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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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#1 |
Join Date: Mar 2012
Location: Gilbert Arizona
Age: 31
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Cosmetic HeadGasket
Ok so a friend told me these gaskets didn't seal very well.
has anyone ever used one and what were the results leme know please thanks |
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#4 |
Zilvia FREAK!
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Thats actually the requirement if you want it to seal properly. |
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#5 | |
kouki man
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Location: downtown oakland,ca
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Quote:
like he said. metal headgasket wont forgive any perfections from the surface. it is adviceable to get the surface milled have a flat surface. if you want it to seal properly you can try to use a copper spray gasket maker and decked it. |
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#8 |
Join Date: Mar 2012
Location: Gilbert Arizona
Age: 31
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Alright thanks guys im gonna check the surface of the head and block..
Not wanting to pull the block just to resurface it, how well does this copper spray seal? I had a metal head gasket on before replacing because i read shit numbers on compression test.. cyl#1 30.. the other 3 150 just gonna switch gaskets and see if it fixes my problem |
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#9 |
Nissanaholic!
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I've had 2 cosworths..never resurfaced block, just the head. No problems. (Using copper spray) I actully reused one in my motor and later ended up making 400whp..of course I don't own the car anymore so don't know how the motor is doing.
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#10 | |
Join Date: Mar 2012
Location: Gilbert Arizona
Age: 31
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Quote:
do you know any difference in the two gaskets like what would make one better than the other |
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#14 | |
Man w/ CTSV & a Car Seat
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#15 | |
Premium Member
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Location: torrance, ca
Age: 43
Posts: 12,686
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#16 |
Zilvia Addict
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To be honest, I've had two cometic head gaskets and both of them were blewn on my KA, but I can't blame them because I never resurfaced the block and I think it also had to do with the tune(timing). Know I resurfaced both and did firerings to the block also. I'm gonna try it for the last time with the cometic if I have problems again then f** it lol. As soon as I finish with my rebuild and retune I'll let you guys know.
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#19 | ||
Premium Member
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Location: torrance, ca
Age: 43
Posts: 12,686
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#20 |
Zilvia Addict
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Because before the first time it happened the car overheated in the break in, but then the car was good and I dynoed it with 33 passes and did 404hp, after that the car was still perfect. Then when I tried in the street draging with two cars from 1st to 4rth gear it blew it. So I though it was by cause of it because after it when I was rebuilding it the head was very bad, so I resurfaced it, but I didn't resurface the block. I finish rebuilding, I break in it, then at dyno when the tuner is working with the timing in one pass it blew it again when reaching 368hp. When I was rebuilding it I noticed that the first pinston had the compresion rings sticked inside it and the rod was purple at the top and the piston had shrunk a lil bit. Non of my friends ever had problems with cometics and they always use them. One of them has a KA-T with 550hp and the other one has an SR with 600hp, and everyone else has high hp also and still no issues.
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