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Thread: M42 Project started! (S42 Replica)

  1. #626
    Join Date
    Jun 2015
    Location
    Indiana, USA
    Posts
    12
    My Cars
    1995 BMW 318i AUTO
    maybe you guys could help..... i have a 95 M42 block w/ 97 M44 head oil pressure light is on, takes forever to start, idles rough, dies while driving. head if decked, ported and polished, the whole 9 yards. i may have some wires mixed up but it is throwing a coolant temp sensor code 1223 even before the swap. the original head was junk due to 3 cracks from the previous owner. but i need some help trying to figure out what the issue is here. if anyone has the diagram for the wire harness that goes down the center of the intake that would be great. so please anything helps. and before anyone despises me for the M44 head the reason is for the little extra low end and because they have 70% less friction and they are a crap ton quieter.

  2. #627
    Join Date
    Feb 2014
    Location
    United Kingdom
    Posts
    4
    My Cars
    1998 Compact 328
    I know this thread is long and probly missing some of it but here is a compact ti m44 engine I made a long time ago the spec was
    cams
    lightened flywheel
    standard exhaust manifold with high flow cat and straight through
    Ecu remap.
    K&n Filter
    Wish I had put it on dyno before it was taken apart this was last drive as had been in accident cracked the sump and bent front chassis
    https://www.youtube.com/watch?v=UakREeI3zgo
    Last edited by hk1828; 03-12-2016 at 03:24 PM.

  3. #628
    Join Date
    Jun 2015
    Location
    Albany, NY, USA
    Posts
    28
    My Cars
    1983 BMW 533i
    How can I contact you? I have a few questions but I'm a bit too clumsy on this forum and don't really know how to privately contact someone. Thanks!

  4. #629
    Join Date
    May 2008
    Location
    Trumbull CT
    Posts
    1,610
    My Cars
    1998 M3 Vert, 1992 318i
    Quote Originally Posted by samc5898 View Post
    How can I contact you? I have a few questions but I'm a bit too clumsy on this forum and don't really know how to privately contact someone. Thanks!
    Click on the username and select "private message"
    Caprica Junkie

  5. #630
    Join Date
    Apr 2015
    Location
    United States
    Posts
    1
    My Cars
    08 BMW 335i e92
    What head gasket was used for this project or what to use?? )
    Thinking to do same setup. ))

  6. #631
    Join Date
    May 2017
    Location
    madrid , madrid , spain
    Posts
    1
    My Cars
    1999bmw318Ci1998bmw318is
    hi i´m alejandra a new member in the forum . i´m trying to prepare an e 36 a 318 is for racing . im´interested in this post . there is any posibility to see the pictures .
    thanks for your help and sory because my english is not good .

  7. #632
    Join Date
    Aug 2015
    Location
    Cornwall
    Posts
    5
    My Cars
    E36 compact
    Hi can someone tell me if I can use the s50b32 pistons thank you

  8. #633
    Join Date
    Nov 2018
    Location
    Greece
    Posts
    2
    My Cars
    E30 e36
    hi my friend greetings from greece i have an e30 with the same swap but the pistons are broken.. i have bought euro m3 piston but in tdc i have 1,4 mm gap and the euro m3 pistons have 21mm pin and th old ones have 22 mm so my question is can you tell me exangly what piston did you use and what didi you do with the piston pin??? any information will be helpfull

  9. #634
    Join Date
    Apr 2020
    Location
    Midlands
    Posts
    11
    My Cars
    96 E36 318i/s
    Quote Originally Posted by DailyE36 View Post
    ^ i think the problem with m20 pistons is they only have two grooves cut out for the valves instead of four. in reality the cheapest way to have a m42 rotating assembly in a m44 would be to use a m42 block and m44 head. but its always interesting to see what parts will fit what engine.

    i was brainstorming ideas one night about a cheap way to make a 2L m42 with the m47 crank.
    m42 crank 81mm - m47 88mm = + 7mm
    m42/44 rod 140mm - m50 2.5L rod 135mm = -5mm
    m44 pistons apparently sit 2.5mm lower than m42 pistons.
    so 7mm -5mm -2.50mm = -0.50mm.
    if anyone understands that then this could make a 2L m42 using m47 crank, m50 2.5 rods and m44 pistons. this is just a simple (what parts will fit) that i was thinking about one day, so this is not accurate. but it can give some one something to think about if they want to make a m42b20 on the cheap side.


    so why do you need a new crank shaft anyway?
    Bit of a thread revival, but wouldn't the stroke be top to bottom? So you'd only add 3.5mm? And obviously 3.5mm lower too.

    The problem I see with the M50 and m44 parts is that the best part of the m42 is the forged parts, or does that not include the con rods? I'm guessing the pistons themselves aren't forged.

    I'm looking into this ATM, and concerned about the extra piston height. Especially if I want to run low compression and turbo it.

    So I'd need to lose 4mm+ and figure out exactly how much give me 8/9:1 before boosting. That sounds too maths-y for right now. I'd like to get a spare block and give it a go outside of the car.

    Of course I'm probably gonna bore out the liners a little too, because why not. Seems silly not to if I'm going to that extent with it anyway. But yeah, low comp pistons with the right crown height, and ring heights. I'm a little out of my depth with that level of calculation, so I'm hoping someone else has found a workaround, or forged rods/pistons that just fit perfectly and are suitable for boost.


    So that's not a question, but more appeal for an easy answer 😂

  10. #635
    Join Date
    Nov 2020
    Location
    Camberwell
    Posts
    1
    I have an M44 and want to do a turbo specific build. Would the M47 crank, M42 rods and either M42 or M44 pistons (I want forged so maybe M42) give me a low enough compression ratio. 8.5/9:1??
    Awesome build btw.

  11. #636
    Join Date
    Nov 2020
    Location
    Serbia
    Posts
    1
    My Cars
    528i 318ci
    Hey man,can i have your contact ... about m42 stroker i have some problems
    Thanks 😁

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