 TO 1 GEAR BOXES AND ELECTRIC START FOR GOLF CARTS WITH CLOCKWISE & COUNTERSLOCKWISE ENGINES(dual starters systems, CW/CCW).

WE ARE ALSO WORKING ON AN ELECTRIC CLUTCH DYNO. WE CAN ALSO HELP YOU WITH A BASIC DYNO ROOM IF YOU HAVE QUESTIONS.

We are very interested in building any type of custom dynos, which includes, harleys, cars or trucks, chassis dynos, any type of engine!!!!!!!!!!!

(1) STARTER RELAY UPDATE KIT-($43.87) this is for customers that have my dyno with electric start and wish to update or customers that are putting electric start on their dynos. It includes a wiring harness with (2) relays, a heavy duty fuse link with 30 amp fuse. We’ve found out the solenoid is not getting enough amps when we have a 25 to 30 foot of wiring to the starter. This stops those false starts were solenoid doesn’t engage or were starter seems to crank real slow at first. We also recommend using 2 gauge battery cables. This combination increases cranking speeds by 20 to 25%!

(2) DIRECT DRIVE KIT TO REPLACE ONE-WAY SPRAG & TORSION SHOCK KIT-($106.24) -we have found out the one-way sprag disengages and engages at high engine rpm. By replacing it with a solid shaft and leaving the torsion shock bushing in, we have extremely repeatable results. Five dyno pulls with only 2/100ths of a horsepower difference in some cases.

(3) 1 ¼” ROUND TO 1 3/8”-6 SPLINE ADAPTER KIT ($165.24)-This converts 1 ¼” round shaft with ¼” keyway to one-way sprag clutch and then to a adapter to adapt it to another 1 ¼” shaft. Allows you to put a one-way sprag clutch between your flywheel and your main dyno axle.

(4) 2009 QUARTER MIDGET CLUTCH DYNO OPTION- ESTIMATED COST $605.47-Allows a person to dyno HONDA, WORLD FORMULA, DECO CONTINETIAL 6 to1 gear box engines just like a standard engine- measure torque, horsepower, acceleration, air/fuel ratio, any options you order on data system. I have not put this on a Briggs 6 to 1 (Sun Gear) but it will be possible?

(5) We do make an electric start, belt drive Quarter Midget Dyno (with or without one-way sprag clutch) that dyno off the end of the crankshafts of Honda 6 to 1 gear box motors. This is a “Pro” version dyno, more for the Professional engine builders. I’m not sure this will work on Deco-Continental or Briggs.

(6) 2008 ELECTRIC START COMPLETE KIT-($714.35)-We’ve made some changes, installed a relay kit so solenoid and starter engage better with more amps and installed 2 gauge battery cables. These two changes make starter system crank about 20 to 25% faster. This may help some of you that break belts on the Animal motors. Crank the engine up to a highest flywheel R.P.M., before opening throttle and letting up on ignition switch. This will minimize belt breakage. Also hold brakes down when killing engine, and don’t let up till flywheel rotation has stopped. The “NEW” 2008 belt system helps tremendously!

(7) “NEW” 2008 35MM BELT DRIVE-($999.99)-This comes with two Kevlar belts-This has a larger sprocket on the main dyno axle and a larger driver with more teeth engaged on the engine. This new belt system almost totally eliminates belt breakage, even on animals. We also have a slightly smaller sprocket for customers wanting to dyno very low horsepower engines. Call me with Questions? Replacement belts are about 40% off list price. If your doing a large quality of 2-cycle engines, tell me because we do have a different combination that works with both 2 & 4 cycle but is a little more expensive. Or we can do a jackshaft that will allow multiple gear ratios and combinations. This to is also a little more expensive to.

