Hoooking a vacuum pump to a crankcase?
Hoooking a vacuum pump to a crankcase?
(OP)
I have seen the setups where you hook a line to a mount on your header and crankcase to create a vacuum. I have also seen a electric vacuum pump made for a brake booster that says it creates a max of 20hg of vacuum.
Can/will this make a noticable hp increase when hooked to a crankcase or valve cover? Differences between the 2 locations?
Can/will this make a noticable hp increase when hooked to a crankcase or valve cover? Differences between the 2 locations?





RE: Hoooking a vacuum pump to a crankcase?
RE: Hoooking a vacuum pump to a crankcase?
If you pull much of a vacuum, you will then need an oil sump that can handle the pressure differential.
How many pounds/square inch will it take to reduce windage losses? Compute that many psi times all the square inches of the sump...(what was that crushing sound?)
The vac pump will almost certainly cost more power to drive than you would gain from the reduced windage.
Jay
Jay Maechtlen
RE: Hoooking a vacuum pump to a crankcase?
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Hoooking a vacuum pump to a crankcase?
RE: Hoooking a vacuum pump to a crankcase?
RE: Hoooking a vacuum pump to a crankcase?
Anything with a dry sump and a half decent scavenge pump reduces pressure in the crankcase. It all depends on how low you want to go.
To go real low without to big a pump, you need a good seal to stop air leaking in.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Hoooking a vacuum pump to a crankcase?
Tim
RE: Hoooking a vacuum pump to a crankcase?
RE: Hoooking a vacuum pump to a crankcase?
Just enough, you boil of fuel dilution from the oil, and reduce or eliminate oil past the rings and the guides. Some claim you also get a windage advantage.
Detonation from oil contamination of the chamber only occurs if you are already very close to detonation, but of course this is often the case with very serious race engines.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.