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Thread: M42 Project started! (S42 Replica)

  1. #1
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    M42 Project started! (S42 Replica)

    Well, I have finally started my project to build a replica S42B20 motor.

    I pulled my 318i into the garage on monday and removed and stripped the M42B18 down to its bare components. Afew months back I got hold of a M44 sub-assembly and started by stripping it down and cleaning it up. I had it bored out from 85mm std to 86mm to fit Euro M3 3.0lt pistons.

    At this stage I was going to use the M44 crank which had an 83.5mm stroke but found out that a M47 (E46 320d) crank might fit, it did. Now I have an 88mm stroke. The nice thing about the M47 crank is it has the same dia. big-ends and main bearings as the M42/M44. And its a forged crank! With the 86mm bore and 88mm stroke its now a 2045cc motor (nearly a 2.1lt). With M3 3.2lt pistons it would be a 2069cc. I am using the M44 rods for the job, the pistons are being decked and pocketed this week, this will make 'em flat-top and raise the compression some too.

    Once I get everything back from the engineers I will have the whole bottom-end fully balanced and look into that stupid harmonic damper...
    I got some quotes today for Euro M3 throttle bodies and will get a set of 6 next week which will cost me R2500=$375. I will remove the two center ITBs and I will be using the 300cc M3 injectors and the Euro M3 plenum chamber but cut off the two ends to make it work with the 4 ITBs.

    As for the head, I will buy another M42 head at a later stage and fit M3 3.2lt 35mm intake valves, cut them 3-angle along with the 30mm exhaust valves. Gas-flow the head and finish off with a nice polishing and a skimming to raise the compression even more. I will fit the solid lifters from the Euro M3 too so I can rev it over 7500rpm. I have only found one set of cams that I can use which are made by Schrick. They have a 256 duration and a 10.4mm lift, I think they will be a little small for what I want. Can someone point me in another direction??? Custom cams or some other company makes M42 cams already?

    The exhaust system I have should be alright for now, Im using the M42 manifold coupled to a custom 57mm s/s freeflow system with twin staggered chrome tips. I will change the tips to a single smallish chrome tip to give it a sleeper look, hehe. When I get the other cyl head done I will get some custom 48mm exhaust headers made up.

    As for the management, I will be using the std Bosch DME with a Dastek unichip. I could look into a stand alone system at a later stage but its not that neccesary for a normally aspirated car. The guys at www.kempower.be manage 315hp out of a normally aspirated S42B20 with the Bosch DME so it should be good enough for me...

  2. #2
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    Well, as one of the few M42s racing in the US, I've got to say good luck! I'll have my engine out this winter in favor of an I6, however, I'll have the M42 sitting in the garage waiting for upgrades...and potential future deployment.


    Andy Chittum -- Lemans Karting | BTM Motorwerks NASA Spec e30 | US Touring Car | Racecarnology Blog

  3. #3
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    I will keep this thread up to date with the progress and post lots of pics. I know you M42 guys have been waiting a while for this kinda thread to come along. VIVA LA M42 CLUB!!!

    Here's a little teaser of an S42B20

  4. #4
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    did bmw develop that motor in germany as a street motor? or a race motor?

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  5. #5
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    wow.. hope everything turns out fine
    and good luck

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    wow man yes keep us posted should be very interesting and maybe others can follow your steps. omg honda guys build the 1.8 n/a motor to well over 200 whp all the time with cams pistons ect. and tune, why cant the bmw guys do the same. i mean hey they have a choice to get the bigger 2.2(prelude)motor too like us getting the 2.5 but they choose to built the 1.8 instead.
    E36--> >> >>> >>

  7. #7
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    yo. i want all of that!!!!!

    300+ outta a 4banger. thats insaaaaaaaaaaaaaaaaannnnnnnee...

    i would love to take on a project like that. hope it all goes well

    mike

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    its about time someone has actually gone forward with this! good luck!
    BMWMOFO C6MPACT

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    I love you.. marry me when you are done so I can divorce your ass and take that ride as part of the settlement.

