i know it has been done by other N/A vehicles to "band-aid" a lower compression. however, companies like inlinepro.com and cosmetic.com have shown that this can also be a long term compression lowering method.

one installs a thicker than average(by the mm) under each of our heads.
this spaces the head out more, thus decreasing the compression ratio.
for boost, 9:1 or even lower.

i know of many cars that have used this method and were able to get 500whp out of motors that were normally limited to 300whp due to stock internals.

the catch is, your tuner must be top notch and he must meticulously do the tune. the second catch is that it is a band-aid for the real compression lowering job one by getting low comp pistons.

my question is, has anyone done this with the 350z?




my flame suit is on, so speak your mind and i know i'll get at least a couple good posts of peoples input.

 

not sure but my understanding was thicker headgasket higher compression not by that much. the thing is that it doesnt really matter because the rods are the weak link. the amount of torque they are subjected to doesnt change with compression.

 

cometic will made any thickness gasket you want.

go too thick and you'll have issues with the timing covers lining up.

 

the VQ35DE has gay rods

 

you have it backwords. The thicker the gasket the more room inside the cylinder...so the lower the compression.

 

you would have to add somewhere around .070 on top of stock compressed height to gain one compression point.hg should be used to fine tune compression ratio,not create it.with a flat top piston and that much volume you will destroy your squish and the motor would probably be a dud.

 

this is a V6 engine with timing covers that bolt to the block and the heads.


you cant raise or lower the heads much at all or the bolts that go into the block and heads in the permanent fitting timing cover wont line up at all....

 

+1 ... don't bother, if you need lower compression replace the pistons. Also, put better rods in while you're at it.

 

thank you go-fast and audible mayhem for the input. i guess this will lead me into my next post.

if anyone else has any input, please feel free to post.