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    1 out of 1 members liked this post. Yes Reputation No

    How much can handle M54B25 with stock bottom?

    Hi guys!

    May somebody know how much power (and boost) can handle M54B25 with stock internals and VAC steel head gasket for 8.5 CR + raceware studs?

    Also I'm thinking about B30 crankshaft, rods and custom JE pistons with 8.5 CR - how much power can handle with this combo?
    And what M54 block max boost?

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    Click here to enlarge Originally Posted by BMW4ever Click here to enlarge
    Hi guys!

    May somebody know how much power (and boost) can handle M54B25 with stock internals and VAC steel head gasket for 8.5 CR + raceware studs?

    Also I'm thinking about B30 crankshaft, rods and custom JE pistons with 8.5 CR - how much power can handle with this combo?
    And what M54 block max boost?
    You sound like someone that we may never hear from again in 2 weeks because the project became cost prohibitive.

    What is your budget?
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    @bluejeansonfire

    The max power handling capability of the block on the stock internals with 8.5 cr due to a thicker headgasket?

    I think you should be able to do 400's with that.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    @bluejeansonfire

    The max power handling capability of the block on the stock internals with 8.5 cr due to a thicker headgasket?

    I think you should be able to do 400's with that.
    400s wouldn't be an issue for the hardware....tuning would be. That's where my budgetary question came from.
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    @bluejeansonfire

    The max power handling capability of the block on the stock internals with 8.5 cr due to a thicker headgasket?

    I think you should be able to do 400's with that.
    I don't think the nternals will take you to 400 reliably for that set up with the cr being 8.5 you will need over 12 psi "depending n your turbo and supporting mods" so in my mind you will fold a rod under continued hgh rpm and boost.

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    1 out of 1 members liked this post. Yes Reputation No
    400 whp must be ok... ecu tuning by myself...

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    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    400s wouldn't be an issue for the hardware....tuning would be. That's where my budgetary question came from.
    It is in this instance where a Technique Tuning recommendation usually comes in. Honestly, I don't know why people are trying to re-invent the wheel here.

    You are a different story naturally Click here to enlarge

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    Click here to enlarge Originally Posted by jacobs323i Click here to enlarge
    I don't think the nternals will take you to 400 reliably for that set up with the cr being 8.5 you will need over 12 psi "depending n your turbo and supporting mods" so in my mind you will fold a rod under continued hgh rpm and boost.
    You may be right. The M52 can do it though...

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Honestly, I don't know why people are trying to re-invent the wheel here.

    You are a different story naturally Click here to enlarge
    My wheel is the wrong size, wrong color, and made of the wrong material. It also smells funny, and leaves a bad taste on my lips when I kiss it.

    Clearly in need of a re-design.
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    Stock piston ring lands don't like a lot of boost. You'll probably break ring lands at 400WHP, even with perfect tuning, sooner if you ever have any detonation.
    James Muskopf
    RRT Racing
    2007 E92 335i/6MT Procede Rev3 w/PWM meth, otherwise stock
    E28 M5, R171 SLK320

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    Click here to enlarge Originally Posted by JamesM3M5 Click here to enlarge
    Stock piston ring lands don't like a lot of boost. You'll probably break ring lands at 400WHP, even with perfect tuning, sooner if you ever have any detonation.
    Why is it worse than the M52 in this respect?

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why is it worse than the M52 in this respect?
    Different piston design/makeup.

    M52 pistons are made at a height for a headgasket twice as thick as the M54.

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    Click here to enlarge Originally Posted by Zak@activeautowerke Click here to enlarge
    Different piston design/makeup.

    M52 pistons are made at a height for a headgasket twice as thick as the M54.
    Thank you.

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    The iron block M50/M52/S52/S50US have a pretty consistent 400WHP limitation per TRM - The Racer's Market - guys in Atlanta. They break ring lands, even with proper tuning, around 400RWHP consistently. Years ago had an S50US with Eurosport twin screw customer break 3 piston ring lands, and later, a different S52 with Twinscrew in an M Coupe, both heavily tracked. The S50 owner had me put in a stock motor and dumped it for a C5 Z06 (upgrade, IMHO). Getting an M54 aluminum block motor to put down similar power would most likely be the same story.
    James Muskopf
    RRT Racing
    2007 E92 335i/6MT Procede Rev3 w/PWM meth, otherwise stock
    E28 M5, R171 SLK320

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    I'm thinking about M54 block with M52B28 internals to go. I will have ideal cubic engine with 84mm piston stroke = 84mm cylinder hole.

