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Thread: Build yourself an S50B30 clone for cheap!!! DIY

  1. #26
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    Okay, new question, does an M52TUB25 head fit on an M50TUB25 block?. I'm wondering if it is possible to do make a 3.0 stroker with dual Vanos, but keep that good old bullet/ turbo proof iron block.
    Dual vanos setup from M54 will fit M50 head but it needs some modification to fit, very minor, some aluminum welding required also

  2. #27
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    subscrizzled, awesome idea

  3. #28
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    1986 E30 - M50 3.0
    i'm planning on replacing my M50b28 internals and do what is explained here in this article.
    but can anyone explain the modifications that need to be done to make the vanos unit from the M54 fit into the M50 head? anybody got pictures for it?

    anything else needs to be modified other than the vanos or that's it? everything else is just a bolt on thing as if i'm installing my old M50b28 parts back in the block?

    any additional details are highly welcome because I would love to gather all the needed information before taking the engine apart. thanks

  4. #29
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    Quote Originally Posted by Alameer View Post
    i'm planning on replacing my M50b28 internals and do what is explained here in this article.
    but can anyone explain the modifications that need to be done to make the vanos unit from the M54 fit into the M50 head? anybody got pictures for it?
    On the exhaust side of the head, the last stud has to be re-drilled and re- tapped or simply removed , one stud won't hurt, And then use ultra gray silicone to seal the vanos to the head.
    On the same spot where there is exhaust camshaft sensor on the dual vanos unit, the M50 head will need to be machined using dremel tool, then a small spot of aluminum weld needs to be welded on the M50 head and then resurfaced to create sealing pad. Not hard to do if you got someone who can weld aluminum. Rest of the dual vanos parts will fit the M50 head without problem.
    But there is no benefit of having dual vanos at all. Dyno results who that there is no horsepower gain from using dual vanos vs. single vanos.

  5. #30
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    1986 E30 - M50 3.0
    Thanks a lot for providing the explanation hakentt

    i think i got the idea, but there's a slight terms barrier since my original language is not arabic, and mechanics here use localized terms, i so wish some pictures can be provided to illustrate the sequence of actions that needs to be done.

  6. #31
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    pretty damn brilliant if i say so myself!

  7. #32
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    is the motor running yet?

  8. #33
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    German Rice
    I'm assuming this cannot be done for a M52/M52tu

  9. #34
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    would really appreciate some pictures for the dual vanos modification procedure (before and after)

  10. #35
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    would really appreciate some pictures for the dual vanos modification procedure (before and after)

  11. #36
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    I'm planning on doing this, too. Just picked up a 325i parts car to do so. I would still like some more info on how to run the M54 intake cam. It would save me some good money instead of buying S50 cams.

    What would happen if I used the M50 cams? Would it run poorly?

  12. #37
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    I reused the piston rings, they were fine, no need to waste money.
    I did that once... didn't work out so well...

    t

  13. #38
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    How much more weight is added by using the iron block vs the M52?

    I'm guessing this setup would hold well to being boosted?

  14. #39
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    2005 330 zhp, e36 m3/4/5
    Quote Originally Posted by Crime Wave View Post
    I'm assuming this cannot be done for a M52/M52tu
    I'm doing some research now on that actually because im interested in doing this to my m52b28. What ive gathered so far is that
    m52b28
    Bore: 84mm
    Stroke: 84mm

    The s52 crank provides 89.6mm stroke in its engine, i believe its the same as m54 crank

    Since effectively the s52 is a bored out and stroked m52 the rods and crank from a s52 or m54 should actually fit without any modification needed to the oil pan. In the end you will end up with the same 3.0-3.1L engine if you were to do it to a m50.

    Im still trying to find more information so if anyone knows any reasons why this wouldnt work in a m52 engine that would be great. The bores for the m50 m52 and m54 are all 84mm so i dont think there should be any issues.

  15. #40
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    If you want to stroke an m52 you can use an s50 crank and connecting rods,this will give you 2.9 liters,higher compression and s52 power with a tune.

