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techtalk:ref:engmech05g [2019/05/28 16:11] hippysmack [86-90 Engine Breather Mod Using #4 Cam as an Oil Slinger] |
techtalk:ref:engmech05g [2019/07/17 05:30] hippysmack [REF: Oiling & Lubrication - Sub-05G] |
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- | ====== REF: Oiling & Lubrication - Sub-05G ====== | + | ====== REF: Engine Mechanicals - Sub-05G ====== |
====== 86-90 Engine Breather Mod Using #4 Cam as an Oil Slinger ====== | ====== 86-90 Engine Breather Mod Using #4 Cam as an Oil Slinger ====== | ||
+ | Article by norseXL of the XLFORUM ((http://xlforum.net/forums/showthread.php?t=1930406&highlight=reed+valve)) \\ | ||
+ | |||
This is an idea based from the breathing on the BMW Rotax twins. \\ | This is an idea based from the breathing on the BMW Rotax twins. \\ | ||
They have holes on the outer edge of the gear for the water-pump and the gear sits on the end of the inlet-cam. \\ | They have holes on the outer edge of the gear for the water-pump and the gear sits on the end of the inlet-cam. \\ | ||
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From there the air is fed through a reed or umbrella valve to atmosphere. \\ | From there the air is fed through a reed or umbrella valve to atmosphere. \\ | ||
+ | |||
+ | In drilling the hole in the cam: \\ | ||
+ | The chances of either carbide or HSS drills working well are not high. ((Ireeman of the XLFORUM http://xlforum.net/forums/showthread.php?t=1930406&highlight=reed+valve&page=3)) \\ | ||
+ | They tend to walk over the required distance. A gun drill is good or EDM is best for this process. \\ | ||
+ | You do not want to change to properties of the case hardening (which conventional even with coolant, drilling would do). \\ | ||
+ | |||
+ | A Tungsten carbide was used on the cam below and did work well. \\ | ||
+ | High speed-slow feed and thru the hard layer it went. \\ | ||
+ | Once the hardness is penetrated, it's best to swap to a cheap drill bit to drill through the softer inside of the cam. \\ | ||
+ | Feeding too fast through the soft part with the tungsten can snap the bit. \\ | ||
+ | |||
+ | **The plan**: \\ | ||
+ | In the drawing below, the engine pressure will go in between those two dishes (drawing is for example only... NTS). | ||
+ | The dishes should be as big in diameter as possible on the #4 cam (front ex). \\ | ||
+ | They will have, like pictured, a labyrinth to fling the oil from the air. \\ | ||
+ | Air will then exit the center of the cam into a fixed tube in the cam-cover. \\ | ||
+ | Then the oil seal ring on the end of the cam running on the tube. \\ | ||
+ | The back hole in the cam has to be plugged. \\ | ||
+ | It was just drilled from that end because it's easier to fit in the lathe. \\ | ||
+ | Without the plug, the air will not be forced to enter at a big radius/large centrifugal force. \\ | ||
+ | |||
+ | {{techtalk:ref:engmech:cam_breather_drawing_by_norsexl.jpg?direct&400|}} \\ | ||
+ | |||
+ | **Cam after drilling**: \\ | ||
+ | {{techtalk:ref:engmech:cam_breather_1_by_norsexl.jpg?direct&300|}} {{techtalk:ref:engmech:cam_breather_2_by_norsexl.jpg?direct&300|}} {{techtalk:ref:engmech:cam_breather_3_by_norsexl.jpg?direct&300|}} \\ | ||
+ | |||
+ | The hole in the outside end of the cam is for the breathing, it is the sole exit for the engine pressure. \\ | ||
+ | Air from that hole in the cam will go to an external reed valve. \\ | ||
+ | The original breather exit in the cam-case (4-speed) is to be plugged off. \\ | ||
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