if you were going to use a vacuum pump would it be moroso or aerospace?

richter69 wrote:whats on it now for evacs? if its blowing out seals with proper venting I'd fix the issue besides putting a bandaid on it...........and yes a vac pump is a good thing to have in the right application.

what kind of issue you think i have?

Not to jump your thread here, but I run a Aerospace unit and at 6000 rpm I only pull around 7 inches of vacuum. I've tightened down on the spring pressure relief valve, but still no more vacuum. What do you guys think the problem may be?

Aerospace pump itself.

Years ago I tried everything. Would not pull the vacuum. I tried running the pullley set up 1 to 1 and the vacuum went up maybe 2" total. I did this AGAINST Aerospaces recomendations after probably a dozen phone calls of getting nowhere. They told me if I did that the pump would be junk and probably come apart .............. my reply was I spent a ton of money for a vacuum pump system to PULL vacuum ............... in my opinion I already have a junk pump. What really got me was they would not look at the pump, I was willing to send it back but they were persistant that it was something I was doing. I bought a Moroso, put it on and had to limit the vacuum because it pulled to much. I put the pump on racing junk and e-mailed them the link to the add with the explanation in the add of what I thought of the aerospace pump annd tech support .................. The pump sold within a day to someone in Florida for almost the original purchase price with no questions asked. Did Aerospace buy thier pump back ???? I don't know.

TravisRice wrote:Aerospace pump itself.

Years ago I tried everything. Would not pull the vacuum. I tried running the pullley set up 1 to 1 and the vacuum went up maybe 2" total. I did this AGAINST Aerospaces recomendations after probably a dozen phone calls of getting nowhere. They told me if I did that the pump would be junk and probably come apart .............. my reply was I spent a ton of money for a vacuum pump system to PULL vacuum ............... in my opinion I already have a junk pump. What really got me was they would not look at the pump, I was willing to send it back but they were persistant that it was something I was doing. I bought a Moroso, put it on and had to limit the vacuum because it pulled to much. I put the pump on racing junk and e-mailed them the link to the add with the explanation in the add of what I thought of the aerospace pump annd tech support .................. The pump sold within a day to someone in Florida for almost the original purchase price with no questions asked. Did Aerospace buy thier pump back ???? I don't know.

that good info!!!

the aerospace pump is too small for most big engines. Too much air to evacuate. You have to seal everything up better with a vacuum pump including the valve covers and intake. The bigger moroso pumps are a LOT bigger (pull more air not size) than the aerospace pumps. I will say that with a bbf especially if it was 572 or bigger I would have a dry sump setup on it or put the biggest pump I could find and then a good relief valve.

Also with the aerospace pump you HAVE to have good rotors. They really don't last that long. We replaced ours and had to open up the relief quite a bit.

So does this pump need to be sent back or what? Can they go back through it? I need 10-12 inches

1Bad91 wrote:So does this pump need to be sent back or what? Can they go back through it? I need 10-12 inches

If it's pretty new I would try to get them to send a rebuild kit to try. The carbon fiber rotors wear and result in vacuum loss. The pump as with all vacuum pumps need oil too. Whether it's from the vapor from the valve cover or poor a little in the pump itself. Running them dry will result in premature wear.

It looks new but it's about 5 years old now

1Bad91 wrote:It looks new but it's about 5 years old now

I bet a new set of rotors and you would be good to go. They are very easy to replace, too.

bigjohn2007 wrote:i am spraying nos and it blowing the intake gasket out i have replaced them with gasket maker with a big bead and it still does it and i was told if i had a vacuum pump it would solve my problem.

Have you leaked down the cylinders? I used to blow them out on a 357 and a ton of spray but the rings were toast...

what kind of tools is needed to check to see if the rings are gone and can you run me throw the process so i can understand how to check the rings.thanks

What about the one C and S sells, it's not expensive.