Author Topic: M42 single mass VS M20 single mass conversion (Read 97690 times)

dude8383 · « **Reply #75 on:** April 27, 2011, 06:25:01 PM »

Quote from: sbarton;103306

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

Scott, you'd be okay with the stock 325i TOB as well. I'm running this exact setup on my white 318i and haven't had a single problem.

cristimm · « **Reply #76 on:** May 20, 2011, 06:13:01 AM »

Quote from: DesktopDave;101942

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

It's very common. I estimate about 50% of the IS'es in europe do not have A/C and do have the single mass flywheel.

PumpItUp · « **Reply #77 on:** June 02, 2011, 06:22:18 AM »

I'm about to try this conversion. But where does the spacer go? The one that is on the m42 dual-mass flywheel which you take off by drilling through the rivets.. and then using on the m20 single mass setup.

Also, what transmission oil does everyone recommend again? :-)

NisseJ�rnet · « **Reply #78 on:** June 11, 2011, 07:12:13 AM »

Quote from: PumpItUp;104290

I'm about to try this conversion. But where does the spacer go? The one that is on the m42 dual-mass flywheel which you take off by drilling through the rivets.. and then using on the m20 single mass setup.

Also, what transmission oil does everyone recommend again? :-)

Easiest way:

M20 flywheel, mill down the engine side of the flywheel a bit to get clearence for oil pan
M20 starter
M20 flywheel bolts (dont forget the big spacer between the flywheel and bolts!)
M20 clutch

Done! (works 100% on single mass M42, not sure about dual mass)

stillmatick · « **Reply #79 on:** June 11, 2011, 11:00:58 AM »

so much work to convert to single mass,rather just keep my dual mass.

DesktopDave · « **Reply #80 on:** June 11, 2011, 01:19:34 PM »

The flywheel x-ref at RealOEM only includes one USA model...the early 318is until 3/90. Here's the diagram. Though it's likely a dealer-only item and smaller than the M20 unit, it's plug & play. I have no need for the larger 228mm clutch though.

So I've been thinking about doing it with the M40 parts myself. From what I've seen, the correct parts are:
21 21 1 223 569 (refurb clutch assembly - Pelican lists it for $138 before shipping & 20% BMW overseas order fees)
Here's a LUK kit for $104.
11 22 1 739 315 (single mass flywheel - Pelican lists that for $404. I'd get it used, definitely)

Looks like Valeo finally released their dual-->single mass conversion kit too. $739 is pretty steep, but it has all the goodies. Google "DMF Conversion Kit" & you'll see if it's a good fit for you. I've seen it for less, apparently it's the same kit for the M44 & M52 in the e36 & Z3. Still, that's like what my car is worth...it's a tough decision. :rolleyes:

Needs short bolts too, and I'm not sure if the M43 fork, anti-rattle spring & TOB are the right ones though since they fit the e36 transmission. The M40/M42/M43 with a single-mass flywheel was installed in all kinds of cars. I'm thinking it should be pretty easy to come by.

PumpItUp · « **Reply #81 on:** June 15, 2011, 03:57:33 AM »

Why would you get that Valeo junk kit for $739!? That's made for profiting off people about to buy a NEW OE dual-mass flywheel replacement, and figure this kit will save them some money.

Used e21 323i or e30 325i m20 flywheel = $10-100 used
87-91 325i starter used from junkyard = $30 ish or rebuilt for ~ $100

From 325i/is/ic (1987-91)
Pressure Plate, w/o dual-mass flywheel = $82

Clutch Disc, 228mm, w/o dual-mass flywheel = $107

Throw-out bearing from a 318i (1984-85), 318i/is/iC (1991), 325/e/es/i/is/iC/iX (1984-91), M3 (1987-91)
http://www.pelicanparts.com/cgi-bin/smart/more_info.cgi?pn=21-51-7-521-471-M38&catalog_description=Throw%20Out-Bearing%2C%20318i%20%281984-85%29%2C%20318i%2Fis%2FiC%20%281991%29%2C%20325%2Fe%2Fes%2Fi%2Fis%2FiC%2FiX%20%281984-91%29%2C%20M3%20%281987-91%29 or a e21 323i = $43 vs $71

or just get the clutch kit = $240

Plus the bolts, etc..
By the way, http://www.pelicanparts.com/cgi-bin/smart/more_info.cgi?pn=11-22-1-739-315-BOE&catalog_description=Flywheel%2C%20E30%20318i%2Fis%2Fic%20%281990-91%20Only%29%20For%20cars%20without%20Dual%20Mass%20Flywheel
"Quantity in Stock: 1"

DesktopDave · « **Reply #82 on:** June 15, 2011, 09:40:10 AM »

IDK if I'd call Valeo "junk." I've used they're stuff on occasion, seems well enough made. They're economical, though not up to the reputation of first class suppliers like Sachs/Bosch/Hella/etc. I'm sure that could be found for less $$$ too. I thought the dual-mass was a LuK-designed product? I don't trust them yet.

I'm thinking this is a really good choice if you'd prefer that your mechanic installs it. Clutch swaps aren't for everybody...It's a bolt-in kit, all new parts, with a warranty to boot. Any reputable mechanic or dealer will put it in right the first time & likely stand behind their work.

That link you sent made me start thinking though...(never a good thing)...if the e28's use the same TOB, I'll bet the whole clutch would be similar. Sure the e30's are more common, but if an e28 was a one-stop-shop for all the parts that might be even cheaper!

***edit*** remove that thought. A new e28 flywheel by itself at Pelican is $840. Ouch. Looks like it's mostly the same as an early e30 M20 eta setup.

stillmatick · « **Reply #83 on:** June 16, 2011, 06:50:51 AM »

i rather use Valeo "junk instead of conversion thing. gotta pay to play you know what im saying mannnnggg.

PumpItUp · « **Reply #84 on:** June 25, 2011, 04:19:28 AM »

I didn't mean Valeo is junk, just that kit :-)

You can get a brand new aluminium flywheel from JBR, Ireland Racing, etc for the m42 or m20 for $400-650. Sachs clutch kit is $200-240. That's almost the same total price as Valeo but much lighter. Or you could order an OE single-mass m42 flywheel for $400 (special order from Germany).

lqbanotxano · « **Reply #85 on:** September 16, 2011, 06:26:39 PM »

Does one have to ballance the flewheel after lightning it? Do flywheels come ballanced from the factory?

romkasponka · « **Reply #86 on:** September 17, 2011, 03:15:09 PM »

Quote from: lqbanotxano;106716

Does one have to ballance the flewheel after lightning it? Do flywheels come ballanced from the factory?

Yes, they must be balaced and comes from factory balanced.

PumpItUp · « **Reply #87 on:** September 24, 2011, 10:25:20 PM »

I regret using e21 323 throw-out bearing on this conversion. Should of used 318/325 e30, saved ~$30 and had longer engagement which I like. Now if I put my foot on the clutch pedal while driving I burn the clutch.

dude8383 · « **Reply #88 on:** September 26, 2011, 04:34:49 PM »

Why you would be riding the clutch pedal anyway? You're only really supposed to have your foot there for shifting...

Balkanac · « **Reply #89 on:** May 30, 2012, 08:52:51 PM »

i have done a similar thing, got an m40 flywheel and an m40 clutch kit, everything fitted fine. can you guys get an m40 flywheel over there? I think the non air con m42s in US came with a single mass flywheel