(8) DATA ACQUISITION SYSTEMS-wiring in shop must be grounded! We can offer a used original datamite system with premium flywheel sensor, complete wiring harness, up to date software with unlock code & license, one channel analog converter box with new 14mm head temp sensor, manual, power supply-$599.99. This will allow you to do S.A.E. weather correction manually. Or buy a USB to serial port adapter & weather modem and have it download thru USB port, ($175.00). I do have a few digital weather stations left for manual S.A.E. weather correction ($150.00) or can supply with modems ($175.00) to download to computer. The New Mini-USB Basic has been out which I did some testing on, works greats. I’ve sold several and zero problems. I sell it in a basic version with internal S.A.E. weather correction, dual temp with head and exhaust/liquid sensor, no engine rpm, so no clutch testing, with rare earth magnets, Pro software, new manual with newest updates, set-up and training over the phone. The above is what most customers want. Price is $1366.28. If you want something cheaper than this, call me, we can do a very basic system and then gradually add to it if that’s what you want? Next step up is Mini-USB PRO, same as what is listed except comes with engine RPM sensor and inductive pick-up box and wiring harness. Price is $1633.68. Next up is the USB III PRO-This includes everything that the USB MINI-PRO has except it has 4 long temp leads/channels for temperature, and 4 sensors, and more expansibility. The 4-cycle people can measure head temp, exhaust temp, engine oil temp, Air/Fuel Ratio all at one time on the computer screen and print out in report form and graph the data. You can also purchase a temp sensor so air temp can be measured as its going into carb. Price is $1735.65. Another option is Air/Fuel Ratio which is an optional price to, but can be measured thru this system. Remember with Pro Software, you can overlay up to six graphs at a time, click on any rpm increment and see hp & torque in 100ths of an increment. ZOOM in on any part of graph down to 30 rpm increments and compare up to 10 columns of data at a time in report form. Go for a wide screen LCD monitor or laptop. Add a color printer or all-in-one (move your old printer to the dyno & get an Epson 600/800 for the office?) and you’ll love it. Don’t forget all these systems can dyno clutches! See engagement RPM, see slippage ratio, see total lock-up of the clutch and again compare up to six graphs at a time! Gotta get the horsepower to the ground! Remember, if you send me your computer/Laptop, I’ll help you with all installation, set-up and training and answer all follow up questions. I train you in not only dynoing engines but how to dyno clutches correctly. You get all my phone numbers for any questions you might have or help with problems at any time. You can fax or e-mail printouts and we can discuss over the phone to make sure you understand al aspects of program?

(9) 14 OZ VIPER LUBE GREASE-($12.75) For Sprag clutch and Pillow Block bearings- grease pillow block bearings at slowest time of the year. This will cause your horsepower to drop slightly for a short time. This is synthetic grease so it is thin in viscosity and will not affect HP as much by low room temperature.

(10) ADD-ON ONE-WAY SPRAG KIT WITH TORSION SHOCK SYTEM-$717.31- This is an option for any of the following dynos. It comes standard with a 75 hp sprag clutch. There is a 100 hp sprag that can be used as any option (add$65.00). This kit is designed for 1¼” or 1 ½” shafts. Larger sizes will be slighter higher. This option allows a one-way sprag clutch to be added on dynos up to 100 hp. Horsepower’s above 100 hp, we’ll use a more expensive sprag clutch if you want one.

(11) 2009 ONE-WAY SPRAG KIT FOR 1 ¾” & 2” FLYWHEEL SHAFTS-$899.99-This is a heavy duty sprag kit for use with flywheels axles 1 ¾” & larger. Includes a 100 hp sprag clutch. Used for engines above 30 hp. This does include the standard torsion shock kit and it to can be updated to larger size if you want? Includes custom built shafts and adapters.

(12) 2009 DUAL ELECTRIC STARTER SYSTEM- $249.99- Adds a second starter system for use with large flywheels when trying to use a wide range of horsepower engines on very large flywheel.

(13) KIT DYNO USING ENGINE CLUTCH, 25 HP FLYWHEEL-$3199.99-You do all the mig welding. I recommend a 175 amp welder with .030” wire or larger. Many of the smaller parts are ready to assemble and many are already welded. This includes a completely assembled balanced flywheel assembly with every part to make a 36” x 36” engine/clutch dyno. You supply motor mount, and computer system, clutch (Premier Titan recommended with red or yellow springs), surge protector. Wiring in shop must be grounded. I do have some used digital weather stations for manual S.AE. weather correction. Used original data systems ( included) with one channel of head temperature, cost about $599.99, which includes premium axle sensor and new 14mm head temperature sensor. Will work on Windows 95 to Vista. Does include newest most up to date software. You can ship me your computer for complete installation of software and set-up and testing ($75.00). Or we can do over the phone which can take about two to three hours for installation and training. Call with zip code for freight estimate. Residential freight will cost $50.00 more. Best if you can find someone with forklift and loading dock.

