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Thread: M50 Non Vanos 10.0:1, what would .140" MLS drop to?

  1. 07-30-2006, 03:21 PM #1
    5mall5nail5's Avatar
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    M50 Non Vanos 10.0:1, what would .140" MLS drop to?

    I am going with the .140" regardless, but I want to know how low it will drop the M50 non vanos since the non vanos is already 10.0:1 instead of 10.5:1 like other M5x motors
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  2. 07-30-2006, 04:21 PM #2
    e36'n
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    Using the spreadsheet that was made by two members a couple months back, I get 8.3969:1. That's assuming stock bore and stroke at 84/75mm respectively.
    -Curt

    stock CR 92 non-vanos 325 / first ever Holset HY35 powered BMW / custom tubular manifold & motor mount / stock DME tuning / tial 50mm bov / 46mm xspower w.g. / green top injectors / IC piping designed by myself (above subframe of course) / 12x28x3" IC / oil return into pan that seems to work / e21 tranny mounts / custom blow through MAF / koni sport kit / 18x8.5 mvr replica's / various leaks & body colours
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  3. 07-30-2006, 04:23 PM #3
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    highboostingm3
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    That's nice for really big boost.
    Where have I been? Astral projecting.

    Quote Originally Posted by jszy25 View Post
    Get drunk with Mike Radowski they said, it'll be fun they said...A broken toe, the worst hangover known to man, and bite marks in my arm said otherwise
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  4. 07-30-2006, 04:27 PM #4
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    Yeah 84mm bore 75mm stroke. 8.3:1 huh, sounds choice
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  5. 07-30-2006, 04:34 PM #5
    e36'n
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    Basically 8.4:1. How much boost could you run on pump gas (91 or 93) with that? What about using a 0.120" which drops it to 8.79:1?
    -Curt

    stock CR 92 non-vanos 325 / first ever Holset HY35 powered BMW / custom tubular manifold & motor mount / stock DME tuning / tial 50mm bov / 46mm xspower w.g. / green top injectors / IC piping designed by myself (above subframe of course) / 12x28x3" IC / oil return into pan that seems to work / e21 tranny mounts / custom blow through MAF / koni sport kit / 18x8.5 mvr replica's / various leaks & body colours
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  6. 07-30-2006, 04:42 PM #6
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    highboostingm3
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    Quote Originally Posted by e36'n
    Basically 8.4:1. How much boost could you run on pump gas (91 or 93) with that? What about using a 0.120" which drops it to 8.79:1?
    Depends on tune but I would say you could easily run 21 to maybe 24 psi with that on 93 using low timing up top. Only 17-18psi on 91 to be safe.
    Where have I been? Astral projecting.

    Quote Originally Posted by jszy25 View Post
    Get drunk with Mike Radowski they said, it'll be fun they said...A broken toe, the worst hangover known to man, and bite marks in my arm said otherwise
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  7. 07-30-2006, 04:48 PM #7
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    I want lowest compression possible. 8.4:1 is perfect. I am going to run ~9 psi daily and was hoping 18+ in high mode
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  8. 07-30-2006, 05:47 PM #8
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    Quote Originally Posted by UrineMachine
    I want lowest compression possible. 8.4:1 is perfect. I am going to run ~9 psi daily and was hoping 18+ in high mode
    lmao, that will change to 15 psi daily and 22 in high mode after a week.
    A word of Internet Forum wisdom: Disregard any advice that begins with "I've heard..."

    97 M3/4 - S54, TRM Coilovers, UUC SSK/Sways/LTW Flywheel



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  9. 07-30-2006, 06:03 PM #9
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    Quote Originally Posted by Shuasha
    lmao, that will change to 15 psi daily and 22 in high mode after a week.
    Just let it in...that's it...just take the ride as it travels through your veins...no, it's not heroin...it's a much much better rush yet it's much much more addicting.
    Where have I been? Astral projecting.

    Quote Originally Posted by jszy25 View Post
    Get drunk with Mike Radowski they said, it'll be fun they said...A broken toe, the worst hangover known to man, and bite marks in my arm said otherwise
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  10. 07-30-2006, 07:59 PM #10
    northeaste36
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    Attached is the equation used for calculating compression ratio.

    B=bore

    S=stroke

    Vc=Volume of combustion chamber, head gasket, volume from piston compression height to deck, and +/- any piston dish or dome.

    Do people really have all this info somewhere? Because I really need it. If someone has all this info for these M/S5x motors, I will send you a present.
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