Differences
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| techtalk:ref:engmech04p [2020/10/05 04:14] – created hippysmack | techtalk:ref:engmech04p [2023/12/26 21:44] (current) – hippysmack | ||
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| - | ====== REF: Engine Mechanicals - Sub-07D ====== | + | ====== REF: Engine Mechanicals - Sub-04P ====== |
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| ====== Vacuum Pump for Reducing Crankcase Pressure ====== | ====== Vacuum Pump for Reducing Crankcase Pressure ====== | ||
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| That's why racers with vacuum pumps use multistage scavenge pumps to account for the imbalance to scavenge and improve it. \\ | That's why racers with vacuum pumps use multistage scavenge pumps to account for the imbalance to scavenge and improve it. \\ | ||
| - | Regardless, it's evident that some racers use vacuum pumps to increase vacuum pressure in the crankcase of a Sportster engine. ((Hippysmack of the XLFORUM | + | Regardless, it's evident that some racers use vacuum pumps to increase vacuum pressure in the crankcase of a Sportster engine. ((Hippysmack of the XLFORUM |
| It's been said that positive crankcase pressure upon piston upstroke gets between the rings and basically causes bad sealing at the ringlands. \\ | It's been said that positive crankcase pressure upon piston upstroke gets between the rings and basically causes bad sealing at the ringlands. \\ | ||
| This is also in the high RPM range when ring flutter is present. So there are several things happening then. \\ | This is also in the high RPM range when ring flutter is present. So there are several things happening then. \\ | ||
