shaving a flywheel

[AdironRider]

M42 flywheels are the heavist at almost 28 lbs. You can swap in a m20 flywheel/ clutch and modify the starter and you should be money.

[Berlin]

what about m42 flywheels

[MrK]

How about just swapping the flywheel for one from an e21? Anyone know if that would work?

[Digitalwave]

You could say that, since you are minimizing driveline loss.

[sweetride01]

Is it somewhat comparable to adding hp?

[Digitalwave]

The average shaved M20 flywheel goes from 19-20 lbs to down to 13-15 lbs. The difference of 5-6lbs is VERY noticable, as it would be in the 5-6lbs additional difference from a shaved M20 flywheel to an aluminum one.

[erik325i]

Most aluminum flywheels are 8lbs, you can't come close to that with a stock one.

Does that extra three pounds make a big difference?

-Erik

[Digitalwave]

Is there any point whatsoever in buying a lightweight flywheel, if you can have the stock one made almost as light for 1/4 of the cost?

Most aluminum flywheels are 8lbs, you can't come close to that with a stock one.

[Ray Smoodiver]

Mine went in like this at 19.35lbs:



Came out at 13.55lbs like this:

[sweetride01]

Is there any point whatsoever in buying a lightweight flywheel, if you can have the stock one made almost as light for 1/4 of the cost?

[SlammedE30]

I've got a machinist who's done about 5 or 6 E30 flywheels for me. The avg. weight ended up at 13lbs, I had mine done even lower to 11lbs. No problems whatsoever, so the estimate of 6lbs being the max you can remove is probably just to cover your machinist's ass.
-Ted

[Digitalwave]

My flywheel was 15lbs when finished, Jordan's is 12lbs. It really depends on your machinist.

[e30 gangsta]

If you look at the flywheel, you will see a huge mass of material on the back of the flywheel. You can safely remove all of that material with no ill effects. If you do that, I think it will bring it down to around 12 lbs I think. There is no real point of only shaving off a few pounds. If you are going to do it, might as well remove all of that material from the back of the FW.

-Erik

Incorrect. ( I think ) They told me max was 6 lb before the flywheels looses it rigidity and starts warping. I got a few pounds taken off and it balanced out ok. I wouldnt go more than 6 pounds on mine. Anyone wanna chime in on this.

[erik325i]

I thought a stock flywheel is like 24lbs. I could be wrong. I have also heard people getting them down to 12lbs also. E30 gangsta is if better to only have a few pounds shaved off?

If you look at the flywheel, you will see a huge mass of material on the back of the flywheel. You can safely remove all of that material with no ill effects. If you do that, I think it will bring it down to around 12 lbs I think. There is no real point of only shaving off a few pounds. If you are going to do it, might as well remove all of that material from the back of the FW.

-Erik

[silverfbimmer]

I thought a stock flywheel is like 24lbs. I could be wrong. I have also heard people getting them down to 12lbs also. E30 gangsta is if better to only have a few pounds shaved off?