4g64 crank with 9:1 je pistons

[1991tsi]

ok i have a 91 tsi with 9:1 je 20 over pistons and crower rods if i put the 4g64 crank in it what difference would it make from the 8:5 pistons the kit come s with? Would it not work or would it actually be better does any body know or do i just have to do it and find out myself by doing it ?

 

[trbotaln]

tuning with the 8.5 pistons will be a lot easier. more compression than that is a lot for a street drivin car.

 

[1991tsi]

it is a street drivin car but olny occasionly it is mostly raced would it run ok or do you know what kind of problems it would have?

 

[VRC Racing]

ok i have a 91 tsi with 9:1 je 20 over pistons and crower rods if i put the 4g64 crank in it what difference would it make from the 8:5 pistons the kit come s with? Would it not work or would it actually be better does any body know or do i just have to do it and find out myself by doing it ?

You will not be able to use your current pistons with a 4g64 crankshaft. The stroker kit pistons have the wrist pin moved higher up the skirt and also have a deeper dish to correct the CR ratio.

-Russ

 

[tyler094]

Let me start by saying this. 8.5 compression is plenty but I just think you should know that if you are planning on using your pistons for your 4g63 motor they aint gonna work. When you put the 4g64 crank in your car you need stroker pistons. The only thing that will work is the rods.

 

[Injected]

Let me start by saying this. 8.5 compression is plenty but I just think you should know that if you are planning on using your pistons for your 4g63 motor they aint gonna work. When you put the 4g64 crank in your car you need stroker pistons. The only thing that will work is the rods.

This is correct. The stroker pistons are 6mm shorter I think. The problem will be contact with piston/valves if you use the regular height slugs. Good post tyler094. Have some rep points.

 

[huafist]

tyler094 is correct. You have to have stroker pistons with the wrist pin moved up 6mm to compensate for the missing deck height. You cannot use standard 4G63 pistons in a stroker motor.