Old Yesterday, 06:25 PM
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Formulajones Formulajones is offline
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Join Date: Jan 2012
Posts: 7,352

They are a bit of a pain to get all dialed in. With different pulley ratios, adjusting the valve for just the right amount of vacuum at WOT peak rpm, and then finding a place on the valve cover that works for the suction line. Baffle it or no baffle. Lots of fiddling in all these areas.

We tried all kinds of stuff. Front of the valve cover was horrible. Works okay in some race applications but on the street it sucks way too much oil, even at low vacuum levels. I believe it's because you're turning and braking in a street car all the time and sloshing oil to the front. Baffling that didn't help much at all.
Ended up moving the connection to the middle of the cover, at the very top. Even with no baffle there it has shown to be the perfect spot for his application and pulls in a minimum amount of oil, but just enough to lubricate the pump.

They have some benefits. Any potential oil leaks that may occur are virtually a thing of the past. It promotes good ring seal, especially if you're using a small light tension ring package. It's a great way to evacuate the crank case without pumping oil fumes back into the combustion process (like a PCV). They are generally worth a few HP, and this reason alone is why dad wanted to use one. He's turned into a HP junkie and is looking for every last drop, lol.

He bought it second hand from a forum member here too, so didn't pay as much as you would a brandy new one. No telling how much it was used previously but it was all in good working order.

2019 Pontiac Heaven class winner


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