    Some calculations, M52 and M54 block height are 211mm:
    1) M54B25 - 75/2+145+27,81 = 210,31 mm (10.5 CR)
    2) M54B30 - 89,6/2+135+28,32 = 208,12 mm (10.2 CR)
    3) M54 with M52B28 crank+rods+pistons - 84/2+135+31,82 = 208,82 mm (? CR)

    CR will be close to M54B30, so I will use MLS head gasket - what mm? - and have 8.5 CR. Also may be will be M52B28 pistons from Wiseco but them have 8.0 CR and I don't like that. I'm not sure how much power M52B28 pistons capable but rods probably up to 600 hp (their design similar M50 non vanos 135mm that support 600 hp).

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    The headgasket thickness is different between the two engines. You would have to use atleast a .070 thick gasket on the M54 with those pistons to get a regular compression ratio. I see no reason in taking everything apart to put stock parts back in and use a thick gasket. Thick gaskets are more of a cheap band-aid than a fix. I know, cause I just blew mine and replaced it with a stock one. It lasted 40k miles.

    Take an iron block, notch out the head and stick dual VANOS on it. Put pistons in. Call it a day.

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    I decided to go with .120" Cometic MLS. My CR will be ~8.5Click here to enlarge

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    Click here to enlarge Originally Posted by JamesM3M5 Click here to enlarge
    The iron block M50/M52/S52/S50US have a pretty consistent 400WHP limitation per TRM - The Racer's Market - guys in Atlanta. They break ring lands, even with proper tuning, around 400RWHP consistently.
    That may be a limitation with the M52/S52, but I'd like to point out that the M54 has an aluminum block and revised cooling system. I know of a number of examples of M54B30s making over 400rwhp on stock pistons...

    Click here to enlarge Originally Posted by BMW4ever Click here to enlarge
    I'm thinking about M54 block with M52B28 internals to go. I will have ideal cubic engine with 84mm piston stroke = 84mm cylinder hole.

    Some calculations, M52 and M54 block height are 211mm:
    1) M54B25 - 75/2+145+27,81 = 210,31 mm (10.5 CR)
    2) M54B30 - 89,6/2+135+28,32 = 208,12 mm (10.2 CR)
    3) M54 with M52B28 crank+rods+pistons - 84/2+135+31,82 = 208,82 mm (? CR)

    CR will be close to M54B30, so I will use MLS head gasket - what mm? - and have 8.5 CR. Also may be will be M52B28 pistons from Wiseco but them have 8.0 CR and I don't like that. I'm not sure how much power M52B28 pistons capable but rods probably up to 600 hp (their design similar M50 non vanos 135mm that support 600 hp).
    Where did you get the deck height info from?

    If you were using correct measurements, you'd find that the compression ratios are different from what BMW advertises.
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    1 out of 1 members liked this post. Yes Reputation No
    I measure block height - 210.7 M52 and M54 211 mmClick here to enlarge
    Can you give me correct measurements? Thanks!

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    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    you'd find that the compression ratios are different from what BMW advertises.
    How can that be?

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    Click here to enlarge Originally Posted by BMW4ever Click here to enlarge
    I measure block height - 210.7 M52 and M54 211 mmClick here to enlarge
    Can you give me correct measurements? Thanks!
    Good stuff...most people don't check this stuff themselves.

    Have you cc'd the head and the block with the piston at TDC?

    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    How can that be?
    I don't completely understand it myself, but the measurements that I've made...and re-checked multiple times, have a slightly larger combustion chamber CC than what' you'd expect.
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    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    I don't completely understand it myself, but the measurements that I've made...and re-checked multiple times, have a slightly larger combustion chamber CC than what' you'd expect.
    Very interesting... and odd.

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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by PEI330Ci Click here to enlarge
    Good stuff...most people don't check this stuff themselves.

    Have you cc'd the head and the block with the piston at TDC?



    I don't completely understand it myself, but the measurements that I've made...and re-checked multiple times, have a slightly larger combustion chamber CC than what' you'd expect.
    No... Just ordered Raceware head studs. Next will be Cometic .120" MLS head gasket and Turbosmarts 38mm external wastegate. SPA Turbo manifold the way to go.
    It will be M54B28TU Click here to enlarge

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