Author Topic: M42 single mass VS M20 single mass conversion (Read 97646 times)

cristimm · « **Reply #60 on:** January 18, 2011, 03:01:18 PM »

Quote from: peerless;49921

M42 single mass advantages:

Lighter weight over the dual mass unit and just as light as the M20 conversion.
Use factory M42 starter with no modifications
Use factory clutch kit complete
Uses factory length flywheel bolts
All parts readily available.

Disadvantage:
Cost involved in acquiring single mass flywheel
====================================

Are you sure that the M42 single mass uses the same length flywheel bolts?
http://www.realoem.com/bmw/showparts.do?model=BE51&mospid=47425&btnr=11_1151&hg=11&fg=20

realoem shows 2 lengths 25 and 50mm

In other words: are the M42 single mass flywheel and clutch kit the only needed parts for the swap?

I am interested in this setup because in europe it is not a problem finding the M42 single mass at junk yards.

colin86325 · « **Reply #61 on:** January 27, 2011, 12:08:23 PM »

The single mass flywheel uses shorter flywheel bolts.

SimplyDope · « **Reply #62 on:** March 02, 2011, 12:43:04 PM »

Was just quoted $600 for the DynoTech kit if anyone was still interested in that. Looks like a good kit, and the price seems to climb up every month. Still look like it's worth it to you guys? I'm hard-pressed for time these days, and as much as I'd enjoy the search to piece everything together on the cheap, it's near impossible, so I'm thinking of going for this kit. Opinions or suggestions?

DesktopDave · « **Reply #63 on:** March 02, 2011, 04:13:20 PM »

Quote from: cristimm;100659

I am interested in this setup because in europe it is not a problem finding the M42 single mass at junk yards.

How common are the M42 single mass flywheels? I'm thinking that this is the best option, even though it's smaller in diameter.

Hey-u · « **Reply #64 on:** March 02, 2011, 04:59:38 PM »

Quote from: SimplyDope;101935

Was just quoted $600 for the DynoTech kit if anyone was still interested in that. Looks like a good kit, and the price seems to climb up every month. Still look like it's worth it to you guys? I'm hard-pressed for time these days, and as much as I'd enjoy the search to piece everything together on the cheap, it's near impossible, so I'm thinking of going for this kit. Opinions or suggestions?

What clutch are they quoting?

PumpItUp · « **Reply #65 on:** March 03, 2011, 02:45:14 AM »

i badly need a clutch too!

a year or two ago i wanted to get (e21) 323i flywheel as someone else on here did. but what clutch kit do I need with that, 323 or m20 (325i)

and would a 325i starter still work with that. i'm confused as hell :confused:
pelican parts catalog is further confusing me. i won't shop there again but they had reliable info..

harvey2 · « **Reply #66 on:** March 03, 2011, 12:06:48 PM »

Quote from: PumpItUp;101955

i badly need a clutch too!

a year or two ago i wanted to get (e21) 323i flywheel as someone else on here did. but what clutch kit do I need with that, 323 or m20 (325i)

and would a 325i starter still work with that. i'm confused as hell :confused:
pelican parts catalog is further confusing me. i won't shop there again but they had reliable info..

Yes indeed, it is very confusing. My experience is that for the E21 323i flywheel (which is what I used) the M20 clutch kit is a perfect fit. See my list of part numbers in post #42 of this thread for details.

I also used a starter from a 325i, in fact a 325ix, and it fit correctly.

SimplyDope · « **Reply #67 on:** March 04, 2011, 02:05:55 AM »

Quote from: Hey-u;101943

What clutch are they quoting?

It's the OEM Sachs M20 clutch with the rest of the bits above.

Hey-u · « **Reply #68 on:** March 13, 2011, 06:04:35 PM »

Quote from: SimplyDope;101997

It's the OEM Sachs M20 clutch with the rest of the bits above.

Thanks!

sbarton · « **Reply #69 on:** April 23, 2011, 08:27:50 AM »

http://store.bimmerworld.com/e30-325i-lightweight-flywheelperformance-clutch-kit-p1071.aspx

Would the BimmerWorld E30 325i JB Lightweight flywheel and Clutchmasters clutch work? It's $750 for both. How much lighter is the JB lightweight flywheel?

-Scott

sbarton · « **Reply #70 on:** April 25, 2011, 09:03:18 AM »

Quote from: Bracky;89279

Is this in reference to a E30 323i or E21 & I'm guessing either way its still the same 323i TOB? As for the clutch does it have to be for a 323 or could a 325 clutch be used as im guessing the 323i has single mass where as the 325 has dual so clutchs would not be interchangeable?

I cannot find any reference to a E21 or E30 323i at Pelican or RockAuto. Does anyone have the part number for the lighter 323i flywheel? Is it available in the states?

-Scott

sbarton · « **Reply #71 on:** April 25, 2011, 09:15:15 AM »

For some reason I cannot find any reference to a E21 or E30 323i. Does anyone know the part number is for the 323i flywheel? Or better yet, a link to one I can buy in the US.

-Scott

kokos123 · « **Reply #72 on:** April 27, 2011, 03:22:36 PM »

Hi,
I have a spare M40 single-mass flywheel & clutch set (from my previous broken-down engine). Currently I run a M42 and I don't know what type of flywheel is in. Since they differ by only 2kg I want to lighten it anyway. Following bmwfans.info M42 single-mass FW is the same as M40's. According to this topic, If I find dual-mass in my car I should be able to fit lightened M40's FW right away. Am I right? Is it safe to go ~40% lighter in BMW?

mr.vang · « **Reply #73 on:** April 27, 2011, 03:42:08 PM »

great info..

DesktopDave · « **Reply #74 on:** April 27, 2011, 05:36:02 PM »

Here's a pair of cheap M40 single mass used clutches for sale right now. Post might be expensive over the pond, the TOBs seem AWOL and I'm not too sure of condition.