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Thread: S42 engines?

  1. #1
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    S42 engines?

    Does anyone have any sites with some reliable info and pictures of the BMW S42 engine?
    Its the same 2.0l engine used in some E36 race cars in the BTCC series..

    I have been searching for a while and come up with limited and mixed up information

    Also, does anyone know if the S42 engine parts like camshafts are transferrable to the street version M42 engine?

    Thanks

  2. #2
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    there was an artical on a 318is saloon (a 16v we didn't normally get in the uk) which is the homologation special for the BTCC, In a recent issue of Total BMW, (a uk mag). i'll try to dig it up. not too much about the engine, but plenty of history.

    Giftschrank Projekt

  3. #3
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    thats crazy that u mention this, a few months ago in some other forum, i saw a link to wwhat i remember to be TMS(turnermotorsports), and they were selling a i4 bmw engine, that had like 220hp, 200lbt, i had no idea what it was, they said it was realy rare.... sounds sweet, keep researching

  4. #4
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    enda320 - which issue of total bmw was it? I can buy that magazine here in Australia and never saw that article

    has anyone got any info at all? i've pretty much given up on searching

  5. #5
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    What's the M42 engine? Is that the 1.9 liter i-4?

  6. #6
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    m42=1.8
    m44=1.9, 96 & up

  7. #7
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    The S42 engine was a 2.0L touring car engine with a 86.5mm bore and around a 85mm stroke, which shared the same block as the street going M42. Unlike the common M42, the S42 had a more sophisticated engine management system, and had individual throttle bodies. The S42 unfortunately did not share the same valvetrain as the M42, and is a solid lifter valvetrain (possibily from the S50Euro) fully capable of over 9000rpm, but was limited to a 8500rpm redline, as dictated by touring car rules. It was mounted upright in the bay, not slanted, and ran on a full dry sump oiling system. The pistons had a static compression ratio of around 12:1, and running on pump gas, the S42 made around 280hp (and up to around 310hp later in it's life). Good luck finding more information on the internet about the S42, it's next to impossible.

    Oh, and no, the S42 cams will not fit

  8. #8
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    Unfortunately, almost none of the S42 parts would make a practical street M42 engine, except for maybe the internals (minus the 12:1 comp pistons). I'd love to get my hands on a S42 crankshaft.

    If you really want to build up a M42, you should start with some 3.2L M3 pistons (86.5mm bore), some custom rods, a full engine balance, and a stand alone engine management system, like Motec, and a mild camshaft. You'd probably have to run a custom front crank pulley/harmonic balancer, since I've heard the stock M42 one fails at 7200rpm. Doing all of this to the M42 would make a fun track engine, but it would not create a torque monster since even a fully worked S42 only produced around 185ft-lbs of torque at a very high ~7.5k rpm.

    If you want to be fast on the track, build up a M42.

    If you want to have fun on the street, swap in a 6 cylinder.

    If you want a compromise between the two, supercharge the M42.

    In short, there are no really good bolt torque improvements for the M42, short of a supercharger.

  9. #9
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    it's in the dec- 03 issue- with a picture or a schnitzer 530d on the cover. tag line says Rare 318is - M powered e36

    Giftschrank Projekt

  10. #10
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    Originally posted by BimmerToad


    If you want to be fast on the track, build up a M42.

    If you want to have fun on the street, swap in a 6 cylinder.

    If you want a compromise between the two, supercharge the M42.

    In short, there are no really good bolt torque improvements for the M42, short of a supercharger.
    I like how BimmerToad thinks

    I've seen a picture of an E36 318 w/ an S14 engine, but I never heard of an S42. Is this the car that Joachim Winklehock drove in the 1994 BTCC championship? It was also a 2.0L M42 motor.

    Bry
    1994 M-Technic M42 Saloon - Trillium Chapter - 5130
    - View my mods and more pictures
    <img src="http://www.maxbimmer.com/forums/attachment.php?attachmentid=44220&stc=1">

  11. #11
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    Originally posted by M42 Technik
    Is this the car that Joachim Winklehock drove in the 1994 BTCC championship? It was also a 2.0L M42 motor.

    Bry [/B]
    The 2.0L version of the M42 raced in touring car championships was the S42, which replaced the 2.0L version of the S14 in '94, I believe.

  12. #12
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    yes, the S42 was the S14 replacement.. it only had 7 hp more..

    so anyone have any pics of an S42?

