Flywheel and Axle Assemblies 2010

From experience in building over flywheel 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 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 3/4” in length to 47.5”. We can custom make whatever you want.  We stock 75hp & 100 hp 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.  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 unless you do not want them. DO NOT USE any Chinese cheap pillow block bearings. We have very bad results with these. They (flywheel assemblies) are computer balanced to less than 5 grams at 500 rpm’s. There is a heavy duty sprocket hub included with a sprocket so you can dyno clutches if you buy the correct software and electronics.  If you plan on adding electric start or belt drive it is best to add that 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. For 1” PTO shafts, I’d use a Premier clutch.  For ¾” shafts (Briggs 5 hp & Animals, Honda, etc), I recommend a Premier Titan clutch with yellow/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 with multiple flywheels so you can do 3 hp up to 125 hp. Please note that for flywheels above 26 hp, I recommend 1 3/4’’ or 2” stress-proof axles and those above 40 hp to use  2’’ stress-proof axles. 1 ¾” bearings will last about 20% longer than 1 ¼” on most inertia dynos!  The following are the most common flywheels that we sell.

1.00”X28” rated at 20 hp-sells for $1482.03

1” x30” rated at 25 hp-sells for $1549.91

1.25” x 28” rated 24.16 hp. sells for $1598.87

3” x 23” rated 26.5 hp sells for $1609.67

1”-1 ¼”or 3”  have 1 ¼” stress-proof axles

1.50” x 28” rated 29.16 hp. sells for $1780.01

1.75”x28” rated 34 hp sells for $1798.14

2” x 28” rated 39 hp sells for $1829.06

1.50”-2.5” have 1 ¾” stress-proof axle.

3” x 23” rated 26.5 hp sells for $1730.87

2.5” x 28”rated 50 hp-sells for $2241.17

3” x 28” rated 60hp-sells for $2428.55

4” X 23” rated 33.3 hp sells for $2699.99

*these have 1 ¾” or larger axles, bearings, hubs, etc.

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

1 ¾” axle have a 50mm sprocket hub that bored out to 1.75” and has a 3/8” keyway broached into it with NTN bearings, etc.  We do sell used and new data system and used digital weather stations.

Check this website for pictures.  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