anybody got a pic of a lightened stator, cam sprocket, or anything else they've done?

 

I believe team Pami has pictures of lightened cam sprockets on there engine kit pages.

cam pic

 

thanks, that's what I'm looking for...
Now for the stator, and whatever else anybody may have lightened....

 

I have a spare stator that I want to lighten sometime. I've asked about this stuff before and I believe Scooby has a Pami lightened stator hub and the gear that goes behind the stator. I think the stator would be the main item to lighten as it is a flywheel. After getting the lightest wheels and tires that is! Inertia has as much to do with mass as it has to do with distance to center of rotation.

 

oops I meant to say flywheel all this time - the actual rotating mass is what I'm wanting to shed.

So yeah, how about pics of these lightened flywheels.
I know Pami does it, and I know the Preacher has them done....I wanna see one, and I wanna know the actual weight shed.

My wheel hubs weighed 6.07 lbs prior to chucking them in the lathe (for the pair, lug bolts removed), and now they're 3.8lbs.
The sprocket hub shed 3 lbs going to aluminum.
The sprocket nearly a pound going to aluminum.
A few ounces off the chain too.
I've dropped 7 lbs. just off axle rotation, tires and rims not included, and yes the acceleration gain is noticable. I do not run the lightest tires and rims though, because I need durability too so I run .160 and extreme haulers because the antiflex properties of the thicker paddle is just what the doctor ordered for me and my weight and she's never been a better wheelie monster as a result. I'm not strictly drag, so everything I do has to be in the name of the entire ride as a whole, not just the strip, and these weight savings are appreciated on track and trail.

Its a weekend and weekends are slow, maybe I can get somebody on here with a Preacher built motor later this week to clue us in more on these flywheels Mysteried. So how'd you come by a spare?

 

Preach lightened mine (flywheel), I think they shave it down around an inch to a little above the bolt holes.( but dont quote me on the inch guestamate)


Hey Hightower, what kind of gain do ya think we can see from lighter cam sprokets, Maybe ill try that if it isnt done already. Is it something we could do our self, or does a machine shop need to do it?

 

By lightening the internal mass of the engine, is your goal to have a quicker revving engine? Won't low end power be loss and be more prone to stalling at low rpm?

 

Hightower, I picked up a spare by watching the BMWf650 Ebay auctions. It's slightly different than the DS but should work. I too run .160 wall rims but my tires are 3lbs lighter each than Extremes and as I stated earlier the distance from center is important when considering rotating weight.
BTW, don't cam sprockets turn 1/2 rpm to engine rpm? making those pretty far down the list for mass removal.
Sandaholic, Yes you can turn an engine into an easy stalling bear but that's more common with 2 strokes. Our fourstroke has a counter ballancer and cams plus a nice heavy flywheel (stator). Every part in the Rotax is heavy duty, all the gears and shafts, the crank can all support up to 100 +hp so are all able to shave a little weight and still be durable.
My last bike (CR500) I added a flywheel weight to.[img]i/expressions/face-icon-small-confused.gif[/img] It stalled too much in the woods.

 

yes the mass from lightening the cam sprockets is very minimal, and I seriously doubt you would recognize much of anything from doing it alone. but i'm guessing it takes all or nothing to recognize any substantial gains. I've been inside the head of a TRX450R recently, and its pretty cool man. The cam is bored hollow even. and the YFZ, well that thing even has holes in the sides of the cam lobes!!
Pami has been lightening the cam sprockets as part of a package, along with crank mods, lightened rod, etc.
MRHP's superlight piston, along with any and all lightening of rotational mass like we're talking, is power without additional fuel or heat. This is what intrigues me so much - you would actually get better economy and life as a bi-product of more power, when typically you gotta burn more fuel to gain power.

I wish Preacher was on the forum - I wanna know how much weight is actually removed, and where its removed from in regards to how far from center.
And what, if anything, can or has been done to the counterbalancer along these lines?

 

Gary-TVI was trying to put together a DS engine without the counterbalancer. I never heard how that turned out.