cracked piston #1
12-10-2009, 03:47 PM
#6
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Sorry about your problem, sounds like runaway detonation. I think you gotta monitor egt and afr constantly if you tune and produce more power. Any little thing can go wrong, could be tune, a loose maf, a loose inlet hose, bad gas, whatever; sounds like leaning out like selfinfliction said and his sig sums it up. So all of the things mentioned would cause that, bad gas or wrong octane can cause detonation; it happens qwik.
12-10-2009, 03:49 PM
#8
Senior Member
DD run more than a 1/4 mile
12-10-2009, 03:52 PM
#9
cant tune. My numbers are not lower than yours and I have a TVS. BUT if something goes wrong it can blow up no matter how good the tune....you and I both know that....Area still running at 90k miles says something. And you only ran into trouble when you started making impossible whp numbers DD run more than a 1/4 mile
DD run more than a 1/4 milebut yeah, I know that quite well $7k down the drain on a motor that stayed together for 5 weeks. damn shooting for 550+whp. and hey I dd'd my car, even drove that poor thing to canadia
12-10-2009, 03:57 PM
#10
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back to the track...
12-10-2009, 04:52 PM
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that's great lol
12-10-2009, 09:04 PM
#15
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how's your intercooler pump? since you got the zzp s3, i've been doing a looot of reading and some ppl suggest adding much more fluid to the intercooler system can strain the pump, especially if undue piping is in the system and the fluid has to go against gravity a lot of the time. just a suggestion... but as most suggested, piston crack = excess heat.
some ppl would say, "if it aint broke, don't fix it." i agree. i also agree that "if it's broke, fix it better"
and yes, forged pistons can withstand more heat... and detonation occurs when lean, but detonation also causes pulse waves of cumbustion too early in the power cycle, causing forces to be applied to the piston BTDC which causes undue and unnecessary force on the piston, rod & crank. this can crack it as well.
some ppl would say, "if it aint broke, don't fix it." i agree. i also agree that "if it's broke, fix it better"
and yes, forged pistons can withstand more heat... and detonation occurs when lean, but detonation also causes pulse waves of cumbustion too early in the power cycle, causing forces to be applied to the piston BTDC which causes undue and unnecessary force on the piston, rod & crank. this can crack it as well.
12-11-2009, 01:38 AM
#16
it ran well damn straight it did! mine at 300+is kewl, like for thousands of miles until I was on the track one day and the maf pulled out of the inlet air box and it went 19:1 for a nanosecond...now fixed and fine now. I am wondering what if I stayed off the road race track? then I said Why? fixed the MAF.... back to the track...
back to the track...
12-11-2009, 01:26 PM
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i have a hole in my #1 piston also and yes i have the tvs also lol. but im working on it right now with a friend of mine and we arent sure what cause it either. also part of the spark plug in that cylinder was missing. im hoping my coolant pump didnt go bad but if that was the case wouldnt it happen more things than just one piston?
12-11-2009, 01:37 PM
#19
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i have a hole in my #1 piston also and yes i have the tvs also lol. but im working on it right now with a friend of mine and we arent sure what cause it either. also part of the spark plug in that cylinder was missing. im hoping my coolant pump didnt go bad but if that was the case wouldnt it happen more things than just one piston?
Lean is probably the thing that happened to lead to the runaway detonation. Tuning is the #1 reason.
In my case it was not the tune , but a physical leak at the maf. Like an 1/8 of an inch leak. It didnt go pop, it went soft at 7500 in 5th gear on the race track as I looked in the rear view to check that the 911 i was running with was in fact lot smaller
then I slowed down, pretended I was a WRX going to the pits; the 911 passed me back. i went to the pits, pulled the plugs, cried for a nanosecond and loaded up to go home...
12-11-2009, 04:10 PM
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but after that happened i realized that what i thought was just an idle problem cause of the meth was probably just a small piston hole getting worse and worse. plus about a week before it completely efd up i noticed that i lost about 7psi of boost so im assuming that it just got worse gradually until it as you put it got completely F****D!
12-11-2009, 06:08 PM
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yeah didnt run it for long lol, it sounded like a go kart and idled really wierd i just drove it the mile or so back to my friends house.
but after that happened i realized that what i thought was just an idle problem cause of the meth was probably just a small piston hole getting worse and worse. plus about a week before it completely efd up i noticed that i lost about 7psi of boost so im assuming that it just got worse gradually until it as you put it got completely F****D!
but after that happened i realized that what i thought was just an idle problem cause of the meth was probably just a small piston hole getting worse and worse. plus about a week before it completely efd up i noticed that i lost about 7psi of boost so im assuming that it just got worse gradually until it as you put it got completely F****D!
Hey dustin... what did i tell you? Seems everyone else says the same thing i told you but you wouldnt seem to believe me..
12-11-2009, 10:17 PM
#23
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Its hard to bring yourself toaccept your motor blew up. The ring lands are probably collapsed, I doubt there is a hole in the piston but its possible. Strip, hone new pistons at best. Strip re sleeve, new pistons next. Or cheapest route, 1500 used motor and try again...
12-12-2009, 12:01 AM
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Hey dustin... what did i tell you? Seems everyone else says the same thing i told you but you wouldnt seem to believe me..
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also tom said he was having trouble with knock and he had a very conservative tune on it. he said he thinks that it being "weekend and stressed" <quote.. at the time caused the knock and then like i was saying it just gradually got worse into a hole.
12-12-2009, 02:19 AM
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easy Shaeffer....ez....Schaeffer?.... SCHAEFFER! Its hard to bring yourself toaccept your motor blew up. The ring lands are probably collapsed, I doubt there is a hole in the piston but its possible. Strip, hone new pistons at best. Strip re sleeve, new pistons next. Or cheapest route, 1500 used motor and try again...
Its hard to bring yourself toaccept your motor blew up. The ring lands are probably collapsed, I doubt there is a hole in the piston but its possible. Strip, hone new pistons at best. Strip re sleeve, new pistons next. Or cheapest route, 1500 used motor and try again...
..