Holy crap - price for resurfacing Dual Mass FLW?!

[Sean]

Everything I have heard says you can use a 325i flywheel on a 325e, I believe that reference sensor Josh talked about is on the tranny itself as far as I know. You just need a 325i clutch and throw out bearing to make the flywheel work.

Which is why the tranny's cannot be switched!

I'm thinking you're probably exactly right. Thanks, TJ.

Now - regarding that flywheel. I was going to look around and see just how much an aluminum flywheel would cost me. I was probably going to get a Metric Mechanic lightened one - use that, put it in - then when i get the single mass out of my IS, send that in for my core deposit.

Do you know of a place that has aluminum flywheels? I'm not sure if I'll be able to afford that though. :x

Thanks guys!

I know www.apexengineering.com can get aluminum flywheels, they usually cost $400-600. Jordan's flywheel was lightened to 12lbs, which is a nice drop from about ~20 stock for a single mass, and the alu ones are 8-10lbs for the M20. Jordan paid around $100 to have his lightened... so you can see which is a better deal. Then again, I had mine lightened for $100 and my machinist was only comfortable bringing it down to 15lbs.

So you guys had your original flywheels lightened at a local machine shop, then?

See - doesn't that make more sense? Pay $100 to ahve the stock single mass lightened, instead of resurfacing a dual mass beast? LOL

[bmwe3]

i got my dual mass resurfaced for 50 took 20 mins. yours looks like its out of a E get a I flywheel and save weight. BUT if thats out of a m50/s50 DO NOT RESURFACE it i learned that the hard way the dealer tech told me that if its not balanced 110% its gonna vibrate he highly recomended to get another one but i did it anyway and now i have alot of vibration in the car so the engines gotta come back out its a e30 m3 s50 and i gotta get new flywheel going alum. It was something about the dual mass and the m3 flywheel have the slip, it lets the 2 pieces of the flywheel move 1/4inch back and forth and its almost impossilbe to hold them straight while machining them.

[bmwe3]

the company that did my flywheel is clutchmasters.com in fontana ca

[Jand3rson]

i got my dual mass resurfaced for 50 took 20 mins. yours looks like its out of a E get a I flywheel and save weight. BUT if thats out of a m50/s50 DO NOT RESURFACE it i learned that the hard way the dealer tech told me that if its not balanced 110% its gonna vibrate he highly recomended to get another one but i did it anyway and now i have alot of vibration in the car so the engines gotta come back out its a e30 m3 s50 and i gotta get new flywheel going alum. It was something about the dual mass and the m3 flywheel have the slip, it lets the 2 pieces of the flywheel move 1/4inch back and forth and its almost impossilbe to hold them straight while machining them.

I think that's probably one of the most incoherent things I've ever read. Try using some punctuation.

[Sean]

i got my dual mass resurfaced for 50 took 20 mins. yours looks like its out of a E get a I flywheel and save weight. BUT if thats out of a m50/s50 DO NOT RESURFACE it i learned that the hard way the dealer tech told me that if its not balanced 110% its gonna vibrate he highly recomended to get another one but i did it anyway and now i have alot of vibration in the car so the engines gotta come back out its a e30 m3 s50 and i gotta get new flywheel going alum. It was something about the dual mass and the m3 flywheel have the slip, it lets the 2 pieces of the flywheel move 1/4inch back and forth and its almost impossilbe to hold them straight while machining them.

Yes, it's out of a Super Eta - 1988 325.

I'm not seein anywhere so far that will resurface it for that much.

[Sean]

So, can anyone 100% clerify that the Eta flywheel does not have a reference sensor, and it's instead inside the tranny?

[Sean]

So, can anyone 100% clerify that the Eta flywheel does not have a reference sensor, and it's instead inside the tranny?

And, I'm going to assume that this is true. If it is not, please speak asap! :)

[oskard]

on euro cars it depends on what model your car is don't know about US cars..

also I use a singlemass e21 323i flywheel with a "dualmass" e30 clutch and that
works perfectly together, why is it you guys say you can't use a "dualmass" clutch
with a singlemass flywheel ? maybe its a us vs euro thing ?

