EBAY: NEW HEWITT INERTIA ENGINE-CLUTCH DYNO DYNOMOMETER

THIS E-BAY ITEM IS A CLUTCH TYPE INERTIA ACCELERATION DYNO. IT USES THE CLUTCH ON YOUR ENGINE.

CLICK HERE TO GO TO E-BAY LISTING

IT WILL COME WITH A 30 HP FLYWHEEL.  IT COMES WITH  A ADJUSTABLE HEIGHT CONTROL STAND WITH THROTTLE CABLE, KILL SWITCH & WIRING, BRAKE SYSTEM & LINES, & THROTTLE ASSEMBLY. IT WILL COME WITH A USED 4 CHANNEL  DATA ACQUISITION SYSTEM THAT HAS HEAD TEMPERATURE AND (1) NEW 14MM TEMP SENSOR.  THIS ALLOWS YOU TO MEASURE HORSEPOWER, TORQUE, ACCELERATION, HEAD TEMPERATURE, CLUTCH ENGAGEMENT, SHIPPAGE RATIO, WERE TOTAL LOCK-UP OF CLUTCH OCCURS. IT WILL ALSO COME WITH A USED DIGITAL WEATHER STATION SO YOU CAN DO MANUAL S.A.E. WEATHER CORRECTION. IT WILL ALSO COME WITH A SMALL PARTS KIT TO GET YOU STARTED, KEYS, SHIMS, CLUTCH BOLTS, BRAKE BLEEDER, ETC.  I DO HAVE A PALLETING FEE INCLUDED, WHICH MEANS, IT WILL BE BOLTED ONTO A PALLET AND SHRINK WRAPPED, THEN TOTALLY ENCLOSED IN PANELLING TO PROTECT IT DURING SHIPPING. YOU WILL NEED A FORKLIFT OR SOMETHING WITH FORKS TO UNLOAD DYNO (900 LBS). NORMALLY DYNO IS POWDER COATED A MEDIUM SILVER, MAINLY BECAUSE MY POWDER COATER DOES BEST BUY SHELVING ALL THE TIME AND THAT IS THE FASTEST IN & OUT OF THERE PLACE.  THIS DATA SYSTEM WILL WORK WITH ANY WINDOWS PROGRAM, 95′ TO VISTA. IT DOES NEED A 9 PIN SERIAL PORT OR WITH NEWER COMPUTERS WE USE A USB TO SERIAL PORT ADAPTER ($40.00). THE S.A.E. WEATHER CORRECTION CAN ALSO BE DONE THRU THE COMPUTER THRU USB PORT ALSO. THIS IS THE SIMPLEST DYNO  I BUILD. WE HAVE 108 DYNOS IN 27 STATES IN THE U.S. AND ALSO MANY FLYWHEELS AND DATA SYSTEMS CUSTOMERS I ALSO TAKE CARE OF. SEE MY BLOG FOR COMPLETE INFORMATION WWW.HEWITTSINERTIADYNOS.WORDPRESS.COM . THERE IS A LOT MORE PICTURES AND INFORMATION THERE THAT WILL HELP YOU WITH QUESTIONS OR CALL ME AT 1-641-775-3395 OR CELL 1-641-512-3395. I WILL NEED YOUR ZIP CODE TO ESTIMATE FREIGHT???????? THIS BID IS FOR THIS BASIC CLUTCH DYNO. IF YOU WANT ANY OPTIONS LIKE LARGER FLYWHEEL, DIFFERENT DATA SYSTEM, ETC. WE WILL HAVE TO ADJUST PRICE AFTER SALE OF THIS DYNO. THIS DYNO IS FOR ENGINES FROM 5 HP UP TO ABOUT 25 TO 30 HP.  DIMENSIONS OF THIS DYNO ARE 36″ X 36″. I CAN HELP YOU WITH DYNO ROOM BASICS BLUEPRINTS OR SPECS. NORMAL PRICE FOR THIS DYNO IS $4100.00 PLUS MY COST OF FREIGHT  TO SHIP IT.  E-MAIL ME FOR FREIGHT ESTIMATE, HEWITTDYNO@GMAIL.COM OR HEWITTS@NETINS.NET.  YOU WILL NEED TO SUPPLY INTERNATIONAL ANGLE OR FLAT MOTOR MOUNT AND COMPLETE COMPUTER SYSTEM. WIRING IN SHOP MUST BE GROUNDED AND I RECCOMEND A SURGE PROTECTOR.

THANKS-STAN HEWITT

AFTER MONEY IS RECEIVED, EXPECT TWO TO THREE WEEKS BEFORE DYNO WILL ARRVIE AT YOUR PLACE. THIS IS A CUSTOM BUILD DYNO AND THERE ARE MANY PARTS OF THE DYNO THAT CAN BE CHANGED AND/OR MODIFIED FOR YOUR APPLICATION, SO WE WILL BUILD TO YOUR SPECS.

Hewitt Inertia Dyno – 2001 TO 2009 “PRO” SERIES DYNO

2001 TO 2009 “PRO” SERIES DYNO

This is the number #1 selling dyno for me. The “new” 2009 models have a new synchronous belt drive system that has almost totally eliminated belt breakage. With the old 30mm belt drive, a customer could break two to three belts a month with heavy use.