(14) 2009 P.A.K. CLUTCH DYNO-$3499.99-This is a dyno were I weld the main frame up. Do all work on the flywheel, assemble, remove, computer balance and reinstall, install & tack weld brake bracket, tack weld motor mount rails, tack weld top flywheel cover. Tack weld control stand. You do all finish welding. I will help you with software installation & set-up. You get everything to build a complete clutch type dyno (you use a clutch on the engine to measure hp & tq.) You will need to supply motor mount & complete computer system. For high hp engines above 30 hp, see 40mm dyno.

(15) 2008 BASIC CLUTCH TYPE DYNO-($3922.68)-This is priced with a used data system. We can price with a new system if you want & pay difference. This price includes a 25 hp balanced flywheel with premium NTN Ultra-class pillow block bearings along with a heavy duty sprocket hub and #53 tooth sprockets so you can dyno clutches. It includes a 36” x 36” table with 1 ¼” stress-proof axle, motor mount rails, side panels and one end panel. Powder coated medium silver. If you do not want powder coating-deduct $135.00. You would need to supply international (wide) motor mount with wings, basic computer with color printer. Remember, if your computer crashes, you’ll pay me an hourly wage to reinstall and set-up software, so install new hard drill if it’s over 2 years old. The recommended clutch is a Premier Titan with yellow/red springs ($150.00). I can supply a complete computer system ($549.99 to $749.99) and install software and set-up and test. Optional 29 hp flywheel-add $113.00. This does include a small parts kit to make sure you have everything to get started. This dyno can be updated to electric start and belt drive? For applications above 30 hp, I’d recommend 1 ¾” stress-proof axle or larger (including axle bearings).

(16) 2008 ONE-WAY SPRAG CLUTCH DYNO-($4650.59) This is the same dyno as above #14 except with a large torsion shock bushing, (2) couplers, and a one-way sprag clutch assembly with axle adapter. If you hear an engine pulling down (forgot to put oil in it) like it’s about to lock up, you can let up on throttle and motor will stop and flywheel will coast till you hit the brake system. One-way sprag needs to be greased at least once a month. Sprag can be locked up (grade 8 or 9 bolt) so you can dyno clutches! This price will be with used original data system with head temp sensor. S.A.E. weather correction would be done manually. Again, you will have to talk to me about what data system and options you want. I always quote everything on paper and e-mail (pdf) or fax you the quote. You will need a Premier clutch with yellow/red springs, a motor mount, and a basic computer system with color printer. This does includes small parts kit to get you started. This dyno as a P.A.K. dyno ($4227.90). Call with questions? This will be made so electric start & belt drive can be added at a later date.

(17) 2009 25 H.P. FLYWHEEL WITH SPRAG, ELECTRIC START & NEW 35MM BELT DRIVE-($7026.17)-This is becoming the #2 seller for small engine builders! This dyno has standard a 25 hp flywheel, 2008 electric start, the new 2008 35mm belt drive and includes a one-way sprag clutch. This does include the New USB Basic data system. S.A.E. weather correction can be done by computer with new style data system. It also includes a small parts kit. This dyno is more for the serious engine builder. Optional larger flywheels’ can be installed for their additional price. You will be able to dyno clutches on this dyno with add on (add $200.00). I can supply a computer system (laptop or desktop, $550.00-$750.00) for you along with a printer ($79.99 & up). You will need a surge protector (10 outlet, $39.99) and wiring in shop must be grounded. You will need to supply an international motor mount and high amperage top post battery for electric start and need a 10 to 20 amp battery charger. If you do not want sprag clutch kit-deduct $727.00 from price. Then it will be direct drive, see #17.

(18) 2008 36” PRO DYNO WITH 25 HP FLYWHEEL,DIRECT DRIVE, ELECTRIC START, 35MM BELT DRIVE, 2008 USB PRO DATA SYSTEM –($6564.49)-#1 engine builder dyno! This is my favorite dyno; it’s simple and super accurate! You supply motor mount and battery. You can buy a laptop or desktop from me ($549.99 to $749.99) and have software installed and set-up and test with your dyno. We can also supply super fast printer and 10 ft. USB cable, ($100.00) that way when you get it, in about two hours you’ll be dynoing motors. Or we can use your computer system. Get a basic inkjet printer, USB cable & surge protector and your set. You supply motor mount and top post battery with 10 to 20 amp charger.

