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Author Topic: 2.0l M42  (Read 59433 times)

KidneyBoy

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2.0l M42
« Reply #30 on: January 05, 2009, 12:53:47 PM »
Got the crank and s52 pistons. Now ive got to save up for other parts... ugh



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Froos

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2.0l M42
« Reply #31 on: January 05, 2009, 06:19:26 PM »
Out of which M47 engine comes your crank and why?
 
http://en.wikipedia.org/wiki/BMW_M47#M47TU2D20
 
I a way I already own this but it would leave my E87 useless, unless it takes a M42 crank...
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318i saloon base,lowered 40mm, alpinweiss2,535i rubbers,powerflex all round,6 for 6 goodridge, M3 caster rubbers, elec fan, carbon stud braces, CatCams, 8,4Kg flywheel ,ITB\'s, 3:73LSD

KidneyBoy

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2.0l M42
« Reply #32 on: January 05, 2009, 06:52:42 PM »
M47 with part number 11212247514

Its 88mm stroke. the crank stub is the propper length. the OD needs turned down and a new keyway needs put in at the correct location.
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Froos

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2.0l M42
« Reply #33 on: January 05, 2009, 07:09:16 PM »
Quote from: KidneyBoy;64186
M47 with part number 11212247514
 
Its 88mm stroke. the crank stub is the propper length. the OD needs turned down and a new keyway needs put in at the correct location.

excellent info!
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318i saloon base,lowered 40mm, alpinweiss2,535i rubbers,powerflex all round,6 for 6 goodridge, M3 caster rubbers, elec fan, carbon stud braces, CatCams, 8,4Kg flywheel ,ITB\'s, 3:73LSD

rob_e30

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2.0l M42
« Reply #34 on: January 05, 2009, 11:46:22 PM »
BTW, you'll need to get another woodruff key cut into the crank.
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Froos

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2.0l M42
« Reply #35 on: January 06, 2009, 08:51:17 AM »
What kind of revs are possible with the longer stroke? same as M42 STD with chip?
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318i saloon base,lowered 40mm, alpinweiss2,535i rubbers,powerflex all round,6 for 6 goodridge, M3 caster rubbers, elec fan, carbon stud braces, CatCams, 8,4Kg flywheel ,ITB\'s, 3:73LSD

swiss318is

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2.0l M42
« Reply #36 on: January 06, 2009, 03:41:27 PM »
man.. my local bmw dealer asks 1300$ for a new m47 crank! :eek:
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Froos

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2.0l M42
« Reply #37 on: January 07, 2009, 08:25:19 AM »
Can you still rev this setup to say 7500rpms with the much longer piston travel? Also how strong are the m3 pistons after cutting the deck by a couple of mm's?
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318i saloon base,lowered 40mm, alpinweiss2,535i rubbers,powerflex all round,6 for 6 goodridge, M3 caster rubbers, elec fan, carbon stud braces, CatCams, 8,4Kg flywheel ,ITB\'s, 3:73LSD

Bunta

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2.0l M42
« Reply #38 on: April 21, 2009, 08:52:27 PM »
Which rod and piston lengths/sizes would I want for a 8.5 CR motor?
Using a M47 crank? do these have stock bearing size?
Head gasket thickness?

Sorry to use your thread.  Cant wait to see the motor done.
M47 crank is the way to go.





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Ivan Petrov

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2.0l M42
« Reply #39 on: April 22, 2009, 03:29:14 AM »
What happens if you use M44 crank with M42B18 pistons?
« Last Edit: April 22, 2009, 03:34:19 AM by Ivan Petrov »
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hesgone2fast

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2.0l M42
« Reply #40 on: April 22, 2009, 03:49:10 AM »
Bunta, if you use S52 pistons(86,4mm) and M47 crank with 135mm rods(stock S52 rods), you shave the pistons to leave them 3mm below deck(you would have to shave about 1-2mm) you would end up with 2064cc, and 8,5:1CR.
Bearings have the same size between S52 and M42 and M47.
head gasket? stock M44 86mm bore.

Ivan petrov, you would have 1862cc, but you would need to shave the pistons, because M44 crank would leave the piston 1,5mm above deck, this would destroy the head, piston, rod, or all of them... you need to have the piston 0,15mm above deck maximum.with 0,15mm above deck, CR would be 10,3:1
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kowalski

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2.0l M42
« Reply #41 on: April 25, 2009, 01:28:01 AM »
which m47 crank are you talking about when your making your calculations?
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hesgone2fast

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2.0l M42
« Reply #42 on: April 26, 2009, 04:18:22 PM »
Quote from: kowalski;70708
which m47 crank are you talking about when your making your calculations?

Me? M47 88mm
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M42_Zach

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2.0l M42
« Reply #43 on: May 14, 2009, 02:09:52 PM »
Quote from: KidneyBoy;58987
Helps very much!

Option 1: 1929cc
M44 Crank
S50 Pistons

Option 2: 1947cc
M44 Crank
S52 Pistons

Option 3: 1997cc
M47 crank
M44 Pistons shaved 2.5mm


Are these calculations based on the M42 con rods?
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M42_Jester

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2.0l M42
« Reply #44 on: July 01, 2009, 07:45:51 AM »
Very interested in the thread...
keep me posted on ur progress KidneyBoy
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