1998 E36 328i - bore out - Page 3

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    #21
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    Quote Originally Posted by E36_turbo View Post
    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 ?
    Mate, stroke IS NOT the same. Rods are the same length, in 2.5 nv and 3.0, and bit longer in 2.5 vanos. But cranks are different, giving a different stroke.
    There are only two products required to make the universe work properly: Duct tape and WD40. 


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    #22
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    [qoute]
    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.

    [qoute]
    hi sorry, I did post my thread at the same time as u thus did not see ur reply

    would u think my 328 block will take the new pistons from e46? why not just use the existing crankshaft from my car for the pistons if they have a same height but different stroke, is the buttom end different?

    thanks
     
     

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    #23
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    Crank case doesn't need any mods at all, there's enough clearance as it is.

    The 328 has the same bore diameter (84mm), so yes, you could fit the 330 pistons, but what would the purpose be? IIRC, the 330 pistons are shorter in height than the m50/52 pistons. You'd only lower the compression by fitting just the pistons.

    Regarding the crank, you can't use yours as it will have the same stroke as now. Stroke is not given by the pistons, but by crank.
    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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    #24
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    Quote Originally Posted by mistreku View Post
    Crank case doesn't need any mods at all, there's enough clearance as it is.

    The 328 has the same bore diameter (84mm), so yes, you could fit the 330 pistons, but what would the purpose be? IIRC, the 330 pistons are shorter in height than the m50/52 pistons. You'd only lower the compression by fitting just the pistons.

    Regarding the crank, you can't use yours as it will have the same stroke as now. Stroke is not given by the pistons, but by crank.
    Stroke is not given by the pistons, but by crank , I should confess that for some reason my brained is mixing stuff since i have been reading all day long about camshaft and reprofilling and ...

    in regard to the 330 pistons, i think i will increase the compression as the height is lower thus compression is increase as opposed to lowered which can be good for turbo, am i missing something?
     
     

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    #25
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    Umm, bare with me. Not a native English speaker, but I'll try to explain as clear as possible.

    If you'd replace your pistons with lower ones, while keeping the same crank and rods, you'd only be having more room from the top of the piston to the combustion chamber. You'd have the same amount of air and fuel mixture, but in a larger space.

    Look at the drawing (I know, I know, not very skilled with paintbrush, lol).

    Piston no 1 would be the shorter, 3.0 piston, and no 2 would be the longer, 2.5 piston. If stroke remains the same, the only thing you'd be changing by replacing piston 2 with 1 will be the capacity of the combustion chamber. (not exactly the chamber but I won't get into details, as I can barely explain this simple thing).

    If you have the same amount of fuel/air mixture (red stuff in the drawing) in a larger combustion chamber, that will obviously lower the compression (air will be less compressed as it's got plenty of room), as opposed to getting the same mixture into a smaller chamber, where it would have to be a lot more compressed to fit.

    Dunno if my post makes any sense to you, as I said, my English is not the best there is. Hope it helps.

    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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    MONSTER (29-09-2011)

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    Quote Originally Posted by mistreku View Post
    Umm, bare with me. Not a native English speaker, but I'll try to explain as clear as possible.

    If you'd replace your pistons with lower ones, while keeping the same crank and rods, you'd only be having more room from the top of the piston to the combustion chamber. You'd have the same amount of air and fuel mixture, but in a larger space.

    Look at the drawing (I know, I know, not very skilled with paintbrush, lol).

    Piston no 1 would be the shorter, 3.0 piston, and no 2 would be the longer, 2.5 piston. If stroke remains the same, the only thing you'd be changing by replacing piston 2 with 1 will be the capacity of the combustion chamber. (not exactly the chamber but I won't get into details, as I can barely explain this simple thing).

    If you have the same amount of fuel/air mixture (red stuff in the drawing) in a larger combustion chamber, that will obviously lower the compression (air will be less compressed as it's got plenty of room), as opposed to getting the same mixture into a smaller chamber, where it would have to be a lot more compressed to fit.

    Dunno if my post makes any sense to you, as I said, my English is not the best there is. Hope it helps.

    cheers mate, I think ur english is better than mine and the concept was very simple. I guess where i was making a mistake was that the height of the piston defines the stroke legnth and not the crank and the rod and that is why even despite ur previous response and explaining the fact, i asked a question which was based on muy wrong understanding

    thanks for taking the time but there was no need for drawing and simple English
     
     

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    mistreku (29-09-2011)

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    #27
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    You welcome!
    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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    #28
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    I have never bought a piston or ... in my life, where do u suggest to start from? what are the places that sell pistons and ... for a reasonable price and not obviously BMW which i guess will be £300 a piston or so
     
     

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    #29
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    Ebay maybe? Or breakers.. Can't find much on ebay now, but they should pop up every now and then.
    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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    #30
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    Quote Originally Posted by E36_turbo View Post
    I have never bought a piston or ... in my life, where do u suggest to start from? what are the places that sell pistons and ... for a reasonable price and not obviously BMW which i guess will be £300 a piston or so
    If I have been reading correctly...

    It will cost this for a M54 Piston out of the 330

    http://www.cooper-bmw-parts.co.uk/in...com_virtuemart

    http://www.realoem.com/bmw/showparts...25&hg=11&fg=20

    Take a look around RealOEM you will find a lot of useful info... Take the part number and put it in the part number part on the BMW Part web site


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