S38B42 Up and Running Stroker - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #1 of 76 Old 13th December 2015, 12:16 AM Thread Starter
davidoli
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S38B42 Up and Running Stroker

After much R&D and a few hurdles the 4.2 stroker build is up and running .

She just has to be mapped and a few little extras and she's good to go .

It's been along time coming , but on the few short drives that I've had so far she feels like a highly spirited E34 M5 .

More details to follow , basic spec ;

95mm bore

98mm stroke

12:1 CR Pistons

H beam rods (147.5mm iirc )

Raceware Head Stud Kit

Mls head gasket

Bespoke Exhaust Manifolds

Bespoke Stainless Decat exhaust with x pipe

4.5kg Chromoly Billet Flywheel

Uprated Sachs Clutch

Larger alloy rad .

6 speed brakes .

Better a day as a tiger than a lifetime as a sheep !

91 Sebring 3.6 | E28 UK RHD M5 | E34 UK RHD 3.8 | E34 M5 Touring | E24 M635CSi UK RHD

www.classicmdautos.co.uk
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post #2 of 76 Old 13th December 2015, 01:11 AM
AseanAero
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Great to hear some news on this project David

Have you calculated the dynamic compression ratio and what fuel will you be using ?

Depending on cam timing the DCR will be high with 12:1 CR and a longer stroke

Any ping problems ?

This should be conservatively a 390 to 400hp motor by my calcs with more available with software changes, 315 to 320 RWHP

It Will be good to get some knowledgable comments on this stroker conversion from someone dong it and not theory

Mid range torque should be awesome
.



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324


1995 E34 540/5 Project

Last edited by AseanAero; 13th December 2015 at 05:30 AM.
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post #3 of 76 Old 13th December 2015, 08:34 AM
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David,,,, is this the OZ ppf stroker kit ??

Sveinbjörn Hrafnsson

E30 CABRIO V12 M70B50 ///
ALPINA B10 BITURBO 346 @ 507
E34 550 V12 JML

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post #4 of 76 Old 13th December 2015, 09:17 AM Thread Starter
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Hi guys .

Yes , this is the Aussie PPF Kit after a number of discoveries and alterations to get it up and running .

In the uk there are only a few petrol stations that sell >97 ron fuel .

Ideally we want to run on the highest octane available and at present it's got 99 ron fuel in the tank .

My man is currently looking at the fuelling and will be mapping her after a run on the rollers.

For now , I am simply overjoyed to have her up and running and getting her through a uk ministry of transport test , including emissions test .

See video of initial running ;
E34 M5 S38B42 Stroker:

http://youtu.be/xNfBPVQOpPg

Better a day as a tiger than a lifetime as a sheep !

91 Sebring 3.6 | E28 UK RHD M5 | E34 UK RHD 3.8 | E34 M5 Touring | E24 M635CSi UK RHD

www.classicmdautos.co.uk
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post #5 of 76 Old 13th December 2015, 01:33 PM
AseanAero
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David ,

Stock , Shrick or custom cams ?

Some calculations on water / methanol injection

http://www.aquamist.co.uk/vbulletin/...read.php?t=294



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324


1995 E34 540/5 Project

Last edited by AseanAero; 14th December 2015 at 12:56 AM.
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post #6 of 76 Old 14th December 2015, 09:24 AM
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post #7 of 76 Old 14th December 2015, 10:04 AM
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Amazing project David. Keep us posted.

It is said that if you line up all the cars in the world end to end, someone would be stupid enough to try and pass them.
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post #8 of 76 Old 14th December 2015, 10:14 AM
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Quote:
After much R&D and a few hurdles the 4.2 stroker build is up and running .
Any more info on this David ?

This is not a plug and play stroker kit ?



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324


1995 E34 540/5 Project
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post #9 of 76 Old 14th December 2015, 07:46 PM
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Quote:
Originally Posted by AseanAero View Post
Any more info on this David ?

This is not a plug and play stroker kit ?
Why not... new crank and rod+pistons... and the block rebored

Sveinbjörn Hrafnsson

E30 CABRIO V12 M70B50 ///
ALPINA B10 BITURBO 346 @ 507
E34 550 V12 JML

http://alpina.123.is/pictures/
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post #10 of 76 Old 15th December 2015, 12:46 AM
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Quote:
Originally Posted by Ferrari-Bmw View Post
Why not... new crank and rod+pistons... and the block rebored
David said "After much R&D and a few hurdles the 4.2 stroker build is up and running ."

"Much R+D and a few hurdles" doesn't sound like it was an easy bolt in

What I want to know is this crank , rod and piston related or other engine components



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
GA25324


1995 E34 540/5 Project
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