(19) THIS IS THE #1 SELLING DYNO. 2001-2008 “PRO” SERIES DYNO-($8368.48) this dyno comes with new USB Pro data system, (4 channel analog temp). This dyno measures 27 ½” x 48” so it will fit thru a 28” door of your dyno room. It has the new electric start system and the new 2008’ Pro 35mm belt drive. It comes with a small parts kit to get you started. This dyno has two separate axles and can have a sprag clutch or can be built direct drive. Normally this is bought will a pro type data system and sold with a complete computer system with printer, surge protector, all cables, etc. We would need zip code for freight estimate. We also should talk about what you want for computer system (laptop, desktop, printer, widescreen LCD monitor, etc.)

(20) ELECTRIC CLUTCH DYNO-MADE FOR ¾” PTO SHAFT ENGINES.-WILL USE 110 VOLT 2 HP MOTOR OR 220V 5 HP MOTOR-Will have its own MCP brake system and own data system. Will dyno all clutches with #35 or #219 chain. Their may be two versions, (1) cheap basic and (1) pro version with belt drive instead of chain in one area. Will have it’s own flywheel. Will be fully welded and powder coated. You will need computer with windows 95 or newer.

(21) 2^ND 36” MODULE-TO ADAPT TO ORIGINAL TABLE-$2921.34- This allows you to have a 34 hp flywheel in your main dyno and have another 34 HP flywheel to adapt to it so you can dyno up to about 70 hp maximum. Has a second brake system, all shafts, bearings, 2nd flywheel assembly with axle & lock collars, safety shields, covers, pivoting feet with rubber isolators, latches, mechanical adapter to engage and disengage 2^nd flywheel, etc. This one is quoted with 1 ¾” shaft and bearings.

HEWITT RACING & MFG.

BRISTOW, IOWA 50611-7716

PHONE 1-641-775-3395

CELL 1-641-512-3395

FAX 1-641-775-3399

04/20/2009

E-MAIL HEWITTDYNO@GMAIL.COM or hewitts@netins.net

BLOG: HEWITTSINERTIADYNOS.WORDPRESS.COM

2009 AXLE-FLYWHEEL ASSEMBLIES

inertia-dyno-flywheel-axle-assemblye2808f-hewitts-inertia-dynos1

2009 AXLE/FLYWHEEL ASSEMBLIES

04/20/09

From experience in building over 120 assemblies, we make sure these are built correctly to allow no axle keyway wear, loosening or wobbling. The flywheel is built to be used as a brake rotor. We have the outside and inside diameter cut with a CNC torch. Both sides are then ground on a Blanchard grinder so they are parallel. Then we weld on a special female type hub assembly. The axle and male hub are put together and torqued up straight using a dial indicator so that the face run-out is less than .015”. We can use any axle size from 1” to 4”.Normally we use 1 ¼” stress-proof steel for flywheels under 30 hp, with keyways cut only were they need to be. We never have a keyway where the bearing is going to ride. We stock axles in 1 ¼”, 1 ½” and 1 ¾” in lengths to 47.5”. We can custom make whatever you want. We stock one-way sprag clutches and torsion shock systems and can get most sizes overnight. If you want us to ship a flywheel/axle assembly to you, we will need your zip code for a freight estimate. We use a “NEW” freight carrier (as of 11/01/08) and these guys have unreal prices compared to what I used to get. Between the drop in fuel prices and the new freight service, your cost might be 50% cheaper than it was a few months ago? Residential deliveries cost an optional $50.00. It’s best to ship to someone with a forklift and loading dock. The flywheel will be banded on a pallet and shrink wrapped. These assemblies include VERY high quality Japanese NTN ULTRA CLASS pillow block bearings with eccentric lock collars unless you do not want them. WE DO NOT RECOMMEND any cheap import pillow block bearings. I have had some of these fail in less than 30 days! We stock & do recommend Loctite Viper Lube grease for the bearings! These (flywheel assemblies) are computer balanced to less than 5 grams at 500 rpm’s. There is a heavy duty sprocket hub included with a 53 tooth #35 or #65 tooth #219 sprocket so you can dyno clutches if you buy the correct software and electronics. You must have engine rpm inductive pick-up box & wiring harness. If you plan on adding electric start or belt drive it is best to add that to axle before balancing the assembly. You can get by and add later if you have to. If you are using a clutch to dyno engines, use a 24 or 29 hp flywheel with a higher gear ratio so you aren’t so hard on your clutch or don’t bring engine rpm much below clutch engagement rpm. For 1” PTO shafts, I’d use a Tobias clutch which comes on most Slingshots karts. For ¾” shafts (Briggs 5 hp & Animals, Clones, Honda, Deco Continental, etc), I recommend a Premier Titan clutch with yellow or red springs. Horsepower ratings are for approximately 15 second dyno pulls. I highly recommend installing the flywheel so that electric start and belt drive can be added at a later date. We do sell dynos in kit form so all you do is weld it up and start using it. You will get every part with a basic blueprint. We build dynos up to 125 horsepower or more with multiple flywheels so you can do 3 hp up to 125 hp. Please note that for flywheels above 30 hp, I recommend 1 ½’’ to 1 ¾’’, or 2 1/4” stress-proof axles and those above 40 hp. The following are the most common flywheels that we sell.

