1998 E36 328i - bore out - Page 2

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    #11
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    Quote Originally Posted by mistreku View Post
    You don't need custom HG, they already make mass-produced thick HG's for turbo'ed E36. You should easily see 350bhp from the engine, if you turbocharge it.

    But TBH, I don't think turbocharging it would be the best way to make it stronger. It will be more powerful, but defo not stronger than a N/A engine.

    Easiest way to gain some extra power would be to put the M54 3.0 internals into a 2.5 iron block. No boring needed, 84mm pistons in both engines.

    Then port and polish the head, M50 intake, free flow exhaust and remap, and you should be good for 250-260bhp.

    You'll have a stronger, bigger engine for a fraction of the price of turbocharging. Obviously, not as powerful, but not as expensive to build and run, either.
    thanks for the reply,
    by the 2.5 block, does it not have to be bore out to make it 3? or do u mean putting a 3 litter pistons in which has a longer stoke possibilly otherwise I don't understand how 2.5 can be converted to 3 without a longer stroke or bore out.
    if the latter is the case, does that mean m3 has the same block as 325 but longer stroke pistons ?

    i did not quite understood the acronym HG, what do u mean ?
    by free flow exhaust i assume u mean a de cat and tail pipe
     
     

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    #12
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    From memory, with the original pistons, it would be a 2.9, with the bored out block and 3.0 pistons, it'd be 3.0.

    HG- Head gasket.
     
     

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    You don't have to bore out the block because both the pistons in the M50B25 (e36 325i) and the M54B30 (e46 330i) are 84mm diameter. That goes for the M52B28 (e36 328i) as well, but I suggested the 2.5 block as it's iron cast and no nikasil issues there.

    Basically, you don't have to modify anything to drop the M54B30 internals into the E36 6 cyl engine. So you can use your block too, if you don't have any nikasil problems. Crank, rods and pistons will all fit the both aluminium and iron blocks in the E36 6 cyl engine.

    3.0L displacement comes from the whole combo of crank, rods and pistons. Longer stroke, yes.

    M3 block will have a different diameter for pistons, (86mm IIRC), so no, not the same block. Different head too.

    HG = head gasket.

    By free flow exhaust I meant the whole exhaust system: headers, de-cat pipe and back box. Ideally, for max output, headers and a straight pipe (around 2.5" I'd say) with a rear muffler at the end.

    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
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    Everything else is just stuff.
     
     

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    Quote Originally Posted by mistreku View Post
    You don't have to bore out the block because both the pistons in the M50B25 (e36 325i) and the M54B30 (e46 330i) are 84mm diameter.
    The 2.9 / 3.0 must be for using 2.5 rods vs 3.0 rods then.
    I rememeber a half done set up would get you 2.9, but at that stage you might as well go for the whole lot.
     
     

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    Quote Originally Posted by mistreku View Post
    M3 block will have a different diameter for pistons, (86mm IIRC), so no, not the same block. Different head too.
    M3 3l has 86mm and Evo has 86.6mm IIRC

    You can use the internals from a US M3 engine but not a Euro M3.

    Nikasil is just the lining of the bores,these can be replaced with steel liners(what BMW did to SA cars affected with Nikasil problems) instead of replacing the whole engine
     
     

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    Quote Originally Posted by TheEnd View Post
    The 2.9 / 3.0 must be for using 2.5 rods vs 3.0 rods then.
    I rememeber a half done set up would get you 2.9, but at that stage you might as well go for the whole lot.
    I think the 2.5 and 3.0 rods are the same length (135mm). Not absolutely sure about it, though.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


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    Everything else is just stuff.
     
     

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    Quote Originally Posted by mistreku View Post
    I think the 2.5 and 3.0 rods are the same length (35mm). Not absolutely sure about it, though.
    so if the diameter and the stroke is the same what will be the point of adding m3 internal to my 2,8
     
     

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    Quote Originally Posted by E36_turbo View Post
    so if the diameter and the stroke is the same what will be the point of adding m3 internal to my 2,8
    not M3 internals....E46 330 internals. M3 internals will not fit unless its from an American M3 which is a tuned up M50/M52 block.

    Have you priced up how much this work is going to cost you? It may work out cheaper to drop in an M3 lump than trying to stroke your current engine
     
     

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    #19
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    Quote Originally Posted by E36_turbo View Post
    so if the diameter and the stroke is the same what will be the point of adding m3 internal to my 2,8
    As STK said, 330i internals. Cranks are different.

    Quote Originally Posted by StK View Post
    Have you priced up how much this work is going to cost you? It may work out cheaper to drop in an M3 lump than trying to stroke your current engine
    Yes, but where's the fun then?


    An a bit more info on this:

    "3.0l Stroker
    ---------------

    M50B25:
    bore: 84 mm
    stroke: 75 mm
    compression ratio: 10 , (M50TU : 10.5)
    rod length: 135, (M50B25TU:140 mm)

    M54B30:
    bore: 84 mm
    stroke: 89.6 mm
    compression ratio: 10.2
    rod length: 135 mm

    You can build a M50 3.0l stroker motor by using:
    - crank M54B30
    - rods 135 mm
    - pistonsM54B30 .
    Maybe the crank case has to be modified to clear the higher stroke crank.

    rod lengths:
    M50B25TU: 140 mm
    M50B25: 135 mm (non VANOS engine)
    M52B25: 135 mm
    M52B28: 135 mm
    M54B30: 135 mm
    M20B20: 130 mm
    M20B23: 130 mm
    M20B25: 135 mm
    M20B27: 130 mm"

    Apparently, rods are not the same in 2.5 vanos and 3.0. But as I said, rods from 3.0 should be just fine.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


    If it moves (and it shouldn't): duct tape. 
If it doesn’t move (and it should): WD40.

    Everything else is just stuff.
     
     

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    #20
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    Quote Originally Posted by StK View Post
    not M3 internals....E46 330 internals. M3 internals will not fit unless its from an American M3 which is a tuned up M50/M52 block.

    Have you priced up how much this work is going to cost you? It may work out cheaper to drop in an M3 lump than trying to stroke your current engine
    so again what would be the benifit if the diameter and the stroke stayes the same ? if i am correct the diameter of the piston is 84 mm on my car and 330 e46 and the stroke is 35 or 34( which one ) then no gain so what will be the point?

    or i think what ui guys mean is to bore it out to 3 and then use 330 internal ? am i correct ?
     
     

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