electric vacuum pump

[23TrackroadsterV6]

Might want to take a look at the following link. http://nutterracingengines.com/racin...uum_facts.html

[TGP37]

OK, I do have to admit that this would be an extreme case, but if you pulled 15 inches of vacuum in the crankcase you could never deliver oil to the engine. Also, there is a problem with oil boiling at extremely low pressure, probably something not many will encounter, but somethign that can happen in extreme conditions, mostly when trying to operate recip engines at really high altitudes. Interesting stuff however. Larry

If the pressure is the same at the inlet as the outlet, then the oil pump will not know any different. In this case, the oil return is subjected to the same pressures as the feed, generally there is resistance to consider but that should reduce proportionally to the pressure reduction.

I've read several cases where a high vacuum produced more power. Needed a 3 stage pump to achieve but was done.

Noting the boiling oil, I bet the water in the oil flash boils easier with a strong vac in the crankcase.



Can't say I know for sure, but in this case vac in the CC is a good thing.

[dskopek]

Most of the time when you are pulling vac in the crankcase you are using a dry sump setup so the pressure stage is pulling from the tank instead of the pan so it will not care.