Which Head Gasket?
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Which Head Gasket? - Urgent
Ok, so i just replaced my head gasket after a rebuild and its still leaking. I have cp pistons 10.5:1 and stock length Eagle H rods. I was going for decent compression and will turbo it eventually. I'm going to get the head shaved a little to ensure its not warped. However anyone know if the piston valve clearance would be ok with a .030 head gasket.
These are my choices I am trying to decided from. Any input/advice would be great.
Nippon Cometic
.027
.030
.036
.040
.045
.051
.060
Modified by doublejz at 10:52 AM 8/4/2005
These are my choices I am trying to decided from. Any input/advice would be great.
Nippon Cometic
.027
.030
.036
.040
.045
.051
.060
Modified by doublejz at 10:52 AM 8/4/2005
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From: 12.88 at 106.89 N/A
all of this info is from an H22, but should be close.
stock head gasket is .030
if you shave the head, or put a thinner gasket in it you will do 3 things
1 raise compression which you knew about, every .010 you take out on an H22 gives you about .04:1 more compression (10.6:1 to 11:1)
2 bring pistons closer to valves, you shouldn't have to worry about this, just take some calipers and set them to .020 this is more than you will take out, and it is such a teeeeneeeey space that if your valves were that close stock, honda was crazy. you should be okay
3 this you probably didn't think about : you will be taking distance out from between the crank and the cams, so your cams will be slightly rotated since the belt that connects them is ribbed and meant for an exact stock head thickness. from my calcs (i'm an engineering sophomore at purdue who got a perfect geometrical reasoning score on the SAT with a 710 in math) if you take .015 off of the distance, you will be between 1/2 and 2/3 of a degree off. so with more than .010 shaved or taken out of the head gasket you'll have to get cam gears and advance the cams to get them back to stock timing.
good luck, i'd get the stock thickness and shave the head. i'd actually get a stock gasket from honda, since the cometics take so long to ship unless you can find someone who stocks them (they make them one at a time per order since there are so many different combinations (they do different bores too))
stock head gasket is .030
if you shave the head, or put a thinner gasket in it you will do 3 things
1 raise compression which you knew about, every .010 you take out on an H22 gives you about .04:1 more compression (10.6:1 to 11:1)
2 bring pistons closer to valves, you shouldn't have to worry about this, just take some calipers and set them to .020 this is more than you will take out, and it is such a teeeeneeeey space that if your valves were that close stock, honda was crazy. you should be okay
3 this you probably didn't think about : you will be taking distance out from between the crank and the cams, so your cams will be slightly rotated since the belt that connects them is ribbed and meant for an exact stock head thickness. from my calcs (i'm an engineering sophomore at purdue who got a perfect geometrical reasoning score on the SAT with a 710 in math) if you take .015 off of the distance, you will be between 1/2 and 2/3 of a degree off. so with more than .010 shaved or taken out of the head gasket you'll have to get cam gears and advance the cams to get them back to stock timing.
good luck, i'd get the stock thickness and shave the head. i'd actually get a stock gasket from honda, since the cometics take so long to ship unless you can find someone who stocks them (they make them one at a time per order since there are so many different combinations (they do different bores too))
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