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techtalk:ref:engmech07h [2020/10/08 16:33] hippysmack [Oil Drainback and Supplemental Air Intake from Breather Valves] |
techtalk:ref:engmech07h [2020/10/08 16:56] hippysmack [Oil Drainback and Supplemental Air Intake from Breather Valves] |
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| * Air / oil mist enters the pocket and flows past the valve. | * Air / oil mist enters the pocket and flows past the valve. | ||
| * Just past the valve (between it and the vent outlet) is another smaller chamber. That is the final separation chamber for air and oil. | * Just past the valve (between it and the vent outlet) is another smaller chamber. That is the final separation chamber for air and oil. | ||
| - | * Oil droplets fall out of suspension there and down into a small hole between the valve and the cover. The drain leads back into the (cam chest - pre 91) or (rocker box - post 91). | + | * Oil droplets fall out of suspension there and down into a small hole between the valve and the cover. \\ The drain leads back into the (cam chest - pre 91) or (rocker box - post 91). |
| * Air in that small chamber is sent out the 10:00 vent hole in the cam cover (pre 91) or head vents (post 91). | * Air in that small chamber is sent out the 10:00 vent hole in the cam cover (pre 91) or head vents (post 91). | ||
| - | * The bottom of the separation chamber where it says "reed" in the pic below is not really the bottom of the chamber. \\ There is a space (final separation chamber) behind the reed (between the reed and the cover). \\ That is where oil droplets are pulled back into the gearcase that make it past the reed. Vacuum in the bottom end pulls oil from that chamber back into the gearcase. \\ | + | * The bottom of the separation chamber where it says "reed" in the pic below is not really the bottom of the chamber. \\ There is a space (final separation chamber) behind the reed (between the reed and the cover). \\ That is where oil droplets are pulled back into the gearcase that make it past the reed. \\ Vacuum in the bottom end pulls oil from that chamber back into the gearcase. \\ |
| * At the same time, the air is purged out the vent hose. \\ | * At the same time, the air is purged out the vent hose. \\ | ||
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| The drainback hole has a couple functions. \\ | The drainback hole has a couple functions. \\ | ||
| - Engine vacuum pulls the oil that gets past the valve back into the engine thru the drain hole. | - Engine vacuum pulls the oil that gets past the valve back into the engine thru the drain hole. | ||
| - | - The drain pulls in a slight amount of atmosphere to assist in overall vacuum control. | + | - The drain pulls in a slight amount of atmosphere to assist in removing the oil from the separation chamber. \\ You have to have air intake on the back side of suction to fill the void when the oil is removed. \\ If there is no oil left in the chamber to remove, air is pulled in the drain hole from the outside. \\ And that will affect overall vacuum control. |
| The MoCo had these little things ironed out pretty well. They predetermined the drain size so it would act as intended and not derail the pressure.\\ | The MoCo had these little things ironed out pretty well. They predetermined the drain size so it would act as intended and not derail the pressure.\\ | ||
