S38B42 Up and Running Stroker - Page 4 - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #31 of 76 Old 21st December 2015, 01:16 AM
AseanAero
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Correct , the intake valve is now closing at around 94 deg ABDC compared to the stock cam at 70 deg ABDC causing less cylinder pressure.

Engine is going to be lumpy as hell and a bit of a pig at low rpm



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
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post #32 of 76 Old 21st December 2015, 01:54 AM
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davidoli; your engine is magnificence. It's truly over -the-edge, in the very best way. Where others just blow in it, you've taken the S38 to its highest form, in the way we all love. Thank you, and please, forever know that you're the best!

And I'm fine with blowing in it, too. done by the right guy....with as much love as davidoli has!

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post #33 of 76 Old 21st December 2015, 04:01 AM
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So... If I want to make the same 4.2 stroker but with a normal 10:1 or 10.5:1 compression ratio, what cam shoud be enough ? I will use mainly 94 octane fuel. Thanks.

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 #34 of 76 Old 21st December 2015, 10:39 AM
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Quote:
Originally Posted by BlueBiturbo View Post
So... If I want to make the same 4.2 stroker but with a normal 10:1 or 10.5:1 compression ratio, what cam shoud be enough ? I will use mainly 94 octane fuel. Thanks.
I need to run the numbers but I suspect it will be 284 deg cams



Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
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post #35 of 76 Old 21st December 2015, 03:43 PM
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Originally Posted by BlueBiturbo View Post
So... If I want to make the same 4.2 stroker but with a normal 10:1 or 10.5:1 compression ratio, what cam shoud be enough ? I will use mainly 94 octane fuel. Thanks.
Taffy , B42 stroker should be ok with stock cams and 10.5:1

If you wanted a bit more safety margin go with some Shrick 284 cams
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1990 E34 M5 S38B36 GA25324
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post #36 of 76 Old 22nd December 2015, 10:35 AM
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Quote:
Originally Posted by AseanAero View Post
Correct , the intake valve is now closing at around 94 deg ABDC compared to the stock cam at 70 deg ABDC causing less cylinder pressure.
I do not understand how you come to 94 °. I calculate the 291 ° Cat Cam at 110 ° lobe angel with timing 75.5° / 35.5°
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post #37 of 76 Old 23rd December 2015, 12:12 PM
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I do not understand how you come to 94 °. I calculate the 291 ° Cat Cam at 110 ° lobe angel with timing 75.5° / 35.5°
Me too , you are correct 75.5 deg ABDC

Putting the correct ABDC into the wallace racing DCR calculator means David's S38B42 will need 98 to 100 octane fuel (DCR approaching 9)


.
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Tony, Aussie expat in Jakarta Indonesia

1990 E34 M5 S38B36 GA25324
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1995 E34 540/5 Project

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post #38 of 76 Old 23rd December 2015, 08:56 PM
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post #39 of 76 Old 24th December 2015, 08:44 AM
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Just WOW !!!

Waiting impatiently for pics AND video ...

SOLD: 1991 E34 M5 3.6 (e38 M Parallel's + Chip + deCat + Iridium spark-plugs + Xenon)
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post #40 of 76 Old 26th December 2015, 10:13 PM
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Sounds orsome David. The 291cam will feed the high 12:1 comp nicely. The cam is still low in valve lift so it's not too crazy. I actually like the lopey idle.

Did I hear correct that you are using a remapped OEM computer?
This engine could be massively enhanced with a good off the shelf engine managment computer. Firstly sequential injection could tone down the idle significantly and with the high comp if you run it with the aid of a wideband exhaust sensor you could get better than factory cruise fuel economy out of it and still make well over 400bhp depending on how high u are prepared to rev the long stroke engine.

Orsome work for having the balls to build this.

I'm doing a s38 rebuild shortly. Have 13:1 ppm pistons, all new timing chain components haltech computer. Just deciding how big I want the cam and whether it will be e85 only or drop the comp to mid 12's and have the ability to run Ron98. It's going in my m635csi. I'm taking out the m88/3 and storing it as it's the original engine number.
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