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


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.


One response to “Dyno Axles & Flywheel Assemblies (2008) – Small Engine Dyno’s

  1. can you send me some info on the dyno
    thank you Tommy

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