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Author Topic: M20 flywheel conversion  (Read 12702 times)

gearheadE30

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M20 flywheel conversion
« Reply #15 on: May 03, 2007, 03:39:59 PM »
I would assume that you could, although bolts aren't super pricey and it may be a good idea to just replace them while you're in there.
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1989 Caprice Classic Wagon named Humphrey
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odbod

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M20 flywheel conversion
« Reply #16 on: May 03, 2007, 04:18:28 PM »
They are the same, M8 x 16mm.
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1991 E30 M42

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« Reply #17 on: May 03, 2007, 05:49:32 PM »
They're 12x1.5


No.   Description   Supplement    Qty    From      Up To    Part Number    Price   Notes
01   TWIN MASS FLYWHEEL      1         21211223550   $859.32   
   NOT SUITABLE FOR
TWIN MASS FLYWHEEL      
02   DOWEL PIN   10X23   3         11221709069   $3.24   
03   DOWEL   D=14,5MM   1         11111743118   $1.67   
04   COLLAR SCREW   M12X1,5X25   8         11221717841   $1.67   
   ONLY APPLIES TO
TWIN MASS FLYWHEEL      
04   HEX BOLT   M12X1,5X50   8         11222243051   $2.34   
05   GROOVED BALL BEARING   15X32X10   1   09/1990      11211720310   $20.76   

Notes:
« Last Edit: May 03, 2007, 05:53:10 PM by 1991 E30 M42 »
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1991 E30 M42

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« Reply #18 on: May 03, 2007, 10:29:12 PM »
Never mind, I was thinking about the wrong bolts.
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m44power

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M20 flywheel conversion
« Reply #19 on: May 04, 2007, 10:12:39 AM »
Quote from: kramerica5000;25094
Does anyone know if you can re-use the bolts from the m42 assembly to attach the M20 pressure plate to the M20 flywheel?

do your self a favor and change the presure plate bolts what would be good for the next time you want to remove your pressure plate as for the flywheel bolts (M20 bolts or machined m42 bolts 20mm long for 325i flywheel or 25mm long for Euro 320i flywheel) keep the same just use some Loctite
« Last Edit: May 04, 2007, 10:15:23 AM by m44power »
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Vladi

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M20 flywheel conversion
« Reply #20 on: May 06, 2007, 05:47:22 PM »
Quote from: odbod;25090
I have piccies comparing the IS, 325 and 323 T/O bearings if someone can host them I will post them up, they are quite different, you can see why you need the 323 bearing as it's quite a lot longer and the tabs are in different places.


How can we see the pics? I'm very curious!
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odbod

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M20 flywheel conversion
« Reply #21 on: May 11, 2007, 08:05:52 AM »
Throw out / Clutch release bearings from left to right

E21 etc 323      E30 318IS      E30 325i

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m44power

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M20 flywheel conversion
« Reply #22 on: May 11, 2007, 01:11:14 PM »
thats why my clutch release to high? :(
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romkasponka

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« Reply #23 on: May 11, 2007, 02:44:36 PM »
Quote from: m44power;25483
thats why my clutch release to high? :(


You can increase rod lenght on clutch cilinder...
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jpod999

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M20 flywheel conversion
« Reply #24 on: May 11, 2007, 05:44:14 PM »
Ok so someone that has done this needs to put together a list of all the parts they used to make it work.
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odbod

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« Reply #25 on: May 16, 2007, 03:35:31 PM »
Right here goes then...

Required:

1 off M20 325 Flywheel (the thin one) - Modified as below
1 off Starter motor to match the above (or pinion assy)
1 off clutch kit to suit the above
1 off Clutch release bearing (21511204525)
6 off Flywheel bolts - If you are being absolutely complete (11222243051)
6 off Clucth Bolts - M8x16mm long (07119919939) grade 8.8 (I Think) but you might as well fit 12.9 or 14.9 (as with the flywheel bolts you can re-use the originals)

Optional: - Might as well as they leak eventually...
1 off Clutch slave Cylinder
Brake/Clutch fluid

The flywheel has a lip on the engine side that may foul the engine and most have it machined off, it also gives the added bonus of lightening the flywheel!

I have included some piccies below for reference

M20 Engine side


M42 engine side


Flywheel on engine, not very clear but does show the lip has been machined back to the edge of the ring gear (and some extra has been taken out of the face)
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m44power

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« Reply #26 on: May 17, 2007, 11:54:20 AM »
Quote from: romkasponka;25489
You can increase rod lenght on clutch cilinder...

how ? :D
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romkasponka

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« Reply #27 on: May 17, 2007, 02:02:37 PM »
Quote from: m44power;25930
how ? :D


you can cut and weld it, or cut thread rod and make threaded sleeve..
« Last Edit: May 18, 2007, 07:42:52 AM by romkasponka »
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AL GReeNeRy

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M20 flywheel conversion
« Reply #28 on: May 18, 2007, 06:21:47 AM »
has anyone used a lightened flywheel with the m20 coversion? i like the fact that m20 lightweights are only 8 lbs compared to the m42s 9.  and the m20s is cheaper by about a hundred bucks!!!
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m44power

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M20 flywheel conversion
« Reply #29 on: May 19, 2007, 11:09:02 AM »
Quote from: romkasponka;25939
you can cut and weld it, or cut thread rod and make threaded sleeve..


can anyone mesure the different of 2 TOB for me ? how much longer is the E21 TOB ? just to know how much i have to add in my clutch cylinder
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