We now build a custom dual #219 & #35 chain sprocket hub (1/2” bore to 2.25” bore) using a QD hub. Normal aluminum sprocket hubs have a very short life due to the constant shock load! I can custom build one a single (1/2” to 2.25” bore with correct bore & keyway) with a steel sprocket if you want?

Prices have gone down since steel has come down 25 to 30 %

1” x 28” rated at 20 hp.-sells for $1554.55

*1.25” x 28” rated 24.16 hp. sells for $1584.10

*1.50” x 28” rated 29.16 hp. sells for $1696.68

1.75”x28” rated 34 hp sells for $1786.75

2”x28” rated 39 hp sells for $1906.07

2.25”x28” rated 44 hp sells for $2442.50

2.5”x28” rated 49 hp sells for $3106.27

3”X 23” rated 26.5 hp sells for $1915.27

4” X 23” rated 35 hp sells for $2821.25

4”X30” rated 104 hp sells for $4068.45

4”x30” no machine work sells-$1556.34

8”x28” rated 158 hp sells for $6624.79

*#1 SELLERS FOR KARTING/SMALL ENGINE DYNOS

These have 1.75” axles, bearings, dual weld-on outer & inner hubs

These have minimum 2 ¼” shaft, bearings, dual outer & inner hubs

We can also make other sizes.

Remember this includes all the labor to do everything including all machine work, all set-up, all welding, several trips to pick & deliver parts, total assembly, welding, computer balancing, (3) “NEW” NTN ULTRA-CLASS bearings, key stock, H.D. sprocket hub, #53 sprocket, crating, banding, shrink wrapping, and put on a pallet for shipping. We do sell used and new data system and new & used digital weather stations.

Check this website for pictures or go to my blog, hewittsinertiadynos.wordpress.com or inertiadyno.com. Give me a call with questions, 1-641-775-3395 or my cell 1-641-512-3395. E-mail: hewittdyno@gmail.com or hewitts@netins.net .

Dyno Flywheel Axle Assembly

Looking to purchase a Dyno Flywheel Axle Assembly that
is balanced to get minimum face run-out? Details below:

COMPUTER CUT-OUT, BLANCHARD GROUND TILL PARALLEL
ON BOTH SIDES, THEN WE WELD ON SPECIAL INNER HUB
AND TORQUE UP WITH DIAL INDICATOR ON FACE
TO GET MINIMUM FACE RUN-OUT.
IF ITS NOT GOOD ENOUGH,WE TAKE IT APART
AND START OVER!

Contact me to purchase:
Stan Hewitt
c 641-512-3395
hewittdyno@gmail.com
twitter.com/InertiaDyno

High Horsepower Dyno – Hewitt Inertia Dyno

This is a dyno for someone who wants to dyno engines from 4 hp up to 100 or more. It uses just a simple mechanical coupler to add one or more of the flywheels. I have four of these dynos in the U.S. We normally install a larger axle to eliminate axle flex of the higher horsepower engines. This machine also had a electrically controlled hydraulic system which could be controlled out side of the dyno room to heat the engine head temp up to 300 degrees or more.  All data systems come with a S.A.E. weather correction system. Most customers order head temperature and some use a exhaust sensor in the crankcase oil to make sure engine is up to temp. Air/fuel ratio is now available as an option.  Questions?  Want to purchase? Call me…

Torque & Horsepower in Relation to Engine RPM

Here’s a multiple dyno graph overlay that includes torque & horsepower in relation to engine rpm. You can compare up to 6 graphs at a time, click on any part of the graphs to compare horsepower or torque at an exact rpm and see that number in 1/100ths of an increment on the right side. This also works when dynoing clutchs.  Do a graph overlay and compare in time to see which clutch locks up first with the least amount of slippage. Very handy when testing and comparing headers, cams, pipes, clutches, etc. or any internal or external part that affects horsepower or power to the ground.

