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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E30 (1982 - 1993)

E30 (1982 - 1993)
God's Chariot. The E30 was produced primarily from 1982 through 1991. The cabriolet was the one exception which was produced through 1993.

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  #1  
Old 02-14-2015, 01:24 AM
xMAUIxxWOWIEx xMAUIxxWOWIEx is offline
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Mein Auto: 1986 BMW 325es
Question 1986 325es Single or Dual mass flywheel?

1986 325es 2.7L M20B27
5 speed transmission

Hey everyone, I am currently working on my first E30 build and I am fairly new
to working on cars. Pretty much been teaching myself as I go... I was looking to
purchase a lightweight flywheel but I am unsure if my vehicle requires a
single mass or dual mass flywheel? Are there any identifying features on the
flywheel that I could look for? Are they interchangable? I plan on swapping to
a stage 2 clutch also from turbochargingdynamics... Thanks!
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  #2  
Old 02-14-2015, 02:49 AM
u3b3rg33k u3b3rg33k is online now
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Mein Auto: e30, e60, R1100S
Not sure about the eta, but your ECU may require the timing pins on the flywheel, so that's important.

what are you building with that eta motor?
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e30: '87 325i: MAF+WAR chip, long tube STAHL headers, 5MT swap, 4.27 torsen
e60: '08 550i M-sport, 6MT, ARC, Active Steering, 19" wheel delete
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  #3  
Old 02-14-2015, 03:11 AM
xMAUIxxWOWIEx xMAUIxxWOWIEx is offline
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Mein Auto: 1986 BMW 325es
I am currently working on upgrading all aspects of the worn out motor
that was in the car when I bought her. She needs alot of work! I plan on using this
car as my first ever boost project also. Like I said I am new to the car scene but I
have a few friends that have been guiding me through my first build....
I am about to send the block to Bimmerheads for the following parts & assembly
Bimmerheads super sport head,
Ross pistons
S52 rods
M52B28 crank
ARP Head studs & rod bolt kit
New bearings, belts, gaskets
water pump, oil pump ect.
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  #4  
Old 02-14-2015, 11:07 AM
u3b3rg33k u3b3rg33k is online now
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Mein Auto: e30, e60, R1100S
a single mass flywheel would be lighter than a dual mass, but if you're starting with an eta, you may not be able to use it unless you upgrade the electronics due to the flywheel based pickup.
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e30: '87 325i: MAF+WAR chip, long tube STAHL headers, 5MT swap, 4.27 torsen
e60: '08 550i M-sport, 6MT, ARC, Active Steering, 19" wheel delete
R1100S - oilhead FTW

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  #5  
Old 02-14-2015, 10:56 PM
xMAUIxxWOWIEx xMAUIxxWOWIEx is offline
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Mein Auto: 1986 BMW 325es
So the 86 325es comes stock with a dual mass?
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  #6  
Old 02-14-2015, 11:39 PM
xMAUIxxWOWIEx xMAUIxxWOWIEx is offline
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Mein Auto: 1986 BMW 325es
Quote:
Originally Posted by xMAUIxxWOWIEx View Post
So the 86 325es comes stock with a dual mass?
After some more research I have discovered the answer to my question! The 86 models
had been produced with single mass until a certain point they changed over to the dual mass.... I have compared the pictures of mine to other flywheels and I believe it is in fact
a single mass flywheel... WOOT!
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  #7  
Old 02-15-2015, 06:17 PM
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downhiller downhiller is offline
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or you can get a new lightweight flywheel and help the engine spool faster
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Old 02-15-2015, 07:22 PM
u3b3rg33k u3b3rg33k is online now
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Quote:
Originally Posted by downhiller View Post
or you can get a new lightweight flywheel and help the engine spool faster
or lighten the existing one for cheaper. unless it's damaged it's reusable.
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e30: '87 325i: MAF+WAR chip, long tube STAHL headers, 5MT swap, 4.27 torsen
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R1100S - oilhead FTW

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  #9  
Old 02-16-2015, 09:14 PM
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downhiller downhiller is offline
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can you do that to the dual mass? i forgot
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Old 02-16-2015, 09:39 PM
u3b3rg33k u3b3rg33k is online now
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I honestly don't know, but i'm leaning towards "not easily".
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e30: '87 325i: MAF+WAR chip, long tube STAHL headers, 5MT swap, 4.27 torsen
e60: '08 550i M-sport, 6MT, ARC, Active Steering, 19" wheel delete
R1100S - oilhead FTW

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  #11  
Old 02-17-2015, 05:41 AM
xMAUIxxWOWIEx xMAUIxxWOWIEx is offline
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Mein Auto: 1986 BMW 325es
I will most likely just purchase a single mass lightweight flywheel. Turnermotorsports does carry a single and dual mass version of the lightweight flywheels for the etas... I was just having a hard time wrapping my head around the difference initially. I'm pretty new to the auto mechanics work. Put an airplane in front of me and I can teach ya some stuff though haha.
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Old 02-17-2015, 08:45 AM
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i believe the dual mass has a heavier weight material on the outer portion to help the motor run smoother since its a lower revving motor. at least thats what would make sense to me.
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  #13  
Old 02-26-2015, 05:16 AM
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Nick323 Nick323 is offline
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Mein Auto: 323i E30 2-door
Question Dual mass to single mass conversion

Generally dual mass FW's are heavier by a considerable margin
Due to the price of clutch replacement (FW is part of the clutch mechanism) on dual mass I have them converted to single mass with all the neccesary indexing features on a lot of light trucks.

This makes the motor spool faster and it can use a ceramic plate. Future clutch replacement is cheap
Now before you make up your own FW, beware : It cannot be made from normal steel as this would causee premature wear. My ceramic friction material is designed to work best with automotive grade cast iron at best or at worst a steel with a carbon content of not less than 20 to 30% !

Talking BMW it seems that all older FW assembly's are 0-balanced and share the same bolt dia and pattern as well as ring-gear, so you can mix and match provided you also take care of timing pins etc..
For instance it seems that my M52 motor has a dual mass FW which can be replaced with a much lighter M20 FW
This way I can build a stronger & lighter assembly
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