headgasket for 86/86.5mm pistons?
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Author Topic: headgasket for 86/86.5mm pistons?  (Read 20309 times)

Freak

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Re: headgasket for 86/86.5mm pistons?
« Reply #30 on: November 09, 2013, 07:47:11 AM »
Quote from: thebrelon on November 07, 2013, 02:07:47 PM
interesting... do you have any experience with such a setup?

what kind of power/torque should be expected with this setup and mild cams (between 260 and 280°) with E85 and MS3X standalone? 150hp at the wheels?
Nope, I don't have. My engine is still under construction and I found that piston setup after I bought M52B28 pistons. I decided to use them. Maybe next time...
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thebrelon

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Re: headgasket for 86/86.5mm pistons?
« Reply #31 on: December 30, 2013, 02:42:21 AM »
do you guys confirm that M44 rods are lighter than M42's?
I can have a set of M44 rods for a good price and I would like to be sure they are ligther first. that would be my first step torward a high CR M42...
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Vince
'91 318is 230000km stock

benz-tech

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Re: headgasket for 86/86.5mm pistons?
« Reply #32 on: December 30, 2013, 11:36:56 PM »
They are. I scrapped an m42 a while back and those rods are quite heavy. M44 rods are essentially longer s50 M3 rods. I read 100 grams lighter and even though I didn't weigh them I believe it.
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thebrelon

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Re: headgasket for 86/86.5mm pistons?
« Reply #33 on: December 31, 2013, 02:00:18 AM »
thank you!
they must be the same as one of the M50s and you shouldn't be far away from truth with 100g from what I've read.
next is a set of M52B28's pistons for the same kind of build as you, the stroke apart...
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Vince
'91 318is 230000km stock

colin86325

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Re: headgasket for 86/86.5mm pistons?
« Reply #34 on: December 31, 2013, 06:51:21 AM »
It looks like the M42 rods have been superseded with 11 24 1 437 617 (I think this is the M44 rod). 
This part is listed for the M40, M42, M43, M44 engines.
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thebrelon

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Re: headgasket for 86/86.5mm pistons?
« Reply #35 on: January 01, 2014, 02:36:25 AM »
good to know! thank you colin.
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Vince
'91 318is 230000km stock

MrPhatBob

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Re: headgasket for 86/86.5mm pistons?
« Reply #36 on: January 07, 2014, 06:26:54 AM »
I weighed a rod from my late (Z3) M42 block - it came in at 547.1gm.  This is around the same weight at the Eagle H beam rod (as stated by Eagle).

The Cometic head gasket part number for the 87mm bore is H2197SP2040S, I've been advised to use a marginally larger gasket than the bore hence the 87mm gasket for an intended 86.5mm overbore.
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thebrelon

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Re: headgasket for 86/86.5mm pistons?
« Reply #37 on: January 07, 2014, 07:28:44 AM »
thanks for all the details!
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Vince
'91 318is 230000km stock

jrw21

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Re: headgasket for 86/86.5mm pistons?
« Reply #38 on: January 07, 2014, 07:58:28 AM »
FYI if you are still looking for a gasket. I spoke with Mike at VAC motorsports yesterday and they can make an MLS 86.5mm m42 gasket. Or any custom bore for that matter.
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thebrelon

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Re: headgasket for 86/86.5mm pistons?
« Reply #39 on: January 08, 2014, 02:34:23 AM »
actually I gave up the stroker idea so for financial reasons, the latest project is M44 rods and M52B28 pistons to build a cheap high CR NA M42.

but! that's still good to know, either for anybody who would want to stroke his M42, or in case of yet another project change... ;-)
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Vince
'91 318is 230000km stock
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