At what RPM does your enginge run best? My dyno will tell you…

Here’s a typical 5 hp Briggs engine shown on a acceleration report. The third column is what I like to use, “Corr Time Diff”. Looking on the far left column under engine RPM it shows to go from 4500 to 4575, it takes .271 of a second to accelerate through that time window. This is a bad example because this is a very tired motor but you’ll see that it surges up & down in time as it accelerates. Then at 5775 to 5850, it just drops off drasticly. If this were a race motor, it’s where you’d want to see maximum engine rpm. This is my test motor for testing new dynos and it’s very tired.

The forth column is very handy too. If a customer has three motors and he knows that at a certain race track he turns the motor say 4500 to 6500. He can dyno all three motors and see which one has the lowest “Corr Total Time”, the forth column.  That engine acelererates  thru that engine rpm range (4500 to 6450) the quickest.

Sling Shot Inertia Dyno – Hewitt Inertia Dyno’s

Used on v-twin briggs engines on dirt type race cars. We made a quick change #40 chain two piece split sprocket so he can change from 3-to-1 or 4-to-1 ratio. This engine has electric start so he just hooks up battery, starts engine, turns on the data system and hits the gas. This dyno is accurate to 1/10th of a horsepower & also is a clutch dyno. Measures engagement rpm, slippage ratio and also measures where total lock-up of clutch occurs.  Interested in a Sling Shot?   Give me a ring.  Stan

Hewitt Inertia Dyno’s 2008 – Pricing & Specifications

HEWITT RACING & MFG.

PHONE 1-641-775-3395

CELL 1-641-512-3395

FAX 1-641-775-3399

E-MAIL click here

THE COMMON DYNOS & OPTIONS WE HAVE AVAILABLE AT HEWITT INERTIA DYNOS ARE NUMBERED BELOW.

**NOTE THAT ALL DYNOS CAN BE UPDATED TO LARGER FLYWHEELS AND SEVERAL DATA SYSTEM OPTIONS! ALL QUOTES WILL BE E-MAILED OR FAXED DIRECTLY TO YOU SO YOU KNOW EXACTLY WHAT YOU’RE COST IS, INCLUDING FREIGHT!( I WILL NEED YOUR ZIP CODE FOR FREIGHT ESTIMATES WITH PRICES SUBJECT TO CHANGE due to STEEL PRICES GOING UP.)

**ALL THE FOLLOWING CAN BE MODIFIELD & CUSTOMIZED TO FIT YOUR NEEDS. WE HAVE BUILT DYNOS FOR QUARTER MIDGET RACERS WITH 6 TO 1 GEAR BOXES AND ELECTRIC START FOR GOLF CARTS WITH CLOCKWISE & COUNTERSLOCKWISE ENGINES. WE ARE ALSO WORKING ON AN ELECTRIC CLUTCH DYNO. WE CAN ALSO HELP YOU WITH A BASIC DYNO ROOM IF YOU HAVE QUESTIONS.

(1) STARTER RELAY UPDATE KIT-($43.87) this is for customers that have my dyno with electric start or customers that are putting electric start on their dynos. It includes a wiring harness with (2) relays, a heavy duty fuse link with 30 amp fuse. We’ve found out the solenoid is not getting enough amps when we have a 25 to 30 foot of wiring to the starter. This stops those false starts were solenoid doesn’t engage or were starter seems to crank real slow at first. We are using 2 gauge cables now.

(2) DIRECT DRIVE KIT TO REPLACE ONE-WAY SPRAG & TORSION SHOCK KIT-($106.24) – we have found out the one-way sprag disengages and engages at high engine rpm. By replacing it with a solid shaft and leaving the torsion shock bushing in, we have extremely repeatable results. Five dyno pulls with only 2/100ths of a horsepower difference.

(3) 1 ¼” ROUND TO 1 3/8”-6 SPLINE ADAPTER KIT ($165.24)-This converts 1 ¼” round shaft with ¼” keyway to one-way sprag clutch and than to a adapter to adapt it to another 1 ¼” shaft. Were you wanted to put a one-way sprag clutch between your flywheel and you main dyno axle.

