Guys,I've got a vacuum pump setup I just finished installing and wanted to start a discussion about how everyone uses theirs. I've gotten alot of help from the YB and Bob with Urbinatis old car. Bob,I know you're on here too,and I take your responses to heart. That's what prompted this post. Bob cautioned that the wristpins may get the oil stripped off and among the group, I'd like to see if there's a consensus on a "safe zone" of operating the vacuum pump. Here's what I've got: Moroso 22643 4 vane pump,7"Crank pulley,5" pump pulley,breather tank and what appears to be an incomplete relief valve. It's pulling crazy hard and I may have to change some stuff. I have a gauge on the way, so in the meantime let's see what everyone runs for vacuum on their stuff...thanks in advance...Fish
We run the same pump on a few cars with no problems. We do not pull over 10" of vacuum usually about 6-8. Reher-Morrison makes a nice adjustable regulator for the vacuum pump. We tried the Moroso regulator but they are junk. Make sure your engine is sealed real well for the pump to be effective. I have a smoke machine that I use to make sure the engine has no vacuum leaks at all. Hope I was some help for you.
Thanks,John..I've never been able to achieve a perfect seal with the gap between the intake and block even with some nice spacers Rick made. The front crank seal (lip seal,not rope) weeps a little bit too after going from 20/50 to 10/30 vr1 and then back to rotella with zddp additive. That's part of the reason it's on there because I'm sick of chasing oil leaks.
I'm the same as John, never above 10" of vacuum. I use a Peterson diaphragm style regulator. I've tried Moroso, McMaster Carr, and one I made myself. My home made version worked the best until I tried the expensive Peterson unit. No comparison... the Peterson unit is great. I've had conversations with quite a few top engine builders and the consensus is that there are very little if any gains in HP above 8" of vacuum. I've seen people run 18" or more...man that's asking for trouble!! On my particular engine (523) we disconnected the vacuum on the dyno and lost a little over 30 HP and gained nearly 20 PSI of oil pressure. The vacuum pumps do work, especially if the engine is designed and built to work with it, (low tension oil rings, etc). Definitely get yourself a gauge and limit the vacuum to 10" at the most. Steve
Hi all, I am also running a vacuum pump. I need to bypass what vacuum I dont need, to a vacuum canister for my brake booster. Any idea how I could do this? Cheers
On my Peterson pump there are two inlets. I would imagine with this style you could have one go to the engine and the second go to the brakes? Not sure. On a typical stand alone vacuum pump with one inlet I really don't know if splitting the line and going to two sources would work or not...it may as long as you have the engine regulated for a max of 8"-10" of vacuum. All this is a "guess" because I have no experience with vacuum pumps other than for their intended purposes. I would call one of the manufactures and ask them what they think. Steve
