Vacuum Pump Opinion

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92b said:
How is vacuum already created in the crank case?
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Rat Bastid said:
How is there a vacuum in the crankcase without a pump or similar? There isn’t. And it has to do with pressure differential. Nothing gets “sucked” off of anything. To make it simple, the second ring is a scraper. It scrapes the oil off the cylinder wall. The oil ring catches the oil and sends it through the holes or slots in the piston back to the crankcase. What causes that is a pressure differential. The difference in pressure between the high pressure (combustion pressure) and the relative pressure in the crankcase. The higher the pressure differential, the more effective the rings are. The more effective the rings are, the thinner they can be. The thinner they are, the more power you make. There isn’t a vacuum in the crankcase unless you make a vacuum in the crankcase.
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from the pistons moving down, its not a constant vacuum. you need a breather on your valve cover don't you? the vacuum is not at the bottom of the pan like with a pump. and if the rings are getting sucked tight to the cylinder walls which is the purpose of a vacuum pump for sure its drawing the oil to the bottom of the pan off the cylinder walls along with oil from the rest of the system. street motors dont get freshened like race motors do, that is why I believe running a pump on the street would result in a engine worn out prematurely.
 
ch1ll said:
not sure on how much vacuum with or without a pump.
you only pull your motor apart every 3-4 years? no rering between seasons or valve jobs during the season?
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Its not a every weekend deal for me….
Engine always looks good when it comes apart. Usually valve guides and springs.
I got back into racing motorcycles a few years ago which for me, is a lot more fun.
 
Seems like everyone has an opinion and most of the myth's get busted once men with balls go out and disprove them.....for example running around with any more gear than 3.55's. driving with more than a 2800 stall converter and heavens forbid if it's an 8", driving with more than the common 550 hp, driving with skinny front tires, and the list goes on.......reality is that those that argue have never done it.
 
ch1ll said:
from the pistons moving down, its not a constant vacuum. you need a breather on your valve cover don't you? the vacuum is not at the bottom of the pan like with a pump. and if the rings are getting sucked tight to the cylinder walls which is the purpose of a vacuum pump for sure its drawing the oil to the bottom of the pan off the cylinder walls along with oil from the rest of the system. street motors dont get freshened like race motors do, that is why I believe running a pump on the street would result in a engine worn out prematurely.
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You are drawing in ATMOSPHERIC pressure with an open breather. Your not creating a vacuum. Slow down an bit and think it through.
 
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