I've seen a lot of speculation about whether or not electric pumps work for crank case evac. Sounds like the LT1 doesn't build enough pressure. I've read about quite a few people who've run the SSBC brake vacuum pump with success.

I'm not looking for a lot of vacuum, just looking for an alternative to PCV. Would probably like to maintain about 5" vac throughout all RPM. Running a pretty tight AFR 383 that will spin to 6500 or so.

I don't want to run a belt-driven pump like the Moroso as I don't want any more accessories on the motor, and I don't need such high levels of vacuum.

Anyone out there using a setup like this? any details?

 

Use this electric vacuum pump

 

A lot of good info there, thanks. Have the GM pump on the way. Will post up some info on how it works out.

 

I used the late model truck pollution pump. Was surprised how much volume this thing pumps. I removed the foam as people suggested. I was dissapointed to find that the thing only builds up 3 or 4". Also dissapointed that on my first startup, I did have some oil leaking from the back of the valve covers - I was hoping that having some vacuum in the crank case would prevent any leaks. Will try again tonight after tightening everything up.

 

I have seen an electric smog pump from a 4.3 S10 added to a 468 cubic inch V8 in a dragster. It was able to pull a healthy vacuum on the engines crankcase and boost ETs around a tenth or two. The oil stayed much cleaner for more passes than before.

 

After less than 2 weeks, and ... I dunno... 30-40 miles of driving, the vac pump died. Of course with no vac pump, I blew out the rear intake seal and spewed oil all over the place. I guess these things aren't rated for 100% duty cycle.

So I'm not sure what to do next

 

There used to be some treads on here about the caddy vac pumps. They were used in alot of the front wheel drive v8 cars to help the vac booster on the breaks.

I have one that I got from the junk yard and cleaned up, I ended up not needing it because my vac problem was due to my cam being installed wrong.

This thing will pull about 15-20" all day long when hooked up to 12volts. if you stepped the voltage down you might beable to get it to pull less vac.

I dont need it anymore so if your interested let me know Ill let it go fairly cheep.

 

I've read about that setup as well. Sounds like they pull good vac, but not very good CFMs. I may be interested in giving it a try though. I'll shoot a PM

 

A windshield washer pump can pull 15-20" all day long too but it doesn't flow enough air. Same with the Caddy pumps. They're good for providing a vacuum source for power brakes if you have a big cam but they can't move enough air to work well as crankcase evac systems.

 

I'm pulling this back from the dead instead of making another post.

I just bought the SSBC kit
http://www.streetsideauto.com/produc...LookupType=NON

I was going to use it for my brakes but was thinking that instead of using it for the brakes, maybe use it inline with a catch can and use it instead of a pcv setup. Anyone have any thoughts on this? I think I am going to call ssbc in the morning and ask their opinion.

 

I think AlkyIROC summed it up in his post above.
For evap purposes, volume ( cfm ) is more important than vac