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  1. #1
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    PPM-Racing (Pure Performance Motorsport) 4.2 liter S38 inline-6 stroker kit - $6900

    The BMW S38 is one of (if not arguably the best) the most impressive inline-6 cylinder motors ever produced by BMW. We will leave that debate for another article however and instead give you the details on the PPM-Racing 4.2 liter stroker kit. It includes forged pistons, H-Beam connecting rods, and a billet 4340 crankshaft. It is applicable to either 3.6 or 3.8 liter S38 motors from the BMW E28 M5 and BMW E34 BMW M5 respectively.

    The kit can be customized and accommodate naturally aspirated or boosted builds with compression ratio choices for the pistons including 8.0:1, 8.5:1, 10.0:1, 11.5:1, or 12.0:1. Piston sizes are either 94.5 or 95.0 mm. The kit is designed to use a 1x compression ring. Awesome? Yes, awesome.

    Pricing: $6900

    Included:

    - 6x forged pistons
    - Rings, pins, locks
    - 6x H-Beam connecting rods
    - ARP2000 rod bolts
    - 98mm Billet 4340 crankshaft

    Click here to enlarge

    Click here to enlarge

    Click here to enlarge
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    Any power figures?

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    Any power figures?
    It depends on the chosen setup...
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    germanboost.com/showthread.php?995-PPF-E30-S38-Turbo&p=11396#post11396
    Click here to enlarge Originally Posted by Sticky
    Can't the S38 go to 4.2 liters or so?
    Haha. Are you prophet or what? lol

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    Holy $#@! this is awesome, the inline six is bigger in displacement than an S65. I would make this thing 12:1 compression all motor and rev the $#@! out of it.

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Holy $#@! this is awesome, the inline six is bigger in displacement than an S65. I would make this thing 12:1 compression all motor and rev the $#@! out of it.
    Or the same but with 8:1 compression with a one of the T4 EFR choices and throw as much boost as it can take. Probably would have one of the fattest/fastest spooling I6's around!

    E85 for fueling of course. Or methanol if you are the drag racer 2000HP type. Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Holy $#@! this is awesome, the inline six is bigger in displacement than an S65. I would make this thing 12:1 compression all motor and rev the $#@! out of it.
    13:1 e85 all motor 8k aggressive cams $#@! ya
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    ^ thats cool and all but a 4.2 liter inline 6 with 12:1 compression at 8500 RPM sounds so nice!!!

    Turbos shmurbos
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    ^ thats cool and all but a 4.2 liter inline 6 with 12:1 compression at 8500 RPM sounds so nice!!!

    Turbos shmurbos
    I have a feeling it wouldn't last long at 8500 rpm...

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    Click here to enlarge Originally Posted by radasaurus Click here to enlarge
    I have a feeling it wouldn't last long at 8500 rpm...
    You wouldn't last long at 8500 rpm.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    1 out of 1 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You wouldn't last long at 8500 rpm.
    what the $#@! is that supposed to mean? The fact is its a VERY long stroke crank on a straight six that has harmonic issues past 7k with the stock crank. I am not denigrating the kit or the idea of an 8.5k rpm 4.2L s38 screamer (which would be awesome), but it's a pipe dream.

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    Click here to enlarge Originally Posted by radasaurus Click here to enlarge
    what the $#@! is that supposed to mean? The fact is its a VERY long stroke crank on a straight six that has harmonic issues past 7k with the stock crank. I am not denigrating the kit or the idea of an 8.5k rpm 4.2L s38 screamer (which would be awesome), but it's a pipe dream.
    Didn't mean anything it was a joke. You are right that it is a long stroke and the piston speeds will be high. The S54 has this same issue but has survived 9000 rpm.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    3 out of 3 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by radasaurus Click here to enlarge
    what the $#@! is that supposed to mean? The fact is its a VERY long stroke crank on a straight six that has harmonic issues past 7k with the stock crank. I am not denigrating the kit or the idea of an 8.5k rpm 4.2L s38 screamer (which would be awesome), but it's a pipe dream.

    I did some digging Click here to enlarge PPM 95/98mm 4.2l Stroker kit is much lighter then the OEM S38B36 crankshaft,rods,pistons! So the reciprocating weight is less then OEM S38B36 with the huge extra stroke!
    Also the Crankshaft is Billet, Rods are forged,Pistons are forged so the kit is more durable then OEM parts. PPM Looked at the harmonics as well, and Ross/PPM Balancer was designed and made to tangle this issue as well. So what i can see all the possible problems where take into-count when this kit was designed for the passionate N/A RacersClick here to enlarge

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    What cylinder head types are available for this motor? Non vanos, single vanos, dual vanos?

    The reason I ask, is I think I remember hearing someone say that either this engine was available as a vanos motor later in its lifetime, or a later engine's cylinder head with vanos fit on the engine.

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    2 out of 2 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by metrik Click here to enlarge
    What cylinder head types are available for this motor? Non vanos, single vanos, dual vanos?

    The reason I ask, is I think I remember hearing someone say that either this engine was available as a vanos motor later in its lifetime, or a later engine's cylinder head with vanos fit on the engine.
    Looks like I was making things up, VANOS never touched these motors. @Sticky, I'd love it if you wrote an article about this motor, like the excellent one you did on the s54 and s65.

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    Click here to enlarge Originally Posted by metrik Click here to enlarge
    Looks like I was making things up, VANOS never touched these motors. @Sticky , I'd love it if you wrote an article about this motor, like the excellent one you did on the s54 and s65.
    Those articles are incredibly time consuming. I likely will do a top 5 BMW motors article.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    thanks $#@!. i just spent a bunch of money already. damnit now this too!

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    this is right next to the ford falcon inline six now that this stroker kit is available

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    I vote 8.5.1 turbo setup with a gtx42 turbo redline at a safe 8200 rpms. That thing would have a monster powerband.
    Click here to enlargeClick here to enlarge

  20. #20
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    Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
    I vote 8.5.1 turbo setup with a gtx42 turbo redline at a safe 8200 rpms. That thing would have a monster powerband.
    I'm right there with you brotha! None of this weak NA nonsense. Click here to enlarge

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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    I'm right there with you brotha! None of this weak NA nonsense. Click here to enlarge
    Yes who gives a crap about N/A? Not even BMW any more. Click here to enlarge
    Click here to enlargeClick here to enlarge

  22. #22
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    Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
    Yes who gives a crap about N/A? Not even BMW any more. Click here to enlarge
    Click here to enlarge

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    Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
    Yes who gives a crap about N/A? Not even BMW any more. Click here to enlarge
    That does not mean NA is bad.

    A stroked s38 like this fits the e30 character more. The chassis doesn't need 1000 whp.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    That does not mean NA is bad.

    A stroked s38 like this fits the e30 character more. The chassis doesn't need 1000 whp.
    E30 is played in my eyes. There are a million people who have done the e30 thing
    Click here to enlargeClick here to enlarge

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    1 out of 1 members liked this post. Reputation: Yes | No
    You are all wrong and my opinion is better.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


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