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Vacuum pumps #5432250 05/18/20 10:40 AM
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Local Color Offline OP
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Not to remove fluids but to reduce crank case pressure - would this be practical for a passenger car?

Re: Vacuum pumps [Re: Local Color] #5432255 05/18/20 10:43 AM
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supton Online Content
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Practical as in what? To increase mpg or to decrease emissions, for a certain cost?

I'll wager a "nope" regardless. If it could do either, it likely would have been done already. OEM's have a lot pressure to meet certain targets.


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Re: Vacuum pumps [Re: Local Color] #5432265 05/18/20 10:58 AM
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ragtoplvr Offline
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for a passenger car. No. Crankcase windage loss at 2000 RPM is quite small. At 8000 it is significant. Plus race engine are a little loose, and have very thin low tension rings, so can benefit from crankcase vacuum.

Rod

Re: Vacuum pumps [Re: Local Color] #5432270 05/18/20 11:00 AM
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ka9mnx Offline
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No. The crankcase is ventilated to the atmosphere. A little pressure is a good thing but introducing a vacuum into the crankcase is not.

Edit: Not referring to what you said, Rod.

Last edited by ka9mnx; 05/18/20 11:02 AM.

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Re: Vacuum pumps [Re: Local Color] #5432272 05/18/20 11:07 AM
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CT8 Offline
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There used to be vacuum pumps sold for race car use . I don't know it there is still a market for them?


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Re: Vacuum pumps [Re: CT8] #5432275 05/18/20 11:12 AM
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IMSA_Racing_Fan Offline
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Such systems are used by drag racers. Not really needed on street engines.

https://www.dragzine.com/tech-stories/tech-how-external-vacuum-pumps-free-up-horsepower/

Re: Vacuum pumps [Re: Local Color] #5432280 05/18/20 11:21 AM
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supton Online Content
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Where do the drag cars vent the vacuum? Or rather, where does the other side of the pump blow air to?


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Re: Vacuum pumps [Re: Local Color] #5432281 05/18/20 11:21 AM
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Trav Offline
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Your car already has a huge vacuum pump, the engine itself. You don't want or need additional positive or negative pressure (a vacuum) in a street engine as either can cause seal failure.
Some engines like diesels, forced induction and those with big cams require an additional pump for proper operation of the pcv system, brake booster and any vacuum operated controls like those in older cars eg climate control systems, vacuum locks, etc.



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Re: Vacuum pumps [Re: supton] #5432286 05/18/20 11:25 AM
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bdcardinal Online Content
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Originally Posted by supton
Where do the drag cars vent the vacuum? Or rather, where does the other side of the pump blow air to?


The dry sump tank which has a separator.


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Re: Vacuum pumps [Re: Local Color] #5432319 05/18/20 12:15 PM
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SpitFire6 Online Content
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Hi,
No idea what engine you have. On a "classic" engine a slight depression on the internal of a wet sump engine is a good thing as long as no liquid ingested.
It would have to be a large volume pump to exceed what is available from inlet manifold though.
Cheers,
Iain.


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Re: Vacuum pumps [Re: Local Color] #5432328 05/18/20 12:23 PM
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Local Color Offline OP
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Thanks to all the answers

Re: Vacuum pumps [Re: Local Color] #5432344 05/18/20 12:38 PM
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racin4ds Offline
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If your car is new(er) or even decades old, it will have a PCV system which pulls a vacuum on the crankcase from the intake manifold at any time other than WOT anyway.


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Re: Vacuum pumps [Re: Local Color] #5432748 05/18/20 07:19 PM
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Mitch Alsup Offline
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Originally Posted by Local Color
Not to remove fluids but to reduce crank case pressure - would this be practical for a passenger car?


It is done all the time in engines with dry sump systems.
The oil scavenges pumps (plural) pull more oil out of the sump than the oil pressure pump can push into the engine.
There is a partial vacuum in the block, which also means they typically do not need a PCV valve and simply vent the gas off the deaerator in the dry sump into the intakes.

My Ferrari F355 has such a system.

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