i was driving on the turnpike the other day racing and i was going 125 at about 5000 rpm's and since i was ahead by alot i let off the gas and got off the turnpike to pay my toll and i noticed that my car was running funny so i went home and got out it sounded like a dirt bike. so i took out the spark plugs and 1 of them was melted preety bad and now it runs on 3-cylinders. the one with the problem has 0 compression and the other 3 had a compression reading of 120. i heard no noise b/c i have no radio in the car. anybody ever heard of this before?

you have big problems my friend.

do u know what might have happened?

you could have melted a pistin at worst, ruined your valves at medium, or blown the head gasket (unlikely because of the melted sparkplug) at best. 0 compression means its shot and you need an engine rebuild. At 120psi for the rest you are at the service limit anyway, thats pretty low, my gsx runs about 170psi across and most people average 155-175

how many miles do you have and how long were you at 5krpms? do you do that ofter? sounds like you stressed the motor and killed a piston or some valves

I highly recomend a new motor.... ya that sounds about right.... I would tell you not to drive it but its already so fu3ked.

that sucks man but you need a new motor or rebuild

you 'bout killed it man...sucks to be you but it's not gonna be a cheap fix either with a rebuild or a new motor

If you rebuild take it as far as you can afford cause youll only want to do this once!

the car has 133k miles on it and the guy who i bought it from said that they had rebuilt it from the bottom up about 10k miles ago. i wasn't at 5k for long, maybe a second or two and when i felt something wrong i let off the gas. i usually try not to beat on it but it happens:). if i did melt a piston, which brand should i go with?

ORIGINAL: 93eclipsegsx

the car has 133k miles on it and the guy who i bought it from said that they had rebuilt it from the bottom up about 10k miles ago. i wasn't at 5k for long, maybe a second or two and when i felt something wrong i let off the gas. i usually try not to beat on it but it happens:). if i did melt a piston, which brand should i go with?


i have a feeling that the engine wasn't properly broken-in after the rebuilt.

CP and Wiseco are great companies to look into for pistons

yeah, i bought it from a kid whos 19 and his older brother told me that he had beaten on it ever since. should i just replace just the one piston or replace them all, and go out and buy a 6-bolt and build it up and swap it in after im done with it? since i have a evoIII 16g turbo on it, could it have been the turbo that caused it?

ORIGINAL: 93eclipsegsx

yeah, i bought it from a kid whos 19 and his older brother told me that he had beaten on it ever since. should i just replace just the one piston or replace them all, and go out and buy a 6-bolt and build it up and swap it in after im done with it? since i have a evoIII 16g turbo on it, could it have been the turbo that caused it?


i would first get the engine open to see how much damage has been caused. from there, you can evaluate your options.

whether the turbo could have done it, it could....depending on the size of the turbine inlet. an inlet that is too small can cause backpressure and tons of excess heat, which could cause something like this.

i bet the rings didn't properly get seated since he started beating on it from the time he got the engine rebuilt.

the inlet size is that of a 16g. if that helps.

i have no idea how big that is.

anybody know the A/R of the turbine in a 16G(small or big)?

http://www.extremepsi.com/store/customer/product.php?productid=16296&cat=0&page=1 that is the exaxt turbo i have if that helps.

ORIGINAL: 93eclipsegsx

http://www.extremepsi.com/store/customer/product.php?productid=16296&cat=0&page=1 that is the exaxt turbo i have if that helps.


i think thats a .60A/R so that would not have caused a problem.

could it ave been that i got it real hot and melted the plug and put a hole in the piston?

What engine is in there already? Is it the 4G63? If so then I'd go with a 6 bolt buildup. If you melted the piston then who knows what other damage has been done to the block...

the engine it in is the factory engine from 93.

'93.... They didn't have the 420A's then did they?

ORIGINAL: Sanguinius

'93.... They didn't have the 420A's then did they?


nope...but looking at his member name...i am going to assume that he has a '93 GSX.

God I'm slackin good call I bet he DOES have a GSX lol

yes i do have a 93 gsx. :). so i pulled the head off today and it is indeed an exhaust valve. a piece cracked off and i cant find it. could it affect the turbo?? or would it just go right out the exhaust and be gone? what could cause the valve to crack? to much pressure or was it bad in the first place? if you guys want to see a pic of it let me know.

There are plenty of things that could cause the valve to crack and chip. The timeing may have been off a tooth, weaknesses in the metal, something getting into the cylinder and hitting that valve before exiting. Who knows. Before you go putting everything back together make sure to get the head warp, crack, and compression tested, as well as getting the block checked for warping on the head gaskete surface. Sounds like you MIGHT have lucked out but check the turbo and exhaust piping thoroughly for that valve piece. If it DID exit through the turbo it could be problems as it MAY have damaged fins. if it made it through it could also cause damage to the cat. Go through things with a fine tooth comb.

it wouldnt have have done anything to the cat because i dont have one. and i still pass emissions,:). i hope its not the turbo because ive only had it for about three days before this happened. we checked the timing and it looked good, the notches lined up right.