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techtalk:ref:engmech07a [2020/10/02 06:50] hippysmack |
techtalk:ref:engmech07a [2020/10/03 04:37] hippysmack [Example of Air Pulses Using a 1000cc Motor] |
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| * Imagine the tractor trailer going into a tunnel. \\ That suspended rain water will collect on the walls of the tunnel and flow down into the storm drain. | * Imagine the tractor trailer going into a tunnel. \\ That suspended rain water will collect on the walls of the tunnel and flow down into the storm drain. | ||
| * Or, in our case, to the return side of oil pump and then back to oil tank. | * Or, in our case, to the return side of oil pump and then back to oil tank. | ||
| + | |||
| + | The piston motions create a pulsating blast of air pressure (push pull condition as each piston rises and falls). \\ | ||
| + | Static oil pump pressure has already been dissipated by the time it reaches the crankcase. \\ | ||
| + | (although it takes static oil pressure to get the oil from the pump to the crankcase) \\ | ||
| + | |||
| + | Likewise, crankcase (CC) pressure will have an average and constant change in velocity. \\ | ||
| + | Oil in the crankcase adds resistance to the air pressure generated (raising the pressure). \\ | ||
| + | The movement of the pistons and flywheels splash oil around in the engine. \\ | ||
| + | Gravity oil (from the drain ports in the heads) returns to the crankcase or gearcase (respective to year model); \\ | ||
| + | * On 1957-2003 engines, gravity oil from the heads fall into the crankcase. | ||
| + | * On 2004-up engines, gravity oil falls into the cam chest. | ||
| + | |||
| + | CC pressure both pushes to and sucks from the breather valve. \\ | ||
| + | |||
| + | The volume between positive and negative pressure decreases as RPM goes up. \\ | ||
| + | {{:techtalk:ref:engmech:positive_and_negative_cc_pressure_by_hippysmack-_smaller_version.jpg?direct&900|}} ((drawing by Hippysmack)) | ||
