Rotor and E-shaft lightening
 

How would I go about lightening the rotors or the e-shaft. Is it possible to do this at home? How would it affect the counter weights? Any info on this would be useful, thanks.

really really not recommended unless you have a cnc machine or milling machine or something accurate to do it with. other wise say good buy to the smooth high revs

that will cost you $300 appx to get it re-balanced at Racing Beat.

Wacky, you are probably an expert, do you think that it is worth it?

Im no expert but I just dont feel its necessary unless youre a serious racer. You're better off to just mix matching the parts say 89+ rotors with 81-82 12-A front counterweight/flywheel, and then pay Racing Beat to re-balance it. Otherwise, just save the $$$ for other things say porting, carbs etc etc.

Do not mix the 81-82 counterweights with the '89+ rotors. It will not balance. If you use the 89 rotors, you must also use the '89+ counterweights. The couterweights don't only have to pair with each other, they also pair with the rotors.

:bigthumb: I know but just brainstorming here. :D

so say i have GSL-SE keg, but have s5 internals, i know would need to get lightened flywheel specifically for the s5.......... but would it match up w/ the GSL-SE keg bolts??

clavinpaul, Look at the www.yawpower.com site for some pictures of lighten rotors & e-shaft. You will see that it's not a do at home job.

Hvae Fun ; )
David

Somebody correct me if I'm wrong, but I don't think lightening the eccentric shaft would do a whole lot of good. Rotating weight, yes, but the lobes aren't very offset, so you don't have a lot of weight flying around. In a racing application where you're trying to squeeze half-horsepowers together to gain an advantage, I could see it, but even then I have a hard time beliefing the cost / benefit ratio.

PS - Yaw is a mastermind.

just for clarity here ... so are you saying that if you were to have those parts and planned on building an engine out of them, sending them to get professionally balanced would be impossible because you need specific frount counterweights to balance the rotors?

i'm not trying to put you on the spot, i'm just not clear because i thought the front counterweight was balanced by the flywheel and (rear counter, if automatic or aluminum flywheel is used). :confused:

I guess it would be physically possible for someone to balance them for you. If you aren't having anything balanced by anyone, you definitely don't want to mix and match. In reality the difference in weight between all of the counterweights isn't very much and it would take a postal scale to detect the differences. If you were planning on sending them out to be balanced I guess it wouldn't really matter a whole lot which ones you use. If the front and rear counterweights were only there to balance each other, we just wouldn't use them and the flywheel wouldn't have the offset counterweight built into it. They do balance the rotors too. Even though I said the weight difference is small between counterweights, if you start up an engine that has the wrong one installed, it is very noticable. It feels like an earthquake. with enough money and effot, any combo can be made to work.

okay, that's what i thought. no, i knew that the counterweights balanced the rotors as well as each other. it's just that your previous had me thinking i misunderstood the critical points of the rotating assembly. that's all ... :) i'm pretty quick to doubt myself.