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Old 10-11-2007, 11:29 AM   #1
MANDD
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E30 M20B25 Dual Mass Flywheel

Looking for a Flywheel for a E30 M20B25.

Thanks.
Mark
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Old 10-11-2007, 12:41 PM   #2
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m20b25 would be an i - aren't they all single mass?
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Old 10-11-2007, 11:22 PM   #3
craz azn
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^^ see thats what I thought too, but apparently I'm told some 325e's come with dual mass flywheels! Pretty wack if you think about it. I could see the 318iS M42 having one since its a newer design, but the 2.7e?

And no the m20b25 should have a single mass.
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Old 10-12-2007, 09:42 AM   #4
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Originally Posted by craz azn View Post
^^ see thats what I thought too, but apparently I'm told some 325e's come with dual mass flywheels! Pretty wack if you think about it. I could see the 318iS M42 having one since its a newer design, but the 2.7e?

And no the m20b25 should have a single mass.
Most eta's I've seen have dual mass flywheels - I believe the exception is some early 1984 / 1985 models which came with the Getrag 260. In short if MANDD wants a dual mass flywheel for an m20 he should be looking at m20b27's and not m20b25's.
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Old 10-12-2007, 09:49 AM   #5
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Don't know why anyone would want a dual mass.
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Old 10-13-2007, 01:11 AM   #6
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^true

Nick, thanks for clearing that up. Which cars came with the ZF transmission anyways? Never actually came across one to tell ya the truth. All of my cars (parts and whatever else etc) had Getrag 260s
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Old 10-13-2007, 06:03 PM   #7
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^true

Nick, thanks for clearing that up. Which cars came with the ZF transmission anyways? Never actually came across one to tell ya the truth. All of my cars (parts and whatever else etc) had Getrag 260s
The only ZF's that I know of with m20's were the auto's. The early Getrag 260's I was talking about were the 2 piece bellhousing / big 6 Getrag 260.
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Old 10-13-2007, 07:17 PM   #8
MANDD
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M20B25 is the the 2.5L engine up to late 91', this motor is equiped with a Twin mass flywheel.


I have located one, thanks to all that replied.

Mark.
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Old 10-14-2007, 07:32 PM   #9
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Originally Posted by MANDD View Post
M20B25 is the the 2.5L engine up to late 91', this motor is equiped with a Twin mass flywheel.


I have located one, thanks to all that replied.

Mark.
I still bet you its from an eta - if you take a picture of it I might be able to prove it to you
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Old 10-15-2007, 01:20 AM   #10
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Nick, that would be the 265 that is two piece. I've never seen one of those yet, heard of it though.
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Old 10-15-2007, 08:24 AM   #11
MANDD
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I still bet you its from an eta - if you take a picture of it I might be able to prove it to you



Thanks, but I have been with BMW for 15 Years, it is a Dual Mass flywheel. I have dissasembled these units many times for Quality Control. We also pulled units from late 86'/87' onwards to review reliability.

The units rarely fail, unless used in the wrong application

As a Master BMW technician I got involved alot with quality control.

It is made up of the following parts;
Stop pin
Primary Flywheel
Damping Chambers
Inner plates
Plastic guide of Damper springs
Springs for drive stage
Springs for stop stage
Starter gear ring
Secondary flywheel

The primary flywheel is fitted directly to the crank, then the secondary flywheel is fitted on the primary by a single row bearing. Both masses are then connected by the two stage spring system.

Damping is achieved by using a viscous grease that is forced into all available gaps by the motion between the primary and secondary flywheel which produces a constant damping effect.

The design is quite brilliant, however not so effective with high horsepower applications unless modified to accept the greater torsional load.

Thanks,
Mark.
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Old 10-15-2007, 08:58 AM   #12
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Originally Posted by MANDD View Post
Thanks, but I have been with BMW for 15 Years, it is a Dual Mass flywheel. I have dissasembled these units many times for Quality Control. We also pulled units from late 86'/87' onwards to review reliability.

The units rarely fail, unless used in the wrong application

As a Master BMW technician I got involved alot with quality control.

It is made up of the following parts;
Stop pin
Primary Flywheel
Damping Chambers
Inner plates
Plastic guide of Damper springs
Springs for drive stage
Springs for stop stage
Starter gear ring
Secondary flywheel

The primary flywheel is fitted directly to the crank, then the secondary flywheel is fitted on the primary by a single row bearing. Both masses are then connected by the two stage spring system.

Damping is achieved by using a viscous grease that is forced into all available gaps by the motion between the primary and secondary flywheel which produces a constant damping effect.

The design is quite brilliant, however not so effective with high horsepower applications unless modified to accept the greater torsional load.

Thanks,
Mark.
I'm sure its a dual mass, I'm also sure it fits your m20b25 I just think its from an m20b27. Outside of the dowel pin used for the pressure plate is there another dowel / pin?
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Old 10-15-2007, 09:10 AM   #13
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Nick, that would be the 265 that is two piece. I've never seen one of those yet, heard of it though.
Wasn't the 265 the e30 m3 tranny? I thought the regular m30's used 260/5 and 260/6
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Old 10-15-2007, 09:38 AM   #14
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Mark, I think what they guys are trying to say is that all m20b25s (325i's) we've seen all came with single mass flywheels.

The only m20's that came with dual mass ones were m20b27s (325e), but there was a switch at somepoint from the dual to single mass flywheels.

and the fact that the 325i your working on came with a dual mass flywheel, leads us either to believe it is an oddball rarity, or someone switch the flywheel from a 325e into it.

The single mass flywheel i showed you was from a 86 325e i believe, which is similar (minor differences) to the 325i single mass flywheel and because of the popularity of lightening m20 flywheels, the single mass wheels are more desirable and often swapped out to replaced dual mass ones.
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Old 10-15-2007, 01:59 PM   #15
dgmorr
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I didn't pull the single mass flywheel off my M20B25 parts motor for nothing.

That dual-mass is from an M20B27.
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