Electric Vacuum Pumps For Brakes and Crankcase, The 2022 List
 

After many hours of searching for a Crankcase vacuum pump in the 10-14" range unsuccessfully, I figured we could create a thread for those of us using the electric pumps and for those who are interested in going this route to have it all in one spot.

NO mechanical pumps, electric only

Brakes + Crankcase

Details to copy in your post to help us all...

Brand =
Model =
Vacuum Inches =
Used For =


Here's my info

Brand = Leed
Model = Bandit
Vacuum in Inches = 26
Used For = Brakes

Brand = Hella
Model = UP28
Vacuum Inches = 20"
Used For = Brakes


I'm looking for a crankcase pump that's 10-14". I thought my Cadillac pump from the 1990s did this but I can't find any data.

The FAST guys use them since they have to keep stock appearances under the hood. So electric vacuum crank case pumps are easy to hide and provide the same advantages that the mechanical vacuum pumps provide. Might get a more in depth answer on that part of your question from those guys.

Experimented with an electric vacuum pump on dad's for a while to work the brakes. Got it from a 2000's Mustang if I remember correctly. Did the job fine if you don't mind hearing it kick on and off. Eventually hydroboost was the way to go.

So far most are around 3-5" of vacuum with nothing being around a safe 10" or an aggressive 15"

I'm trying to get around 10" so I can not only make a nice little power addition, since I'd be going through all the trouble and money, but also to alleviate backpressure on the rear main seal since I've already got a little leak on a new engine and this is only gonna get worse..

Anyone got anything around 10" that they know works?

If you can't get a 9" dual diaphragm booster to work, then just go manual. Next option IMO is hydro boost.

None of the vacuum pumps I've seen or tried work acceptably. Same with others that I know who have tried to use them.



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Big Hydroboost fan. Known technology. Have been on Mustangs and other automakers
vehicles since 1996.

Tom V.

My 9" 81 TA dual diaphragm booster only got a little iffy when my vacuum was getting below 10".

years ago i saw a clip in Hot rod about new products for an electric Moroso engine vacuum pump that never came to be.

Sorry I think I screwed up this thread title....

I'm mainly looking for a Crankcase vacuum pump or smog pump that's electric and I can turn on with my Holley Hp so it doesn't run constantly and burn up.

10" Vacuum and have multiple ports like a smog pump would be ideal. Most smog pumps are 3-5" and while not bad, not a big enough draw to make huge power change while I'm going through all the trouble and $.

My 4 wheel Aerospace disc brakes, with dual diaphragm 9" booster and Hella Up28 at 20" is the best stopping car I own, it's incredible, need no help here.

Like I mentioned earlier, the only guys I know using an electric vacuum pump for crankcase evac are the FAST racers where everything has to appear stock. But if you ever hear the pumps those guys use, they are pretty loud, and probably has to be a pretty decent size electric motor to even pull 10-12 inches. Plus they generally only flip them on right before the pass, they don't use them idling around because that much vacuum pull would cause other issues at idle and low rpm. Too much and you're pulling oil off the rings.

I tend to think you would need a variable speed electric vacuum pump if it's something you plan to use all the time on the street. Never seen one used in that application. That's where a mechanical belt driven vacuum pump is a better fit.

Here's an example of Joel in his hemi belvedere. At 1:48 he flips a switch before launching the car and you can hear what sounds like a little weed whacker. That's the electric vacuum pump.

F.A.S.T. guys are still doing this today.

https://youtu.be/nKfPiVjUdjU

Why in the world would anyone need 10" of crankcase vacuum? Especially on a street car?

I realize a pcv can draw that much, maybe, but still see no benefit from 10". Even with super light rings, you don't need that much. That's why most only draw a couple inches.

I was under the impression that people who do 'need' to run them are blow-thru cars, but I could be mistaken. Maybe I need some schooling on that...


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From everything I've seen it's pretty typical to have 10-12 inches at WOT being the desired amount at peak rpm. Now when idling or cruising you don't. Maybe a few inches is all that is needed there.

Dad runs a mechanical vacuum pump on his street engine. Now at first he ran a PCV and it was fine, and it was run on the dyno that way. But Tony told him the benefits of having one and eventually dad wanted to try.
The mechanical on there, once the pulley ratios are right, only pulls about 4-6 inches idling and cruising slow speeds. As engine rpm increases, so does the vacuum pull. At peak rpm (6,000 rpm in his case) it's pulling 11 inches. So it's a gradual climb to peak through the rpm range. It's not 10 or 12 inches all the time. That's how they are intended to work.

He's been running it on the car, on the street, for maybe 3 years now. Works very well.

For an electric pump to work like that on the street I would think it would need some sort of controller to work with rpm and increase voltage and vacuum pull as rpm increases. It won't be as simple as just hiding a vacuum pump and wire it up type of deal.

Ok, so it pulls vacuum. What's the benefit is what I'm curious about.


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Removes crank case pressures that robs HP, helps ring seal, keeps the oil a little cleaner, removes the nasty vapors rather than a PCV that pumps it back into the engine combustion chambers.

Have to drain a puke tank once in a while but not a big deal.

I don't think a normal single port vacuum pump will work, the smog pumps are dual port, one to pull and one to exit.
That's my dilemma, the smog pumps are 2-5" which is something but not really a bump in HP like 10-15" is.

There's a guy that swapped in a more powerful brushless motor in his GM smog pump and that seems like the way to go. Get maybe 8" and gain in every category.

Don't expect a big hp gain with a vacuum pump. That is never the number one reason anyone uses one. It is to relieve crankcase pressure.

Yes correct, relieve pressure and maybe get a 2-5% bump from the pump would be a nice gain for the time and $ to do it.
585hp x 3% = 17hp = 602hp

I'm looking into this...
GM or Ford smog pump
12v, 6k rpm brushless motor swap
Holley HP turn on around 3k rpm and 70%+ tps.

Star Machine makes an electric vacuum pump
https://www.starvacuumpumps.com/products/STR.21.08.100

Thanks for the link but...

It's $1,475!!! LOL
It pulls 25" of vacuum though, damn.

I am working with a guy on modifying one from either the LS1 or Cobra smog pump, swap in 12v, 6k rpm, brushless motor, then add 30 amp relay off the battery and pow!!

I'll probably get this configured in my current 12an port valve cover setup with catch can. Pull from the 3rd port in the catch can and have the pump turn on from the Holley around 3k rpm and 70% tps. I'll dyno it with another idea I have of a velocity stack filter base and 1" spacer vs traditional.