I'm pulling my H22 head off of my H23vtec to have the valves done. While it's off, I was thinking of milling it. Does anybody know about how much compression is gained per thousandth(or per ten-thousandth is probably safer) milled off? I don't want to get too crazy either so what is the most that is safe to take off?

TIA

 

that's cheap compression, do it the right way

 

do it the right way... just incase u change ur mind.. u could change compression... milling the head is something u cant change.. once its done its done...

 

every .010" will increase your compression about .2 I've shaved .030" which is still fairly mild. As long as you are running the h23 tensioner you'll be fine but when you start milling heads with the h22 auto tensioner problems arise.

 

why not use a thinner hg. Milling is soo permanent.

 

Just take the center layer out of your head gasket. Or raise the compression the right way: with pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">Just take the center layer out of your head gasket. Or raise the compression the right way: with pistons.</TD></TR></TABLE>
Taking out the center laer will only raise the compression .15 of a point which is not noticable. Also to say that the only "right" way to increase compression is with different pistons is completely false. That gives in to the misnomer that once a head is milled it is junk. Well, maybe if that head is milled .100" then that would be true. But an inexpensive yet effective way to increase compression is by milling the head. .030" is nothing a manual tensioner can't take care of; neither is .040", yet the compression will be increased by over a half point by doing this. Also, if the head warps in the future due to overheating, it can most likely be straightened again depending on the amount of warpage.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicsitek GanGsTa &raquo;</TD></TR><TR><TD CLASS="quote">
Taking out the center laer will only raise the compression .15 of a point which is not noticable. Also to say that the only "right" way to increase compression is with different pistons is completely false. That gives in to the misnomer that once a head is milled it is junk. Well, maybe if that head is milled .100" then that would be true. But an inexpensive yet effective way to increase compression is by milling the head. .030" is nothing a manual tensioner can't take care of; neither is .040", yet the compression will be increased by over a half point by doing this. Also, if the head warps in the future due to overheating, it can most likely be straightened again depending on the amount of warpage. </TD></TR></TABLE>

Why not just weld the chambers on the head.

Milling and high compression dome pistons just leave you with less room for errors.

 

Welding the chambers is another option but also more expensive....quite a bit more.