austincrx

Hello everyone,

I need some help on this one. I have done my homework and tried to find this information already, even contacted HKS, but with no luck yet. I am in the process of qualifying the HKS GT S/C kit for use in SCCA club racing, but I need the S/C Crank pulley diameter. The only information supplied by HKS is the S/C pulley diameter, which is 120mm. There is a replacement crank pulley, and a bolt-on pulley for the supercharger. I need the diameter of the bolt-on pulley. Just the OD.


I understand that the boost pressure is what should be the factor here, but I am at the mercy of what SCCA needs to get this project rolling. If anyone knows the gear reduction for the transmission inside the S/C, that may be helpful, but right now I just need the pulley Diameter.


Thanks everyone, you are always a great help!
Austin


p.s. I do not think it will make a difference, but this is for the 10psi 'base' kit, not the high-boost kit.

cheddaboy

I recall it being 6" or 6.25"

austincrx

I got the information from HKS this morning. The S/C Crank pulley diameter is 152.3mm (6 in). The S/C pulley diameter is 120mm. the ratio of the pulleys is 1.269167 revs.

Thank you for everyone's help!