(4) 2008 ELECTRIC START COMPLETE KIT-($680.70)-We’ve made some changes, installed a relay kit so solenoid and starter engage better with more amps and installed 2 gauge battery cables. These two changes make starter system crank about 20 to 25% faster. This may help some of you that break belts on the Animal motors. Crank the engine up to a highest flywheel R.P.M. before opening throttle and letting up on ignition switch. This will minimize belt breakage. The “NEW” 2008 belt system helps tremendously!

(5) “NEW” 2008 35MM BELT DRIVE-($1251.28)-This comes with two belts-This is a larger sprocket on the main dyno axle and a larger driver with more teeth engaged on the engine. This new belt system almost totally eliminates belt breakage, even on animals. The price can be discounted some when used with other combinations or previous customers wanting to update? We also have a slightly smaller sprocket for customers wanting to dyno very low horsepower engines. Call me with Questions?

(6) DATA ACQUISITION SYSTEMS-There is a Pro system available right now that connects by USB cable. The Pro system has (4) analog channels (example: head & exhaust temp) and with internal S.A.E. weather correction. We normally set it up with two leads, head & exhaust temp, with Pro software, this package sells for about $1399.99. The new mini USB system will have two channels for temp, and have internal S.A.E. weather correction and premium flywheel sensor. This is supposed to be sold at a much lower price. I always recommend “Pro” software which allows up to 6 graph overlays and columns of data side by side up to five columns. You will be able to see acceleration in 50, 75, & 100 rpm increments. By improving acceleration, you will greatly help your customer’s race engines by widening their power band. You will always be able to dyno clutches, see slippage ratio, engagement rpm, and see were total lock-up of the clutch occurs. We can always fax or e-mail you a quote. Training by phone is available and I’m always am available for questions for my customers.

(7) 14 OZ VIPER LUBE GREASE-($12.75) For Sprag clutch and Pillow Block bearings- grease pillow block bearings at slowest time of the year. This will cause your horsepower to drop slightly for a short time. This is synthetic grease so it is thin in viscosity and not affected as much by temperature.

(8) KIT CLUTCH DYNO, 25 HP FLYWHEEL-$2629.99-You do all the mig welding. I recommend a 175 amp welder with .030” wire or larger. Many of the smaller parts are ready to assemble and many are already welded. This includes a completely assembled balanced flywheel assembly with every part to make a 36” x 36” engine/clutch dyno. You supply #35 chain, motor mount, and computer system, clutch (Premier Titan recommended), surge protector. Wiring in shop must be grounded. I do have some used digital weather stations for manual S.AE. weather correction. Used original data systems with one channel of head temperature, included, cost about $549.99, which includes premium axle sensor and new 14mm head temperature sensor. Will work on Windows 95 to Vista. Does include newest most up to date software. You can ship me your computer for complete installation of software and set-up and testing. Or we can do over the phone which can take over two hours for installation and training. Call with zip code for freight estimate. Freight is with 62% discount. Residential freight will cost $50.00 more. Best if you can find someone with forklift or dock.

(9) 2008 BASIC CLUTCH TYPE DYNO-($3838.00)-This is priced with a used data system. We can price with a new system when they are available. This price includes a 25 hp balanced flywheel with premium NTN pillow block bearings along with a heavy duty sprocket hub and #53 tooth sprocket so you can dyno clutches. It includes a 36” x 36” table with 1 ¼” stress-proof axle, motor mount rails, side panels and one end panel. Powder coated medium silver or chrome yellow. If you do not want powder coating-deduct $150.00. You would need to supply international (wide) motor mount with wings, basic computer with color printer. The recommended clutch is a Premier Titan with yellow springs ($150.00). I can supply a complete computer system ($599.99 to 699.99) and install software and set-up and test. Optional 29 hp flywheel-add $80.00. This does include a small parts kit to make sure you have everything to get started. This dyno can be updated to electric start and belt drive? For applications above 30 hp ,see 40mm dyno.

(10) Buy this dyno (above) as a P.A.K. (PARTIALLY ASSEMBLED KIT) ($3099.99) were we weld the main table and install assembled balanced flywheel, build the brake bracket, tack motor mount rails, and you do all the rest of the work. Will require some light welding. This will not be powder coated! Call with any Questions?

