Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted June 09, 2009 09:30 AM
Well, some of the engines with large vacuum pumps are pulling 15" Hg.
Thats enough to suck in the oil pan rail gaskets andother gaskets if there not installed properly. (has happened on the dyno)
It also wears out the rings faster. On many engines we actually break in the engine (rings) on the dyno without the belt on the vacuum pump.
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Y2KZX12R
CompetitionCNC.com
   
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2000redrocket
Pro
Posts: 1662
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posted June 09, 2009 03:31 PM
jim the guy doing my 440 seen a 32hp increase on a 540" big gm engine with the vacume pump. i am sure it was real cause he was shocked it effected hp that much.
on my bike i posted that twice when changing oil with crankcase mod till i pulled off the cap it would not pump oil. and i did have my filter 1/2" off the seat just there scratching my head. then thinking the mod i took off the cap. as soon as the suction relaced you should of seen me chineese firedrill to screw the filter on. it was about 2 to 4 sec then oil all over. motul etech 100. it was like 1.50$ of oil i cleaned up. was funney.
anyway that is what happened to me twice with oil and friends engine.
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