when i blew the motor the other night i haven thad time to work on it until last night. when i went to take the plugs out the ones that were still in the motor were stuck i had to get a bigger ratchet and use some force to get them out. the threads had changed colors to the bluish purple kinda like headers do and the white part on the top of the plug was black like it had been burnt. i havent got the heads off yet but it also looks like the intakemanifold gasket was melted to the head. is it POSSIBLE that the bottom end is still good. when i shut the car down and it sat for awhile it still cranked over before and when i got it home it wouldnt, but i havent tried with all the plugs in.
spark plugs welded in, bottom end still good?!!!
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hotmustang331
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Doubt it...generally when engines "blow up" its the bottom end that grenades...thus the term. Now you may be able to save the crank...MAYBE, but I wouldnt look to keep anything else.
If it got THAT hot, the pistons are most likely fried...and if you had any impacts, your rods could be bent or broke. I wouldnt trust them though after they were put under any sort of stress. A stock shortblock is dirt cheap anyways....so not a huge deal.
If it got THAT hot, the pistons are most likely fried...and if you had any impacts, your rods could be bent or broke. I wouldnt trust them though after they were put under any sort of stress. A stock shortblock is dirt cheap anyways....so not a huge deal.
hotmustang331
Active Member
What exactly happened? The only way I can see the plugs getting THAT hot is from lack of oil pressure...or were you spraying when it exploded? A lean condition at that point has been known to actually melt pistons and melt the electrode off plugs....so obviously the plug would get darn hot too...possibly welding itself in a bit like you said.
So were you just driving around, going WOT or going WOT W/ spray when it let go?
So were you just driving around, going WOT or going WOT W/ spray when it let go?
i was kinda getting on it earlier than i shut it off and started it back up with in 20 mins. i was driving it easy keeping it under 2500rpm. i started hearing a skreetching noise and than it started to not go faster than it started slowing down and stallling and than it finallly just died. later i looked and it was out of coolant the radiator has a crack in it
You'll have to pull the heads and even then you can't be certain.
Pull the heads and look for scoring on the cylinder walls. If they are scored, the engine overheated badly enough to do damage to the bottom end and it will need rebuilt or replaced. When you overheat, either to pistons will grow and deposit aluminum on the cylinder walls or the ring ends will touch and cause interference.
You'll also have to inspect the top of the pistons. If they are melted or distorted, then you'll have to take things apart.
Still, checking these will not tell you for sure if the bottom end is ok or not. Your best bet is to tear the bottom end down and check all the clearances.
I can't imagine you did this damage without some very bad detonation. Did you have the car tuned after putting in the 10:1 pistons with PI heads? That kind of compression is the very upper limit of what you can do on premium pump gas, and you'd still have to back off the timing to prevent detonation.
Pull the heads and look for scoring on the cylinder walls. If they are scored, the engine overheated badly enough to do damage to the bottom end and it will need rebuilt or replaced. When you overheat, either to pistons will grow and deposit aluminum on the cylinder walls or the ring ends will touch and cause interference.
You'll also have to inspect the top of the pistons. If they are melted or distorted, then you'll have to take things apart.
Still, checking these will not tell you for sure if the bottom end is ok or not. Your best bet is to tear the bottom end down and check all the clearances.
I can't imagine you did this damage without some very bad detonation. Did you have the car tuned after putting in the 10:1 pistons with PI heads? That kind of compression is the very upper limit of what you can do on premium pump gas, and you'd still have to back off the timing to prevent detonation.
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