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Old 10-19-2006, 09:46 AM   #1 (permalink)
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3 angle valve job and head milling

I am currently doing a JDM engine swap in my 5gen and will be swapping over the old (recently rebuilt) head from my old engine. It has a 3 angle valve job done by yours truly, and it was milled by a machine shop. I do not know how much it was milled, all I know is that it was warped. I am curious to know how much extra power this head will provide my JDM H22A. With a "typical" head milling, if you will, what kind of compression ratio might I achieve? Also, will there be any issues with compatibility between the blocks of the H22A and the H22A4 (closed deck v open deck)? Thanks!
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Old 10-19-2006, 10:22 AM   #2 (permalink)
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Probably not much. My head was milled over the summer after a head gasket failure, but if they were not aiming for performance, then I'm sure they took as little as possible off. Just enough to get a clean even surface.
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Old 10-19-2006, 10:40 AM   #3 (permalink)
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The increase in CR depends on the amount milled. You'll have to calculate it. "Typical" head milling to clean the surface and elimiate any warping is going to be around 0.005" or less. That will have a negligible effect on the CR.
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Old 10-19-2006, 11:29 AM   #4 (permalink)
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okay well that's a little disappointing, but what about the three angle valve job? How much (assuming it will) power will that yield over a stock valve grind?
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Old 10-19-2006, 11:47 AM   #5 (permalink)
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The stock seats are cut similar to a 3 angle valve job, so not much difference. We usually do a 3 angle on the intake and radius on the exhaust for what it's worth.
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Old 10-19-2006, 01:37 PM   #6 (permalink)
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well damn I guess I just can't win. will there be any compatibility issues between the two heads (H22A vs H22A1)?
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Old 10-19-2006, 02:05 PM   #7 (permalink)
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^nope. both closed deck design.

but in your first post you asked about a A4 (which is obd2) but even then it will work. you just have to use the right head gasket
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Old 10-19-2006, 03:07 PM   #8 (permalink)
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Quote:
Originally Posted by petern101
^nope. both closed deck design.

but in your first post you asked about a A4 (which is obd2) but even then it will work. you just have to use the right head gasket

What do you mean, specifically? I just ordered a head gasket for the H22A4 motor. I am using a H22A block (w/ the appropriate sensors and such swapped for OBDII complaince) and a head from the H22A4. Did I get the right gasket?
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Old 10-19-2006, 03:44 PM   #9 (permalink)
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^yes. if you are using an open deck head, use the open deck gasket. its just you put A1 and it confused me.
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Old 10-19-2006, 04:25 PM   #10 (permalink)
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my bad, thanks for the help. Now, if this ES motor mount insert would fit correctly... sonofa.



edit: so that's what they mean by "inserts". I need new motor mounts now...

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