(11) 2008 ONE-WAY SPRAG CLUTCH DYNO-($4250.00) This is the same dyno as above #8 except with a large torsion shock bushing, (2) couplers, and a one-way sprag clutch assembly with axle adapter. If you hear an engine pulling down (forgot to put oil in it) like it’s about to lock up, you can let up on throttle and motor will stop and flywheel will coast till you hit the brake system. One-way sprag needs to be greased about once a month. Sprag can be locked up so you can dyno clutches! This price will be with used original data system with head temp sensor. S.A.E. weather correction would be done manually. Again, you will have to talk to me about what data system and options you want. I always quote everything on paper and e-mail or fax you the quote. You will need a Premier clutch with yellow springs, a motor mount, and a basic computer system with color printer. This does includes small parts kit to get you started. This dyno as a P.A.K. dyno ($3549.99). Call with questions? This will be made so electric start & belt drive can be added at a later date.

(12) 2008 40MM CLUTCH DYNO-($4575.00)-The standard flywheel for this dyno is 34 horsepower but you can get optional ones up to 44 horsepower or higher. This is for the higher horsepower 2-cycle or 4-cycle engine. Once you get to a certain horsepower, you can experience axle flex which makes the chains pop off more often. Since getting a 1 ½” or 1 ¾” sprocket hub is almost impossible. It’s better to go with the 40mm axle and sprocket hubs. This dyno does include two 40mm sprockets hubs and I’m sure you could install an axle clutch and another set of motor mount rails if you want to dyno right and left hand motors. You would be able to dyno clutches on the high horsepower 2-cycles or 4 strokes. This dyno can also be made into a multiple flywheel dyno were we make it possible to join (3 or more) 34 horsepower flywheel for things like shifter karts, etc. This would be a custom quote. We have 4 of those type dynos in the U.S. already. Again, this is priced with a used original data system with head temp & sensor. S.A.E. weather correction could be done manually with digital weather station which is built into price or thru computer. We can quote it to you with a used, a pro type system or the new mini USB system which should be available Sept, 2008 Call with questions? It’s best if we talk by phone and determine exactly what you want and I give you an exact quote. Call with zip code for freight quote?

(13) 2008 25 H.P. FLYWHEEL WITH SPRAG, ELECTRIC START & NEW 35MM BELT DRIVE-($7246.00)-This is becoming the #2 seller for small engine builders! This dyno has standard a 25 hp flywheel, 2008 electric start, the new 2008 35mm belt drive and includes a one-way sprag clutch. This does include the New USB Pro data system. S.A.E. weather correction can be done by computer with new style data system. It also includes a small parts kit. This dyno is more for the serious engine builder. Optional larger flywheels’ can be installed for their additional price. You will be able to dyno clutches on this dyno. I can supply a computer system (laptop or desktop, optional price) for you along with a printer. You will need a surge protector and wiring in shop must be grounded. You will need to supply an international motor mount and top post battery for electric start and need a 10 to 20 amp battery charger.

(14) 2008 36” PRO DYNO WITH 25 HP FLYWHEEL,DIRECT DRIVE, ELECTRIC START, 35MM BELT DRIVE,2008 USB PRO DATA SYSTEM –($6515.00)-This is my favorite dyno; it’s simple and super accurate! You supply motor mount and battery. You can buy a laptop or desktop from me ($599.99 to $749.99) and have software installed and set-up and test with your dyno. That way when you get it, in about two hours you’ll be dynoing motors. Or we can use your computer system. Get a basic inkjet printer, USB cable & surge protector and your set. You supply motor mount and top post battery with 10 to 20 amp charger.

(15) THIS IS THE #1 SELLING DYNO. 2001-2008 “PRO” SERIES DYNO-($7816.00) this dyno comes with new USB Pro data system. This dyno measures 27 ½” x 48” so it will fit thru a 28” door of your dyno room. . It has the new electric start system and the new 35mm belt drive. It comes with a small parts kit to get you started. This dyno has two separate axles and can have a sprag clutch or can be built direct drive. Normally this is bought will a pro type data system and sold with a complete computer system with printer, surge protector, all cables, etc. We would need zip code for freight estimate. We also should talk about what you want for computer system (laptop, desktop, printer, etc.)

(16) ELECTRIC CLUTCH DYNO-MADE FOR ¾” AND 1” PTO SHAFT ENGINES.-WILL USE 110 VOLT 2 HP MOTOR OR 220V 5 HP MOTOR-Will have its own MCP brake system and own data system. Will dyno all clutches with #35 or #219 chain. Their may be two versions, (1) cheap basic and (1) pro version with belt drive instead of chain in one area. Will have its own flywheel. Will be fully welded and powder coated. I’m hoping I can take it apart and ship UPS so I can save you money on freight to get it to you. You will need computer with windows 95 or newer.