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REF: Engine Mechanicals - Sub-07G
Further Study of the Timed Breather Valve
A street oil pump has 2 slots and is driven at 1/2 engine speed. 1)
A racing oil pump has 4 slots and is driven at 1/4 engine speed.
All 4 stroke engines takes two revolutions before you come back to the timing marks being all aligned.
| Left is the unmodified 1/4 speed R valve. Right is the 1000 stock. | R model is the left one. |
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1)
thefrenchowl of the XLFORUM http://xlforum.net/forums/showthread.php?t=448751
