Compression Question

andyman · #1 07-18-2008, 12:12 AM

What kinda compression you blower guys running?

andyman · #2 07-23-2008, 05:09 PM

Quote:

Originally Posted by andyman

What kinda compression you blower guys running?

Well let me put it other way, will I be safe with 12.5 with a 1471 on a 572 chevy

Mike Canter · #3 07-24-2008, 06:27 AM

What OD are you going to use on the blower?

andyman · #4 07-24-2008, 05:40 PM

Quote:

Originally Posted by Mike Canter

What OD are you going to use on the blower?

I really have no idea were to start but what is there is 26 on top 39 on bottom 13.9mm any recommendation of were to start at . Let me say I am not trying to rotate the earth or break any records I think this should have plenty of power and then if I do want to step it up some there is room to do so, thanks

Mike Canter · #5 07-24-2008, 06:55 PM

That is 50% OD and that sounds like you are trying to turn the world. That is a lot to start out with. Most times that racers run OD of 30+ percent the compression ratios are in the 11.5 to 11.7 area. The higher 12.5 CRs are normally used when the ODs are down in the 20% area.

andyman · #6 07-24-2008, 07:55 PM

Quote:

Originally Posted by Mike Canter

That is 50% OD and that sounds like you are trying to turn the world. That is a lot to start out with. Most times that racers run OD of 30+ percent the compression ratios are in the 11.5 to 11.7 area. The higher 12.5 CRs are normally used when the ODs are down in the 20% area.

so do i need to change both or 1 what do u recommend I start with, thanks for the help