The new system uses a wider Kevlar belt with larger pulleys both top & bottom.

The “new” electric start system also has been improved. We’ve went to larger battery cables. We’ve also went to a starter relay system so the starter gets more voltage and amperage. Cranking speeds have gone up 20 to 25 percent. This helps start the engine quicker. No more fast starts or clicks of the starter with the dyno turning over.

This dyno comes standard with a 25 hp flywheel. Many of you want a 30 hp flywheel for the animal Ltds & some over engines coming into popularity. The longer the dyno pull in time (seconds), the more accuracy. This dyno comes standard with a torsion shock system and a 75 hp one-way sprag clutch. An optional 100 hp sprag clutch is an available for a small optional price. We do offer another dyno with flywheels up to 49 hp that can use a one-way sprag clutch. The reason we’re going to a different flywheel is to save you money in freight costs!

The pictures highlight some of the most common used options.

This dyno normally comes with one-way sprag clutch or can be bought for about $717.00 less without sprag clutch & torsion shock system. So this dyno would be electric start direct drive.

Kart Engine Dyno – Inertia Dyno

THIS IS OUR #1 SELLING DYNO. 2001-2009 “PRO” SERIES DYNO- 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.)  –

$7999.00 – call me and I can give you all the details

or I can make one specifically for your needs.

~ Stan

c 641.512.3395

Chinese Clone Motor on Gas‏ – Engine Dyno

Here’s a dyno pull comparasion of a Chinese yellow clone motor on gas. We started with a stock engine with a stock muffler, put in 16 oz. of 10w30 oil and did a couple of dyno pulls. Engine ran very bad, sounded like a bad spark plug. As you can see by the lower dyno pull engine surged very bad due to very lean condition. Made 4.6 hp at maximum at 3000 rpm. First thing we did was remove stock muffler and replace it with a small header we got from ARC.  Really didn’t help much, engine still very lean. Drilled main jet out to .037″ and dyno again. Engine souded very strong and made big jump in horepower. We then tryed Animal springs instead of stock springs. Really didn’t do anything, in fact lost hp on top end. Went back to stock springs and stuck on large RLV header. Made a pretty good jump in hp. Ended up with large RLV header and .036″ jet. I don’t think this header will be legal for the rules that I skimmed thru very quickly but just for your infomation. I think the small header from ARC ran best with a .035″ jet.  I know A.R.C.  & J.C. Specialtys both have parts for these.
About 5400, this motor really fill off. A couple of people have told me spring pressures will make a big difference but they will not be legal!
The dyno sheet show a comparision of a bone stock engine with how we ended up with all stock parts except for jet change. Tightening valve lash settings didn’t make much differance. Ended up gogin back to .003″.  Max torque was at 3600 rpm, peak hp at 4900 after jet change.

Interested in Purchasing a Hewitt Inertia Dyno?

Call me today…

Stan Hewitt
c 641-512-3395
hewittdyno@gmail.com
twitter.com/InertiaDyno

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

My Number 1 Selling Dyno – Hewitt Inertia Dyno’s

THIS IS THE #1 SELLING DYNO. 2001-2008 “PRO” SERIES DYNO- 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.)  — $7816.00 – call me and I can give you all the details or I can make one specifically for your needs. ~ Stan c 641.512.3395

Dyno Axles & Flywheel Assemblies (2008) – Small Engine Dyno’s

2008 AXLE/FLYWHEEL ASSEMBLIES

From experience in building over 110 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” including metric up to 50mm.

Normally we use 1 ¼” stress-proof steel 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” and 1 ½” in length to 47”. We can custom make whatever you want. We can also build 40mm at a slightly higher price. 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 R&L Carriers since they have Tommy lift type tailgates to get the assembly to the ground and you can get it into your shop with a pallet jack. Residential deliveries cost an optional $50.00. Its best to ship to someone with a forklift or loading dock. I give a 65% discount off of list price. The flywheel will be banded on a pallet and shrink wrapped. These assemblies include high quality Japanese NTN pillow block bearings with eccentric lock collars. They are computer balanced to less than 5 grams at 500 rpm’s. There is a heavy duty sprocket hub included with a 53 tooth sprocket. If you plan on adding electric start or belt drive it is best to add that before balancing the assembly. If you are using a clutch dyno, use a 24 or 29 hp flywheel with a higher gear ratio so you aren’t so hard on your clutch. I recommend a Premier Titan clutch with yellow springs. Horsepower ratings are for 15 second dyno pulls. I highly recommend installing a 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 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 40mm stress-proof axles and those above 40 hp to use 1 ¾’’ or 2’’ stress-proof axles. The following are the three most common flywheels that we sell.

1.25” x 28” rated 24.16 hp. sells for $1681.42

1.50” x 28” rated 29.16 hp. sells for $1761.07

3” x 23” rated 26.5 hp sells for $1759.85

Remember this includes all the labor to do everything including the machine work, assembly, computer balancing, (3) new NTN bearings, key stock, H.D. sprocket hub, #53 sprocket, crating, banding, and put on a pallet for shipping.