Bike Engines

[karthickbruce]

hi everyone i ve doubt about engines is it mandatory to use only rotax or other aircraft engines in gyrobee shall i use 2 stroke bike engines for example honda CR500 has got same power and weight..

[scottessex]

This has been tried before.....Bike engines usually have trouble keeping the heads cool. plus you have to drag around all that weight of the transmission. And still need to put a reduction drive on it. I won't say that it cannot be done......but a snowmobile engine is so much easier to convert, and lighter.

You could always use a chain drive and shift gears.

[karthickbruce]

are you saying to use snowmobile engine with chain drive? Has anyone used this engine? which snowmobile engine is best for gyrobee?? whats the difference between snowmobile and bike engines?

[PalmPilot]

Bike engines usually have a transmission as part of the motor, snowmobiles don't. On the PTO side of the motor, either a PSRU-prop speed reduction unit, or a gearbox is used. For a gearbox it needs to have a provision (bolt holes) like with a rotax 503 or 582 for example or some type of adapter as used with other experimental engines.

Check out Racer's thread for example under: Engines :)

Mike

[Racer]

are you saying to use snowmobile engine with chain drive? Has anyone used this engine? which snowmobile engine is best for gyrobee?? whats the difference between snowmobile and bike engines?

Here is some threads you may find interesting

Scott Essex put a Artic Cat snowmobile engine on a Dominator http://www.rotaryforum.com/forum/showthread.php?t=20187&highlight=snowmobile

This one may work on a Bee but has not been tried yet
http://www.rotaryforum.com/forum/showthread.php?t=20906&highlight=snowmobile

These next two threads are the Yamaha 120 hp. Much too much motor both horsepower and weight for a bee but you may be interested in them anyway

http://www.rotaryforum.com/forum/showthread.php?t=16100&highlight=snowmobile

http://www.rotaryforum.com/forum/showthread.php?t=19403&highlight=snowmobile

[gyro]

If you can get a Harley motor they have a seperate transmision not built into the motor but you will more than likley need a redrive unit custom built.

I have heard that Harley engines develope a lot of power at lower RPM so a nice stubby propeller may be fine for direct drive.