[F500] 494 engines

[Eric D. Christensen]

On Fri, 2003-11-21 at 08:06, Jan Schmidt wrote:
> While we are on the subject of engines..... A few weeks back, there was
> a discussion of 2 strokes dieing off and replacement possibly being a 4
> stroke 4cyl dohc bike motor. My question is this: Our 2 stroke seem to
> redline about 8500rpms. These bike motors are more like 12K to 16K rpms.
> Will the cvt trans/clutch setups be compatible with the 4 cyl and will
> major adjustments have to be made to gearing. 

Most likely the answer is no. The CVTs we use aren't a good match for a
4 stroke bike motor and would require some serious engineering work to
even mate to the engine. Besides, 4 stroke bike motors already have a
transmission, which we'd undoubtedly use as-is. 

That's not to say that you couldn't develop a CVT for a 4 stroke bike
motor, but it's a significant engineering job and I doubt any of the
readily available snowmobile CVT components could be adapted. You'd
probably have to start from scratch with a lump of billet aluminim and a
CNC mill.

I don't think I'd want a Polaris primary spinning at 12000 RPM 18"
behind my head! I wonder how far the belt pieces would fly when it comes
apart at those sort of speeds...

-- 
Eric D. Christensen <edc at proadmin.com>
Proadmin, Inc.