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Post by Gary P on Feb 5, 2006 16:32:01 GMT -5
Just want to know if the vacuum pump is really worth HP and will you see it on et slips or will it make the motor live longer.
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Post by carrsmalibu79 on Feb 5, 2006 22:01:29 GMT -5
From the best that I can tell it will help et out on just about any motor but motors with alot of blow by (nitrous superchargers ect.) it will help out more as it makes alot more crank case pressure and will seal the rings up much better. The et gain all depends on how much blow by your engine is making. I have found that the best piece for the money is the Aerospace pump and it also looks the best and comes with everything needed for install. Good luck and do some reaserch.
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Post by Guest on Feb 9, 2006 15:42:23 GMT -5
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Post by strokedTA on Feb 17, 2006 15:12:59 GMT -5
I wouldn't buy an Aerospace catalog, let alone anything of theirs to put on my car! Get GZ pump! If not a Moroso, will do. Best though, is from Product Engineering. Good luck, Dave Brown www.wheelsupracing.com |
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Post by hsutton on Mar 15, 2006 13:36:52 GMT -5
My son had a Aerospace vacuum pump and it wore out in less than a year of very infrequent use. He now has a GZ pump after taking both apart he said the GZ pump is designed differently and is a much better design. In the Aerospace pump the blades ride right against the housing and expand outwardly to seal. This leads to very rapid wear and scars the housing, in a couple of months the unit no longer funtions, whereas in the GZ unit there is no direct contact between the blades and the housing and therefore , no wear. The suction pulses from the GZ pump can be felt when turning it by HAND. By the way a typical gains are about 26 H.P. at the rear wheels on his old 540" BB. (672 H.P. with the pump vs. 646 H.P. without it).
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Post by BrianB on Apr 25, 2006 23:35:12 GMT -5
I plan on purchasing one of the GZ pumps soon. It will go on my 548 Chevy with 10.8:1, std tension rings, 350cc heads in my jet boat. It also has a 325 hp shot. It is a lake boat and I was going with the 103 Pro pump.
Any suggestions on options I should get?
Also, I don't have the valve covers yet and I was planning on getting some fabricated aluminum ones with the fittings welded in, then I saw that GZ has an option for a breather with a regulator and oil fill where you just drill a hole in the valve cover - is this a better way to go? That way I can get off the shelf valve covers.
Brian
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Post by BrianB on May 3, 2006 0:23:13 GMT -5
hsutton,
Do you have a photo of your son's engine with the GZ pump on it? I'd like to see how the fittings look on the valve covers and what the relief valve looks like.
Brian
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Post by subhuman415 on May 3, 2006 20:40:11 GMT -5
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Post by hsutton on May 19, 2006 12:25:44 GMT -5
I don't have a photo but the pump is mounted on the left side of the engine slightly lower than the blocks deck with a hose and fitting going into the front of the left valve cover. There is a pressure relief valve at the same spot in the right valve cover with which you set the vacuum upper limits. This motor seals very well and has about 7" of vacuum at an idle. It is limited to a maximum of 12" with the relief turn out nearly all the way out. If the vacuum exceeds 15" according to the manufacturer you will cause oil starvation of the wrist pins and valve guides. So far the small pump, with the smallest pulley, seems adequate for our motor, which has gas ported pistons and .043 hellfire rings. The owner of GZ said this motor has exceptional ring seal for a nitrous motor as he usually needs the bigger pump for these applications.
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