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View Full Version : Dual mass or single mass flywheel?


SamE30e
09-17-2007, 08:30 PM
Ok so I'm in the process of getting a clutch from a forum member on here, but the deciding factor is if my car has a single mass or dual mass flywheel. I've searched far and wide on forums and still don't know. Whats the easiest way to tell?

Thanks
Sam.

SamE30e
09-18-2007, 12:16 PM
Anyone?

325man
09-18-2007, 12:41 PM
i dont know if this would work, but go to BMW and tell them your VIN... just an idea

SamE30e
09-18-2007, 01:35 PM
Yea the closest bmw dealer is on the other side of the city. I guess I could do that. I messaged bimmersport and eurostyle to ask if they know, and if it is dual mass, do they have a single mass flywheel that I could buy off them.

325man
09-18-2007, 04:36 PM
is the single mass a direct swap in.. ive heard the eta tranny bellhousing is longer than the b25, so it could fit the bigger flywheel

SamE30e
09-18-2007, 11:37 PM
is the single mass a direct swap in.. ive heard the eta tranny bellhousing is longer than the b25, so it could fit the bigger flywheel

Thats what i'm trying to figure out, no one answers me lol. I e-mailed Turner Motorsports.

Aveman
09-19-2007, 03:02 AM
If you have an eta you have a dual mass, you'll need to buy a single mass flywheel to run a 325i clutch. The dual mass is heavy as shit so you'll rev faster but if you still have the stock redline of about 4.5K you may feel you have less torque down low with the lighter flywheel? Tranny bolts up the same with a single mass flywheel installed. Your slave cyl will seem too short once you put things back together just keep pumping it till it extends out enough. You may have to push down and pull back up the clutch pedal by hand a couple times at first.

BTW I'm running the above mentioned setup and it's working for me.

T.Dot_E30
09-19-2007, 07:10 AM
If you have an eta you have a dual mass,

That is not true, not all eta's came with a dual mass, there was a switch over at some point. The hard part is telling what you have without physically taking it apart.

SamE30e
09-19-2007, 03:02 PM
That is not true, not all eta's came with a dual mass, there was a switch over at some point. The hard part is telling what you have without physically taking it apart.

Which is what i'm trying to do, because I don't want to buy the clutch off you and realize that I need a new bellhousing because they're different sizes or something along the line. But if its just a flywheel I need i'll goto the wreakers or a shop and see if they have a single mass laying around I could buy.

Aveman
09-19-2007, 06:01 PM
Which is what i'm trying to do, because I don't want to buy the clutch off you and realize that I need a new bellhousing because they're different sizes or something along the line. But if its just a flywheel I need i'll goto the wreakers or a shop and see if they have a single mass laying around I could buy.


Ok well I have a eta tranny and 325i flywheel. I seriously doubt they would make a different bellhousing to clear a dual mass flywheel, and even if they did a 325i one would be smaller and clear as is does in my car. If you take your starter out you should be able to tell what kind of flywheel it has. The single mass flywheel probably came on the super eta in 88. One thing I noticed on my car is you'll probably want to run the smaller 325i starter as it's designed to work with the 325i flywheel, the distance the gear shoots out is correct for where the teeth are on the flywheel. It works with a eta starter (larger style) but it might not line up exact. If you have an 87 you may already have the smaller style starter.

SamE30e
09-19-2007, 09:26 PM
So basically I need the clutch kit for a single mass, then just find a single mass flywheel and it should be good?

Ok heres my other question:
Who has a single mass flywheel kicking around I can buy off them?