Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Canceling out pumping losses of throttle governed engines

Christ · 07-31-2009, 06:12 PM

It's not really a problem, that I've ever seen... this is why we have catch cans, oil separators, and vacuum valves (they're like BOV's, but in reverse).

Catch can keeps fluid oil from venting to atmosphere, oil separator keeps vaporized oil from venting to atmosphere, and vacuum valves will automatically close when vacuum reaches a specified level, e.g. 5", if that's what you want.

Simple A/C clutch would stop the pump (if belt driven, as on NHRA engines) from removing atmosphere until the vacuum valve opens back up. Poppet closes, vacuum pump shuts down, poppet opens, vacuum pump clutches up and turns back on. This would keep you closer to your required vacuum level in the block, easily.

07-31-2009, 06:12 PM	#34 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	It's not really a problem, that I've ever seen... this is why we have catch cans, oil separators, and vacuum valves (they're like BOV's, but in reverse). Catch can keeps fluid oil from venting to atmosphere, oil separator keeps vaporized oil from venting to atmosphere, and vacuum valves will automatically close when vacuum reaches a specified level, e.g. 5", if that's what you want. Simple A/C clutch would stop the pump (if belt driven, as on NHRA engines) from removing atmosphere until the vacuum valve opens back up. Poppet closes, vacuum pump shuts down, poppet opens, vacuum pump clutches up and turns back on. This would keep you closer to your required vacuum level in the block, easily. __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"