I'm going to be using OEM ITR cams with new GSR intake springs on the exhaust side, but otherwise everything on the head and block will be stock. I'll use a OEM B18C1 head gasket too.

I want to bring up the compression ratio from the stock 10.0:1 to around 10.8:1, maybe a touch higher, but I am concerned about having problems due to contact/interference issues when advancing or retarding the cams with cam gears.

What has been done with success (and if anyone has any horror stories about damaging a motor with too much cam advance or retard on the dyno, I guess that would be useful info too).

Thanks in advance.

 

Anyone? or is this in the wrong forum (I figured it is definitely Integra related . . .)

 

0.020 is safe. More than that requires machining your valve pockets on your pistons to maintaim proper p to v clearance especially with big cams.

 

I'd purchase some JDM ITR pistons and slap them on. I'd think it would be cheaper than having the head machined. Plus you get pistons with the molybdnium coating on the skirts. Less resistance means more power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">0.020 is safe. More than that requires machining your valve pockets on your pistons to maintaim proper p to v clearance especially with big cams.</TD></TR></TABLE>

Thank you. Can you approximate the C/R gain from the stock 10.0:1 that would gain me?

 

I don't believe that milling the head is a good way to increase compression. Sure it gets it done, but my biggest problem with it is that it retards your cam timing and leaves the t-belt too loose. I believe CTR pistons would give you a higher CR than the JDMITR, but not positive.

 

0.020 is like 0.5+ CR roughly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kchungb17a &raquo;</TD></TR><TR><TD CLASS="quote">I don't believe that milling the head is a good way to increase compression. Sure it gets it done, but my biggest problem with it is that it retards your cam timing and leaves the t-belt too loose. I believe CTR pistons would give you a higher CR than the JDMITR, but not positive.</TD></TR></TABLE>

I understand your position, and I agree. I'm leaving the block and pistons alone, not messing with that, but since I'm paying for headwork, milling the head is "free," so to speak. That is the reason I'm considering taking a little off the head.

Wouldn't it possible to address the cam timing issues with a modified head by using adjustable cam gears (which I have purchased and plan to use)?