Quote:
Originally Posted by Mike Fowke
Thanks. It didn't look to good after blowing oil out of the catch can breather all over the firewall and headers!
According to GZ, it pulls 19"-22" at 3500 rpm. I don't think it's adjustable, but would it make a difference if oil is pooling at or just below the breather?
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Ah....yeah that's a lot. Pulling that much will fill the catch can in no time flat.
You're going to need a regulator to turn that down. They mount on the pump where your hose connection goes to the valve cover. What ever your peak rpm is you want maybe 10-12 inches max at that rpm, and the rest will take care of itself. Once adjusted, usually light throttle cruise will see 3-4 inches of vacuum.
Once set like this it'll go 200-300 miles before you'll have to drain the small catch can that holds about 8-10 ounces in our case.
On a side note, pulling as much vacuum as you're pulling is said to pull oil away from critical areas like wrist pins and can cause failure. However you want it pulling some oil, that's how the pump lubricates itself. If you aren't pulling at least a few ounces after a couple hundred miles, then according to instructions you have to add oil to the pump on a regular basis, which is a pain in the butt by the way, lol.