Hi, I disassembled a M20 engine and found these pistons with rods, Can someone help me identify these. I have one piston crown that is cracked and need a replacement Thanks Sent from my iPhone using Tapatalk
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M20 Piston identification 85mm Bore
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kinda look like these CP, just guessing though
http://www.tmwerkes.ca/the-convertib...roker-project/89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by digger View Postkinda look like these CP, just guessing though http://www.tmwerkes.ca/the-convertib...roker-project/
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contact CP with the code printed on them and see if its one of theirs89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Could be these
If you’re ready to add some substantial horsepower to your M20 engine, this BimmerHeads stroker kit is the only logical choice! Combine this stroker kit with one of our BimmerHeads Super Sport or Race cylinder heads for some impressive power numbers! This kit is available in a variety of options which are selectable fr89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Is that like sand blasted texture? Probably knock with a bunch of pre-ignition
the answer is a bad tuneup and a knock prone piston designLast edited by digger; 01-07-2020, 11:18 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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There's hardly any angular squish on those pistons - and they have a flat center, not a spherical dish. The m20 is a "knock-resistant" design so they could run leaner than most engines. The angled edge of the OEM piston swirls the combustion gasses towards the spark plug. When the squish band isn't used properly, the combustion can pre-ignite and knock.
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The picture above looks quite a bit different in terms of colouring to the first post. Are they the same engine? Almost looks oily89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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The pocket edge is already machined back it’s not burnt away89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Yeah, but look at the original crown, by the intake valve pocket- I see signs of detonation right over the ring land.
OP, I'd ditch all six, based on the 2 crowns you show, and get something that's better suited...
sorry,
t
has broken pistons due to detonation, too.now, sometimes I just mess with people. It's more entertaining that way. george graves
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