Crankcase Vac pumps on steet motor? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-13-2009, 10:55 PM
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Crankcase Vac pumps on steet motor?

How well do vacuum pump systems such as this: http://www.jegs.com/i/Aerospace/026/...K-BBC/10002/-1
work on a mainly street driven car? Idle, continued high rpm, ie freeway.

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Old 06-14-2009, 08:01 AM
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On a street car or even just a basic street/strip car you'll see no difference. Vacuum pumps really only begin to shine on engines with low drag, thin piston rings and even then the increase in HP is relatively small. By pulling a vacuum in the crankcase the amount of flutter the rings are seeing is reduced and the ability of the ring to sit flat against the bottom of the ring groove is increased thus producing a better ring seal. Also the windage of the oil in the crankcase is reduced some which slightly reduces the drag of the rotating assembly spinning in the crankcase. All that vacuum in the bottom of the engine comes at a cost though. Too much vacuum and the amount of oil getting to the wrist pins is reduced to a point where you can seize the wrist pin in the piston and from there only bad things happen.
Vacuum pumps are really only good for those with dedicated race cars looking for those last few HP.
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Old 06-14-2009, 09:19 AM
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These work very good, I run them,
http://www.jegs.com/webapp/wcs/store...crankcase+evac
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Old 06-14-2009, 10:16 PM
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I know it is more efficient when the engine is built to utilize the pump system. I thought as you said that too much vacuum may be harmful to a street engine.
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