  10. #10
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    Quote Originally Posted by QuiickSilverM3
    did bmw develop that motor in germany as a street motor? or a race motor?
    It was built for the E36 touring cars after they stopped using the FIA 2.0lt S14. So it was never offered to street cars, a pity though, 'cos imagine the S42B20 in a street car making 315bhp @ 8400rpm and the rev limiter at 8600rpm...

  11. #11
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    one question... how in the world did they get 315bph out of it? isnt that motor 2.0?
    E36--> >> >>> >>

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    Quote Originally Posted by jiggynites
    one question... how in the world did they get 315bph out of it? isnt that motor 2.0?
    Yes it was a 2.0lt, it had around 12:1compression, single compression piston rings, slide individual throttle bodies, huge cams, solid lifters, major headwork...ect.

    www.kempower.be got the S14 (E30 M3 engine) up to 370bhp with NA tuning...

    I found a Euro M3 oil cooler that I will be fitting to the new engine as well, it just clips onto the bottom of the Euro M3 radiator I have already. I will just need to make some custom oil lines for it...

    I also drove my dad's E39 M5 tonight and fell in love with the steering feel, its so precise and sharp, now I wanna get a Z3 steering rack for my 318i...
    Last edited by Gizmo330iT; 10-27-2005 at 04:32 PM.

  13. #13
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    are you doing all this wor on ur own or do u have a shop doing it?

    mike

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    Quote Originally Posted by Gizmo318i
    I will keep this thread up to date with the progress and post lots of pics. I know you M42 guys have been waiting a while for this kinda thread to come along. VIVA LA M42 CLUB!!!
    Here's a little teaser of an S42B20
    OMG MFK What da hex muscle!!!

    Envy U, Man.
    Last edited by psyyambmw; 10-28-2005 at 12:47 AM.

  15. #15
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    Mitch is offline for science, you monster Secret Santa Deadbeat
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    This is going to be really sick. Wow. Keep up the good work.

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    Quote Originally Posted by e36
    are you doing all this wor on ur own or do u have a shop doing it?
    mike
    Im doing this myself, wouldn't dare let a shop have all the fun...I have built a few BMW motors before so Im experienced...

    Im getting the complete intake system from a euro M3 on monday/pay-day, also at a later stage I will get a Euro 3.2lt M3 6speed gearbox to throw into the mix.

  17. #17
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    This should be a fun little project to watch.
    I call BS - there's no bmw driver that can't run his car faster than any magazine has ever done before.
    -Joe

  18. #18
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    I agree that this should be an awesome build. Best of luck!

  19. #19
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    I stripped the cyl head down today to replace the valve stem seals only to find ALL 8 exhaust valves are bent. sonofabitch!

    I guess I will do the complete head work now, I need 8 Euro M3 35mm intake valves and 8 new 30mm exhaust valves. I will have them cut 3-angle and gasflow the head. $$$$

    Now the M3 ITBs will have to wait a while, DAMN!!!

  20. #20
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    Can you get pictures of this? Especially all the broken stuff :P

  21. #21
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    6 of the 8 bent valves, who knows how these things were still sealing...


    Here are the 3 different cranks, on the left is the M42, M44 in the middle and the M47 on the right. Notice the lack of double counter-weights on the M44 crank...


    I bought an E34 M5 oil cooler today and bolted it up to my M3 radiator, the radiator is upside down.


    I also bought Euro M3 injectors today, std 318i injectors are on the top, M3's on the bottom.

  22. #22
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    can the m3 injectors replace the m42 injectors? sorry im thick when it comes to the engine, wot do they do exactly? and QuiickSilverM3 i love them angel eyes on your beemer they look sick where can i get a set like that from?

    cheers
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  24. #24
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    what this project going to cost part wise?
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