hi HT guys! im planning to mill my itr head to bump my compression up. im currently using jdm itr motor with skunk2 stage 2 cams and valvetrain. how much would i mill off the head. i want my compression to be approx 12:1.
any suggestions other than milling the head would be appreciated. thankS! more power.

 

dont do it... i wouldnt mill my itr head, but its your call. there might be another way to achieve you goal. High compression pistons and valves or something. thin head gasket. I've heard of people having their **** fucked up because of bad milling.

 

there was a guy on here the other day talking about using the oem headgasket and taking it down to one layer to raise compression. search around or ask someone that has done it but that doesnt seem like a half bad idea to me.

 

Once your head is milled, it's a irreversible process. If you want to bump up the compression just a little bit, then get a thinner headgasket from TODA Racing. If you want to pump it all the way up, then using high compression pistons is the only way to go. If the head is milled, you'll need adjustable cam gears to set back the correct cam timing.

 

i think the figure is for every .10 thous its.2 in comp if i rememebr right...

i had a built PR3 head milled 40 thou....

 

why pay for the toda gasket, thats like $175, you can just remove the layers and put the copper gasket maker on the oem hg.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boy_hapon &raquo;</TD></TR><TR><TD CLASS="quote">hi HT guys! im planning to mill my itr head to bump my compression up. im currently using jdm itr motor with skunk2 stage 2 cams and valvetrain. how much would i mill off the head. i want my compression to be approx 12:1.
any suggestions other than milling the head would be appreciated. thankS! more power.</TD></TR></TABLE>

you wouldnt want to mill that much off, not for a street motor...

I would rec replacing your pistons, BUT you could mill like .010-.020 and run a one layer gasket w/copper spray...that'll give you a better noticebly power difference caused by the better quench....

Just remember you're gonna have cam gear timing retardation if you do, do this. It would be necassary to compensate with a dyno tune to gain the most power from the work done to the head....

 

So thats how these dudes are running a 1 layer HG, they have to retard the cam timing huh? i figured youd have to do something like that so your valves dont slap the pistons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2000turbogsr &raquo;</TD></TR><TR><TD CLASS="quote">So thats how these dudes are running a 1 layer HG, they have to retard the cam timing huh? i figured youd have to do something like that so your valves dont slap the pistons. </TD></TR></TABLE>

no..

reread my statement..

 

okay, my bad.... i read it too quick. but i do get it now. thnx

 

thanks for the replies. initially i planned o using a think head gasket and flat faced valves but my tuner advised me to stay away from those flatfaced valve coz they become unstable at high rpm and the dish valves flows better than those.
so most of you recommend not to mill the head, i'll take that into consideration. i hope to get more inputs. thanks!