ive got my v4sti heads and was wondering what thickness gaskets to go for. stock v1 sti bottom end to v4 heads. there is so many diff thicknesssssss
your help is appreciated. phil

 

anyone in the no.

 

Not as simple as that. You need to know what CR you are going to run then you need cerefully calculate what thickness gasket to run. If your CR is too high you could suffer det & engine failure.

 

Provided the Version 3~4 heads havent been skimmed and you are running the standard Version 1~2 dogbone pistons, then standard thickness gaskets will keep the static C.R the same.

Mick

 

wow dident realise it was so impertant. how do you work out cr.

 

You need to know the volume of the top of your piston then calculate the volume of your cylinder allowing for piston volume. Do the calc with different gasket thicknesses until you find the gasket which will give the correct CR. It's hard to explain but not that hard, search the net & U Tube.

 

i think ive got it 10vids later lol. does any1 no the standered cr for a v1 and an v4 sti. thanks again

 

1.6mm

 

i need 1.6mm or thats what they were standered.

what is the standered cr for v1 v4 sti.

 

If you have the std V1 pistons they sit proud of the block at the top of the stroke, the std gaskets are 1.6mm and thats what you need if you still have the std pistons. I think the CR is 8.4:1 on a Phase 1 engine? Hope that helps.
Andy