NASCAR ENGINE DRY SUMPs and CRANKCASE Vents

Ant · #1 (**permalink**) 05-23-2011, 07:53 PM

Quote:

Originally Posted by scottj

I'd be very surprised to see a 4-stage pump produce 20 in/hg.

Would a 3 stage Peterson pump with two std scavenge sections pull enough vacuum for me to consider a relief valve, any thoughts!

scottj · #2 (**permalink**) 05-24-2011, 05:43 AM

Quote:

Originally Posted by Ant

Would a 3 stage Peterson pump with two std scavenge sections pull enough vacuum for me to consider a relief valve, any thoughts!

I ran a 3-stage SCP pump on the Cobra for a while. We didn't try to pull vacuum... ran it vented. A good quality 4-stage is the minimum we would use to run it sealed.

We'd see 10-12" with a 4-stage Barnes on the Late Model engines. That's why we didn't run regulators, only pop-offs. We'd see a little more than that with 5-stage and gerotor-style pumps.

Scott