Vacuum pump or crankcase evac system?

[80superbu]

When should you look to upgrade to a vacuum pump system?

 

[slimbo]

When you have the cash to do it.

 

[gman415]

As soon as you can afford it

 

[LS6 Tommy]

I may be wrong now, but back when I was more involved in drag racing I remember you built the engine specifically to run a vacuum pump with low tension rings. It wasn't an "add-on"...

Tommy

 

[bracketchev1221]

I say when you've maxed everything else out, you can try it. I still run regular valve cover breathers on my 540. I don't have $1000 to put something on and see no gains. If you are looking for hundreths, than go for it.

 

[80superbu]

not me. I'll be good with a crankcase evac system

 

[gman415]

not me. I'll be good with a crankcase evac system

This is what I have now. But I run alcohol and everyone says I need a pump. But right now I need the $1000 more.lol

 

[Damon]

I asked some guys who build really fast Mustangs abuot that a while back. It's pricey, sure. But when you're laying down really big bucks anyway the cost is not a big factor. Like Tommy said, the engine has to have certain things paid attention to before you use a vacuum pump. Rings and wrist pins requiring the most attention, apparently. Then you run it so the pump is basically trying to make the inside of the engine like outer space (as much vacuum as possible).

Doing a setup like that just to draw a few inches of vacuum is apparently not worth the effort/expense.

 

[slimbo]

I use a moroso 4 vane enhanced pump system. The reasons i run one is more for better sealing and to keep any oil out of the chamber. I didnt see anygains out of the system but it keeps everything leak free.

 

[Redline396]

i converted a mid 80's buick smog pump to make a vacume pump......pulled off the pully,sealed the intake opening,used a ford 6.25 pully,taped the outlet with half inch npt tap,drilled and taped tree eighths npt in the back of the case for suction,ran in line with air/oil seperator to valve cover and ran outlet to catch can.........at idle makes 10 hg.....at wot over 25hg.......so had to run vac. releive valve tee'd in on suction line at pump to limit vac. to 12 hg.........no problems so far........and a lot less than a vac. pump.........