[MR 325]

My guy here will lighten and resurface my flywheel for $100

[bmwe3]

i got my dual mass resurfaced for 50 took 20 mins. yours looks like its out of a E get a I flywheel and save weight. BUT if thats out of a m50/s50 DO NOT RESURFACE it i learned that the hard way the dealer tech told me that if its not balanced 110% its gonna vibrate he highly recomended to get another one but i did it anyway and now i have alot of vibration in the car so the engines gotta come back out its a e30 m3 s50 and i gotta get new flywheel going alum. It was something about the dual mass and the m3 flywheel have the slip, it lets the 2 pieces of the flywheel move 1/4inch back and forth and its almost impossilbe to hold them straight while machining them.

I think that's probably one of the most incoherent things I've ever read. Try using some punctuation.

ill type and you spell check for me. Im not trying to ge a A+ from you everyone read it and understood it.

[trent]

Some of you guys arn't sure what you are talking about.

For all the cars that have two reference sensors on the driverside of the bellhousing, that flywheel DOES have a little trigger that sticks out of the flywheel to trigger those sensors. Most dual-mass etas have these tranny sensors and flywheel trigger. You cannot use a single mass late E30 flywheel if it does not have a trigger -- you car will not run!

Late E30s DO NOT HAVE triggers on the flywheel as they pull crank siginal off the front pulley.

[Bill 84 318i]

Yeah, damn.

On Eric's (e9nine's) supereta, there were zero sensors on the bellhousing/flywheel. The signals were pulled from the front crank pulley, so I'll assume it's the same for all supereta's.

The single mass flywheel bolted right on, but he had major problems. He busted the outside springs (not sure of the name...there are three of them and they hold the friction surface to the main part of the pressure plate) three times. After the third time, we put the dual mass flywheel back in and all was well. But something was seriously wrong with the combination that caused those springs to bust over and over again.

[Sean]

Yeah, damn.

On Eric's (e9nine's) supereta, there were zero sensors on the bellhousing/flywheel. The signals were pulled from the front crank pulley, so I'll assume it's the same for all supereta's.

The single mass flywheel bolted right on, but he had major problems. He busted the outside springs (not sure of the name...there are three of them and they hold the friction surface to the main part of the pressure plate) three times. After the third time, we put the dual mass flywheel back in and all was well. But something was seriously wrong with the combination that caused those springs to bust over and over again.

I'm interested in hearing more about this, since my situation would be identical - having a Super Eta and all.

So, each time those broke, you needed a new pressure plate, correct? Did you guys use a throwout bearing and pressure plate meant for the single mass (M20/B25) flywheel? (instead of the normal dualmass pressure plate and throwout bearing?

That sounds like something that would happen with an incorrect throwout bearing or something.


For everyone's information - I called Metric Mechanic today - they want $400 for a lightened flywheel. After sending in the core, they will return $150 to me for that. Their lightened flywheel is about 11-12 lbs. They also told me I could switch to single mass on my car.

[Bill 84 318i]

I wish I could tell you more. All of the proper parts were used for the swap.

The inside of the bellhousing and the starter were torn up real bad too (I assume from the loose springs flying around). I have pictures somewhere, I have to find them and I'll post them. I know that people have swapped before and had no problems...this kinda seems like an isolated incident. Couldn't figure out for the life of us what had happened though.

I'm pretty sure the TO bearings are the same, but the pressure plate is obviously different. The single masser is way taller.

[Sean]

I wish I could tell you more. All of the proper parts were used for the swap.

The inside of the bellhousing and the starter were torn up real bad too (I assume from the loose springs flying around). I have pictures somewhere, I have to find them and I'll post them. I know that people have swapped before and had no problems...this kinda seems like an isolated incident. Couldn't figure out for the life of us what had happened though.

I'm pretty sure the TO bearings are the same, but the pressure plate is obviously different. The single masser is way taller.

Yea, that's what I was thinking.

If I could see the pics that would be awesome.

It definately does sound like an isolated incident. Since, realistically, everything should work fine.