  16. #41
    Join Date
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    E36 M52B30, M54B30
    fit perfectly on my M52B25 engine.
    my setup using inner M54B30 crankshaft, rods and pistons.
    I'm on my second project on M50B20 engine but still not sure which route I'm going to take, using full inner parts of S50B30 US and bore up to 86 or keep using proven setup using M54B30 inner parts and bore up only to 84mm

    Quote Originally Posted by Crime Wave View Post
    I'm assuming this cannot be done for a M52/M52tu

  17. #42
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    great writeup. interested what the compression ratio would be if the pistons rested flush with the top of the block. Also what parts should I use to acheive that.

    also what is the highest compression you can safely run on 93 octane?

    Quote Originally Posted by ovation1000 View Post
    If you want to stroke an m52 you can use an s50 crank and connecting rods,this will give you 2.9 liters,higher compression and s52 power with a tune.
    So if I use the m52 block m54 crank/ pistons with the s50 rods, will the pistons sit flush with the block? I'm assuming the rods are longer on the s50. And what would be the compression ratio?


    thanks
    Last edited by BMWMPow3r; 10-21-2011 at 06:47 AM. Reason: Automerged Doublepost

  18. #43
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    knoxville tn
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    If you want to have more power than S50 engine from 1000 to 6000 rpm then get M54B30 intake camshaft(240 duration, 9.7mm lift, you must shorten the vanos gear at least 4mm) and just reuse your M50 exhaust camshaft.



    can someone explain how to shorten the vanos gear? this build will be happening soon with me as in i just cracked the oil pan so why not do this in the process

  19. #44
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    Excellent stuff man! I'll be building one here VERY soon. Already sourced my 3.0L crank.
    CURRENT:
    Racecar: '81 e21 320i Group2. GT28 @ 25psi, MS2, e28 M5 suspension/brakes underneath, forged, cammed, 400bhp, 2190lbs, etc, etc...
    Daily: '95 e34 540/6. DUDMD tuned, vogtland/koni, Schnitzers, other minor touches.
    Project: '94 525iT. S50 swapped, supercharger in the works, manual swapped, Airlift supsension, Mpars, Brembo's, clean machine.
    New daily: e60 530i sport package. Stock.

  20. #45
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    Update.
    I updated the first post with M54b30 camshaft mod
    Last edited by hakentt; 10-26-2011 at 04:03 AM.

  21. #46
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    Jul 2010
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    Amman, Jordan
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    1986 E30 - M50 3.0
    Thanks hakentt, but unfortunately i still don't get what is meant by shortening the vanos gear. do you a picture of the before and after? so we see the difference and know what is modified and how it was modified.

    i'm discussing it with the mechanic and he is laughing at me for the whole idea (especially the camshaft) and telling me to stick with my current 2.8L engine.

    another thing... would i get more power if i remove 1 mm from the block so instead of 2mm clearence i'm left with 1mm? what are the ups and downs for this?

  22. #47
    Join Date
    Oct 2007
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    Brighton, MA
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    E36 M52B30, M54B30
    around 20kg

    Quote Originally Posted by Hdale85 View Post
    How much more weight is added by using the iron block vs the M52?

    I'm guessing this setup would hold well to being boosted?

  23. #48
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    '94 325i vert
    In the dyno thread linked at the beginning there was some discussion that the car was running lean. Was this ever solved? Can the engine run at the proper ratio with a factory ECU and tune? Cali laws are coming into play here...

  24. #49
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    '97 328i
    Quote Originally Posted by Alameer View Post
    Thanks hakentt, but unfortunately i still don't get what is meant by shortening the vanos gear. do you a picture of the before and after? so we see the difference and know what is modified and how it was modified.

    i'm discussing it with the mechanic and he is laughing at me for the whole idea (especially the camshaft) and telling me to stick with my current 2.8L engine.

    another thing... would i get more power if i remove 1 mm from the block so instead of 2mm clearence i'm left with 1mm? what are the ups and downs for this?
    Not that I'm going to try this, but I'm trying to understand this shortening of the vanos gear myself. It looks like the gear inside of the cam sprocket in the picture below needs to be ground down in order to be compatible with the M52 vanos insert that goes between this gear and the inside teeth of the sprocket?

  25. #50
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    I'm trying to figure out about grinding the gear, too. The OP seems to never answer this question.

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