onephatz Posted November 10, 2004 Share Posted November 10, 2004 took my motor apart to install new arp rod bolts and this is what I found. guess I will be getting new pistons sooner than I thought. btw this was the #5 cylinder. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted November 10, 2004 Share Posted November 10, 2004 It will rev higher now, just break the rest of the pistons to match. Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted November 11, 2004 Share Posted November 11, 2004 seriously... would that even have any effect on the way the motor runs? I notice a trend of the #5 being the one that likes to hole/melt/break/crack.... stupid question I'm sure, but what is the purpose of those little 'side skirts' on the piston anyways? Quote Link to comment Share on other sites More sharing options...
wheelman Posted November 11, 2004 Share Posted November 11, 2004 Bastaad525, Think "balance" man!! Onephatz, So you think detonation busted the piston skirt like that? I guess I never would have considered that a skirt would bust due to detonation. Wheelman Quote Link to comment Share on other sites More sharing options...
Guest Cronic Posted November 11, 2004 Share Posted November 11, 2004 I don't think that was from detonation. Can you take a pic of the top of the piston? That looks like a defect in the piston, or perhaps an over-rev... Detonation usually doesn't damage the bottom of the piston w/o breaking the top. I've done something similar when I snapped a rod in my Civic turning 9500rpm, the rod just couldn't handle it, and snapped. Nothing better then a built motor, running 26psi and 9500rpm. Unfortunatly, I didnt upgrade the rods like I should have, and boom. There goes 4000 dollars. Quote Link to comment Share on other sites More sharing options...
speeder Posted November 11, 2004 Share Posted November 11, 2004 I had a set of 6 pistons that all looked just like that- It happened running 17-18 psi boost on a well-used turbo short block, no detonation. My theory is that worn out rings/ bores and increased cylinder pressure cause enough cylinder rocking to break the little tabs off. Susequently I used another stock bottom end rebuilt to specs with the same turbo setup/same boost and had no problems at all. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted November 11, 2004 Share Posted November 11, 2004 The detonation will increase the cylinder pressure and rock the pistons. Quote Link to comment Share on other sites More sharing options...
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