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.
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?
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.
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?
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.
thanks for taking the time but there was no need for drawing and simple English
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
Ebay maybe? Or breakers.. Can't find much on ebay now, but they should pop up every now and then.
It will cost this for a M54 Piston out of the 330
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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