Dragaholic

iTrader: (180)

I hope to start putting my motor back in tonight and HOPEFULLY start working on mounting the vacuum system Friday. So before I get myself in a slump/bind/etc., I want to know beforehand how am I going to set the vacuum on my Star vacuum pump system? I bought the optional adjustable regulator that is adjustable by simply moving the nut one way or another.

Dragaholic

iTrader: (180)

Anyone? I plan on taking the car to the track tonight, but need to know how to set the vacuum on it. I assume I need to put some type of gauge on it, but where does it need to go?

MADMAN

iTrader: (4)

You need a vacuum gauge on the valve cover to see what the pump pulls. Then rev the motor up to around 3500 rpms and see what it makes. I normally try to see 4-5 inches at 3500 rpm. Then go to the track and try to see the gauge going down track. I dont like to see more than 10 inches at max rpm.

Dragaholic

iTrader: (180)

See, I was already wrong. I was thinking 12-15 inches.

I'm pulling the vacuum from the valley cover. I cut the vent off, filled it in (aluminum weld), drilled a hole and welded a -12 AN fitting on the valley cover. So that's where I have it hooked up at.

My valve covers (GMPP) have no openings other than the fill cap. So where shall I put it?

MADMAN

iTrader: (4)

You can drill and tap the valve cover and go from there. You can go as high 12-15 I just havent seen any benefits. Ask your engine builder his recommendations on how much vacuum.

Dragaholic

iTrader: (180)

Ok, I'll do that. Another thing on the list I need to add (vacuum gauge). Thanks for your help.

Phil99vette

iTrader: (11)

Which vacuum pump did you go with? If you went with the standard one its got a pressure relief valve you can use to set the vacuum. I also set my old one to 2-3 inches @ 3k and went to 10 @ 7500. If you went with the smaller pump you need to get a relief valve.
Phil

chrismorales75

I can ask, my buddy builds motors, the 406 with 18* heads runs a vacuum pump, it has a little breather with a valve he turns to adjust the vacuum. I'll call ask ask.

Dragaholic

iTrader: (180)

I went with the Standard pump. I know how to adjust it, but I was wondering how I measure it. I obviously need to put a gauge on it. Where did you put the gauge at? Any pics?

chrismorales75

Asked my buddy he is pulling 10" of vacuum in his 406 which revs to 8200.

Phil99vette

iTrader: (11)

I had my old setup alittle different, valve cover went to catch can, catch can went to pump, pump went to air. I was trying to keep the oil out of the unit which makes the rotors stick in the housing or come out slower. I had a 1/8" Barb on my catch can that I put a vacuum guage on.

Dragaholic

iTrader: (180)

I was going to go from valley cover to pump, then from the pump to the catch can. Is this not a good way to do it?

RAGENZ28

iTrader: (5)

My buddies is like phils, catch can before the pump.