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Old 04-11-2013, 02:19 PM   #1
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Default Head. Not the good kind.

felpro gasket. what's the reason for that crappy finish to chip off?
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Cleaned up a little after removing the head gasket.




Is this from detonation?
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Old 04-11-2013, 03:00 PM   #2
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That coating just sticks and then it pulls off when you remove it.

You weren't planning on reusing the headgasket were you?
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Old 04-11-2013, 03:02 PM   #3
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Yup, that's normal.
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Old 04-11-2013, 03:36 PM   #4
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No I pulled it cause 4th cylinder was leaking coolant I'm guessing from that spot. The pieces missing were nowhere to be found and not stuck to the head or block.
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Old 04-11-2013, 03:55 PM   #5
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You blew your head gasket, lol
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Old 04-11-2013, 10:39 PM   #6
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Quote:
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You blew your head gasket, lol
no ****. I've never seen a coolant passage get blown out like that. Was curious if there is anything i should do differently since I only have 150 miles on that headgasket after a rebuild. Torqued my arp studs to 65 ft/lbs per general consensus on the arp head stud thread/flying miata. Head and block are machined and within spec.
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Old 04-12-2013, 12:41 AM   #7
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possible your coolant system had air pockets still, under boost this could lead the HG failure.
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Old 04-12-2013, 01:32 AM   #8
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Hello everyone....

Last edited by Amellrotts; 04-12-2013 at 01:39 AM. Reason: I made a stupid comment....
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Old 04-12-2013, 02:02 AM   #9
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Is there a different finish between #4 and the back of the head?
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Old 04-12-2013, 02:08 AM   #10
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Quote:
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possible your coolant system had air pockets still, under boost this could lead the HG failure.
thank you. this is more along the lines of what I was looking for. If what you say is possible and correct this could have very well caused it. I let it run for a while and burped it but my reservoir needs to be replaced and I wouldn't be surprised if it sucked air.

I've only seen head gasket failures from overheating. I don't doubt there are other possibilities like detonation. Has anyone else had personal experience or seen this on their car?
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Old 04-12-2013, 02:10 AM   #11
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Is there a different finish between #4 and the back of the head?
yeah curly some chump at the machine shop lightly scratched the head on the back so it was cleaned up with a very fine stone. It is in good shape and perfectly flat. I trust my machine shop guy and any other machine shop guys can chime in here and hopefully back that.
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Old 04-12-2013, 02:15 AM   #12
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Quote:
Originally Posted by krissetsfire View Post
thank you. this is more along the lines of what I was looking for. If what you say is possible and correct this could have very well caused it. I let it run for a while and burped it but my reservoir needs to be replaced and I wouldn't be surprised if it sucked air.

I've only seen head gasket failures from overheating. I don't doubt there are other possibilities like detonation. Has anyone else had personal experience or seen this on their car?
yes I've seen it on a perfectly assembled and perfectly running car.

replaced it and it ran like a champ. absolutely nothing else was done, just a simple swap.

So yeah, like I already said nothing looks outa the ordinary, check everything over replace and try again
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yeah curly some chump at the machine shop lightly scratched the head on the back so it was cleaned up with a very fine stone. It is in good shape and perfectly flat. I trust my machine shop guy and any other machine shop guys can chime in here and hopefully back that.
you mean just that one part? EWWW

I don't care what the guy says, I'd still be very very paranoid about that
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Old 04-12-2013, 02:36 AM   #13
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I was so I had my uncle who is a retired calibrator for raytheon measure it. He gave it his approval and since he calibrated machines making missile parts and such for 30 years i trust him too.

Also my machine shop guy is a very honest and precise guy. because of it he charged me nothing and promised if I had problems he would replace and install it at no charge. Said he would put it on his car even and not think about it. Edit: also the stone marks are not just in that spot they are all over. It's across the whole head. The head was warped slightly when i took it in and he took it down accordingly.

Im trusting what you said about replacing it and being fine I just wanted to show pictures to see if anyone else had any similar experiences.
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Old 04-12-2013, 05:15 AM   #14
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I've used one of those stones before. For a lot of stuff. You could use it for 24 hours straight on a head and take of maybe .001 or .002" max. They do nothing. You'd have a mirror finish by then though. That's probably why it looks discolored.
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