looking to buy a vacum pump. Are there any other options other than Moroso, Star Machine, GZ Motorsports? Which one do you perfer for the street?

 

For the street? You don't need one. You're not going to see any power gains operating at such low rpm levels.

On my race engine I use a modified LT1 electric smog pump as a crankcase evac system along with a traditional header evac system. When my engine is shut off and cooling down in the pits I can leave the electric pump on to suck the moisture out of the crankcase which keeps my alcohol contaminated oil, cleaner.

If you feel you just need to have one, GZ is one of the most popular belt driven. Star makes a nice 24 volt version which is used in Pro Stock cars.

 

i beg to differ.. LOL.. granted this is probably for a different reason but i need one for my brakes.. i used to have a 294S cam and that barely workd the brakes.. now i have the 306S and braking without the pump isnt an option.. i might as well step on a rock.. but the vaccum pump works like a charm.. i have a stainless steel brake company one for my brakes..

i'm gonna need one for my motor soon too.. positive crankcase pressure blows.. literally.. haha.. i have to wipe off oil from the wiring to my starter every week.. its getting to be a pain..

 

I was told by the motor builder that the vacum pump was the way to go. After I posted the question I started scratching my head on where in the hell I would mount the darn thing? All the locations are taken.

 

The moroso piece works good on the street, so does the Aerospace kit. I try to stay away from Star. They have some poor business practices.

There's nothing wrong with running a vacuum pump on the street. I don't think low RPM power is his main reason for using one. If you're getting blowby and pressure in the crankcase that no PCV system can cure then you need a pump.

How is your PCV system hooked up? With a blower you're going to want a second valve that gets vacuum from the intake side of the blower. If you have a single factory setup that runs from the intake to a valve cover it will work against itself because under boost there is no vacuum in the intake. Making yourself an additional line may save you the need to get a vacuum pump.

 

That's a different type and requirement for a vacuum pump. Moroso, GZ and Star make vacuum pump to flow huge amounts of air to keep the crankcase in a vacuum. Your vacuum brakes only need a simple electric pump and reserve tank if your manifold can't produce enough vacuum for the brake booster.

All the typical belt driven, 3 vane, complete crankcase vacuum pump systems are in the $700 - $1000 range.

 

In a race application what kind of power gains does the vacuum pump provide? Just figured I would ask since everyone is on the subject. I have heard it's only like 5-10 horses.

 

I don't have a PCV system. There is no EGR valve provision on the Holley HSR.

 

You should have one. If you're having crankcase pressure problems that could solve them. Talk to your engine builder. If he set up the ring gaps and designed the engine around the asusmption you would be using a vacuum pump then you need one.

 

Currently no crankcase issues. The motor has only run for dyno testing. I asked because when I use the motor in the car, I don't want there to be a issue. The motor builder said I could use a catch can, but ultimately the vacum pump is the way to go. With that said I still have to figure out where to mount the darn thing.

The driver side is taken up by the S/C compressor and P/S pump. The passanger side is taken up by the alternator with a head mounted position. Only space I can think of is Pass side down low near the crank? That would mean I would need a block plate?

 

I would try a proper PCV setup first and see how it does. I'm guessing the builder has an engine dyno? What kind of evacuation system did they use while breaking in and testing it? You'll probably have to make yourself a bracket to mount the pump if you decide that's the way you want to go. There isn't going to be an off-the-shelf kit to install it. I would use a low mount alternator kit and put the vacuum pump above it near the pass. side head. I've got a small block on the dyno now with a Moroso pump mounted up high like that, I'll try to get a picture of it and post it for you tomorrow.

 

You can get an idea of what kind of PVC system I have on Page 4 of my cardomain page at the bottom. When you find one of the motor on dyno pics double click to enlarge. It would be great to see some pics if you have them.

 

I don't see a PCV system, just a pair of breathers that wont do ****. You'll want to run a hose from the intake to a valve cover to supply the crankcase with vacuum. On an N/A motor that would be sufficient but when under boost it obviously wouldn't work since there will be no vacuum in the manifold. To provide vacuum when under boost you'll want to run a second hose from the intake side of the blower to another PCV valve located in the valve cover.