How much can I safely take off my head on my dohc zc to up the compression, I have read .8mm for 10:1, and 1.4mm for 10.6:1. I was hoping someone can verify this and let me know if it is safe!

Thanks!!

Ryan

 

not sure what is safe but your gonna need Adj. cam gears or your timing will be fubar'ed.

 

bump...im interested too

 

Clay the stock motor and see how much clearance you have now, then mill away with your new found knowledge. I would advise stronger valve springs just in case one of the valves wants to get personal with a piston relief.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hollywoood &raquo;</TD></TR><TR><TD CLASS="quote">How much can I safely take off my head on my dohc zc to up the compression, I have read .8mm for 10:1, and 1.4mm for 10.6:1. I was hoping someone can verify this and let me know if it is safe!

Thanks!!

Ryan</TD></TR></TABLE>
we took .040" off the block and .080" off the head - with Crespo stage 4 cams and 88-89 Integra head gasket it still has plenty of clearance - compression ended up about 14:1

 

I run a machine shop with my pops...
Maybe you can get the shop to grind off what you want on a surface grinder.
The finish will be ALOT better then milling it, Parts I do on my Brown and Sharpe grinder basically come out looking like a mirror...should help the gasket seal better, dont know if its been done cuz everyone talks about milling it.

For an example of surface grinding....
All flat surfaces where surface ground...The outside diameter i did on a OD Grinder...63 Rockwell hardness was a bitch to grind! The pockets where done on my HAAS VF4 CNC
BTW...These parts are for a 1000 Ton press...kind of like tooling for it
3 parts come together to make the bottom and 3 come together and make the top...then the two sections come together and each flat surface makes up one side of a cube when everythings together.
I know its some complicated ish...
FYI These presses are used to crush rocks and stuff for scientific research...I know one guy in Sweden uses heating elements and makes synthetic diamonds with it

 

youd probably be safer welding the CC's, you wont have to worry about claying the motor and you wont have to worry about upgrading cams.

 

I have done 1.1mm from the surface, and it worked very good.

Just set the timing little bit. And it would be best if you have camgears.

 

surface grinding is very clean and extreemly flat. I used it to make a small die recently. but i've never seen one do aluminum? do you just change the wheel?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">surface grinding is very clean and extreemly flat. I used it to make a small die recently. but i've never seen one do aluminum? do you just change the wheel?</TD></TR></TABLE>

Nah i use the same wheel I use on everything else i grind (420 SST, H13, S7,P20),
You just have to be light on the cuts and use alot of water...A little trick of the trade...take a piece of wax ( even candle wax) and sort of coat the wheel with it after you dress the wheel...The wax fills in the pores of the wheel so that the aluminum dosent gunk it up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Newark Built Kandy SiC-RX &raquo;</TD></TR><TR><TD CLASS="quote">Nah i use the same wheel I use on everything else i grind (420 SST, H13, S7,P20),
You just have to be light on the cuts and use alot of water...A little trick of the trade...take a piece of wax ( even candle wax) and sort of coat the wheel with it after you dress the wheel...The wax fills in the pores of the wheel so that the aluminum dosent gunk it up. </TD></TR></TABLE>