SuperMex Posted July 15, 2011 Report Posted July 15, 2011 Currently replacing my topend and pulled cylinders off and seen this on right side piston dome is it from a lean condition or detonation? Right side piston Left side piston trashed Quote
87custom Posted July 15, 2011 Report Posted July 15, 2011 Currently replacing my topend and pulled cylinders off and seen this on right side piston dome is it from a lean condition or detonation? Right side piston Left side piston trashed mint dude Quote
SuperMex Posted July 15, 2011 Author Report Posted July 15, 2011 No it wasn't on a new top end I was at 90psi in both and I knew it was only a matter of time just waiting for it to go so I can build my 10mil cub now. I would be pissed if it was new though. Quote
SuperMex Posted July 15, 2011 Author Report Posted July 15, 2011 How could it be detonation if it was only 90psi ? is there other ways other than running too high compression and too low octane? Quote
EvilBanshee Posted July 15, 2011 Report Posted July 15, 2011 How could it be detonation if it was only 90psi ? is there other ways other than running too high compression and too low octane? If you have your timing cranked up alot and you run regular, it coulllllld detonate.. Quote
EvilBanshee Posted July 15, 2011 Report Posted July 15, 2011 ps those white chunks on top are pieces of aluminum. Id say you got shitty fuel. Quote
SuperMex Posted July 15, 2011 Author Report Posted July 15, 2011 I'm running 50/50 110 and 93 and +4 timing so not to advanced on the timing must have been a bad batch of gas Quote
SuperMex Posted July 15, 2011 Author Report Posted July 15, 2011 Oh and it was only the right side piston dome that was pitted like that Quote
shanYE west Posted July 15, 2011 Report Posted July 15, 2011 looks to me like a motor that was ran with too little oil. Quote
Coupelx Posted July 15, 2011 Report Posted July 15, 2011 all the octane in the world wont help an air leak causing a lean condition. the scuffing could be related to a very hot cylinder from the lean condition or cold siezing. Quote
BrockMoto Posted July 16, 2011 Report Posted July 16, 2011 When mine looked like that it was deto... Caused by super lean conditions Quote
BrockMoto Posted July 16, 2011 Report Posted July 16, 2011 When mine looked like that it was deto... Caused by super lean conditions Quote
EvilBanshee Posted July 16, 2011 Report Posted July 16, 2011 x2 on the too little oil maybe??... hard to say. how is the rod bearing? Quote
Jereme6655 Posted July 16, 2011 Report Posted July 16, 2011 Cold seize is when you don't allow the motor to warm up before beating on it........it can real havoc on your pistons...... Quote
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