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-   -   S38B42 Up and Running Stroker (https://www.m5board.com/vbulletin/e34-m5-discussion/494009-s38b42-up-running-stroker.html)

davidoli 13th December 2015 12:16 AM

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 .

AseanAero 13th December 2015 01:11 AM

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
.

Ferrari-Bmw 13th December 2015 08:34 AM

David,,,, is this the OZ ppf stroker kit ??

davidoli 13th December 2015 09:17 AM

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

AseanAero 13th December 2015 01:33 PM

David ,

Stock , Shrick or custom cams ?

Some calculations on water / methanol injection

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

MattH 14th December 2015 09:24 AM

Great stuff David - you must have lots of pics - get them up here !

BlueBiturbo 14th December 2015 10:04 AM

Amazing project David. Keep us posted.

AseanAero 14th December 2015 10:14 AM

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 ?

Ferrari-Bmw 14th December 2015 07:46 PM

Quote:

Originally Posted by AseanAero (Post 6347137)
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

AseanAero 15th December 2015 12:46 AM

Quote:

Originally Posted by Ferrari-Bmw (Post 6347769)
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


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