I want to raise the compression on my b18c5. It's bone stock with the exception of a cai. I was reading about using a stock head gasket and removing the rivets and using a layer from that.

Which layer to use? I read in one post that the outer layer is thinner then the middle... how true is that statement? Is there anyway I can calculate an estimated compression using measurements of the different layers?? I know I could do a compression test before and after but if it's not going to be significant (.2 or something) then I don't want to waste the time.

Thanks!
Frank

 

Remove the middle layer and use the two outer layers. This will raise the compression about .3.

 

it won't quite be .3 difference just by pulling the middle layer.. running a one-layer (bottom layer only) will yield closer to a .3 difference.. and remember, when torqueing with a thinner gasket you generally want to do it in more stages ( 4 or 5 opposed to 3) to insure that you're getting an even crush on the gasket..

 

actually it's really not worth doing, you won't tell much of a difference with a thinner headgasket. I've tried that route and I'm sure the gain in higher compression is there, but you won't 'feel' a good gain with a thinner headgasket. I personally think that thinner headgaskets for B-series engines are overrated.

You're better off leaving your stock headgakset alone or just buying an aftermarket one (spoon/mugen).

The best way to raise compression is either buy going GSR head on your B18C5 or changing the pistons to something that has a higher dome.


good luck.

 

or just shave your head

 

Make sure that if you get ur head milled...the person doing the work knows what he's doing.

 

Yeah I recommend the #2 Clipper

The #1 Clipper is too short and your head will be overcooled
the #2 works great

 

oh yeah you can do that, but even that has its problems. Correction of cam timing needs to be made if you mill a hea, especially when a head is milled down a lot.

 

>>Correction of cam timing needs to be made if you mill a head, especially when a head is milled down a lot.<<

Is there a general rule with regards to cam timing and milling the head or installing a thinner gasket? At what point does milling the head for more compression become detrimental unless timing is advanced?

I vaguely remember a formula with regards to advancing the timing x.x degrees for every xx thousanths milled off the head. Is there such a formula? Thanks!