  13. #13
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    '94 M42 Project Car
    I have pics of J. Winkelhock's '93 318i during the '94 BTCC champion. It's a Team Schnitzer S42.
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    1994 M-Technic M42 Saloon - Trillium Chapter - 5130
    - View my mods and more pictures
    <img src="http://www.maxbimmer.com/forums/attachment.php?attachmentid=44220&stc=1">

  14. #14
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    '94 M42 Project Car
    Whoops, that was Tony Soper's car. This one is Winkelhocks.
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    1994 M-Technic M42 Saloon - Trillium Chapter - 5130
    - View my mods and more pictures
    <img src="http://www.maxbimmer.com/forums/attachment.php?attachmentid=44220&stc=1">

  15. #15
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    '94 M42 Project Car
    This one is Tim Harvey's 1992 318is. There are no engine specs available. But this car was probably the one using the S14, whereas the previous 2 were most likely S42's.
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    1994 M-Technic M42 Saloon - Trillium Chapter - 5130
    - View my mods and more pictures
    <img src="http://www.maxbimmer.com/forums/attachment.php?attachmentid=44220&stc=1">

  16. #16
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    Photos of photos look like crap, but I don't have a scanner...
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  17. #17
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    another...
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  18. #18
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    those came from Cecotto's car.

    I was able to get closer to this much more interesting car, coming out of post race tech. It wouldn't restart, so the guy in the driver's seat eventually had to get out push it back to the trailer with some help from the crew.
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  19. #19
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    Not to steal this thread, but has anyone, or does anyone know of anyone, who has either put cams in a M42 or done any internal performance modifications to the M42?

    I've heard of a 2.0L M42 revving up to 8500rpm (on a stock 94-95 valvetrain) putting out 230hp from a full standalone engine management system and 300 degree cams. Unfortunately, it's not the most streetable engine. . .

  20. #20
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    BimmerToad - to pull 8500rpm in an M42 you're going to need a solid lifter conversion, apparently Euro 3.2 items can fit.. Im not sure how long the rest of the engien will react to those sort of rpm..

  21. #21
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    From what i have been told by people who are currently developing a very high output supercharger for the m42/44 the m42 (at least '94 motor) had solid lifters. as for the 2.1 crank ACS and there's another company that sells a 2.0 stroker.

    Tom

  22. #22
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    here's the ACS 2.1 stroker motor: http://www.acschnitzer.com/englisch/...6_englisch.pdf

    Here's the 2.0 stroker: http://www.tdi-plc.com/bmwE36318iS.htm

    Tom

  23. #23
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    I'm pretty sure all the m42's came with hydraulic lifters...
    no

  24. #24
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    Originally posted by 943184dr
    From what i have been told by people who are currently developing a very high output supercharger for the m42/44 the m42 (at least '94 motor) had solid lifters. as for the 2.1 crank ACS and there's another company that sells a 2.0 stroker.
    My friend just got his M44 back which is boosted, he made to swap to solid lifters...

    Hartge also sells a stroker kit, takes the 1.8 out to 2.1
    The prce for that stroker kit in Australia is about the same as what a good condition 318is goes for!!

  25. #25
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    94 and 95 M42 engines use 6mm valve stems, which allow for a reduction in valve float at high rpms, and they have hydralic lifters. While a solid lifter conversion would be piece of mind when operating at a redline of 8500 rpm, I don't think it is needed. Overall, the M42 valvetrain is pretty beefy. Hell, even the bottom end of the M42s is completely forged. I can't say the same about M44s . . .

    In my mind, there are 3 main bottle necks from creating a high revving M42:

    1.Unfortunately there is a crappy vibrational dampener on the crank pulley which fails at roughly 7200 rpm, and can end in a broken forged crankshaft.

    2.M42s come with a restrictive AFM

    3.E36 M42s come with a dual stage intake manifold. While it greatly improves low end torque, it probably kills the top end.

    A stand alone engine management system ($$$) could solve the AFM issue by replacing it with a MAP sensor. Either enlarging or porting the high speed intake runners of the E36 intake manifold or swapping the manifold for a custom individual throttle body manifold ($$$) or a E30 M42 manifold would solve the manifold issue. Creating a custom crank pulley and fully balancing the bottom end might solve the vibrational dampener issue, granted the custom pulley has sensor pick ups for the crankshaft sender unit.

    The M42 has potential, but it doesn't lend itself well to cheap upgrades. Just look at http://www.gttechnic.com/ , they race built M42s. Are they cheap engines, unfortunately not, but I bet they'd be a blast to drive :

    I suppose I've done with my rambling . . .

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