how do you raise compression on a Ls motor using head gaskets?
will the .043 raise it higher or .065? Also how much of a gain in performance and cr will I get with the .043 over the .065? What is stock at? thanks
dont do that. if you want to raise compression get new pistons.
milling the head or using thinner gaskets puts slack in your timing belt…not a good idea. beside you wont notice it that much. the slck in the belt from a thin gasket wont be so bad but if you talk to a couple motor heads they dont suggest it
jim
I was thinking about increasing the CR with the copper head gasket, but everyone finally told me that its a bad idea. You need to have rubber gasket seals to properly seal the head to the block using the copper. The stock head gasket thickness is .075 mm. If you take out one of the layers from the stock head gasket you can gain CR that way but I wouldn’t trust that. Just do what crash said and what I’m doing. Get higher CR pistons. Its more reliable and you don’t have the tihng in the back of your head reminding you that your crap might fail on you. I also don’t suggest milling. Its a cheap easy way, but its not worth it IMO. You will have the slack, but the gains are not that good and you have to worry about the valves hitting the pistons if you go too much. Just get the pistons. I’m getting the JE pistons that are 10.5 cR compared to the 9.9CR for my b20 block.
im thinking of using a spoon head gasket , it slightly raises the compression , and since honda and spoon are so close like mugen i kinda trust there stuff over other brands for head gaskets
Spoon & Mugen (and all of those other Japanese race companies) don’t make any thin head gaskets for the B18A/B motors.
Only sure way to bump up your compression is to throw in some pistons. I just threw in some US ITR pistons and it hauls ass with a YS1/S1 tranny setup (I wanted to do SiR pistons for even higher compression but it was cheaper this way for certain reasons).