Sumpin'

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Think the valve on the rocker cover is an interesting thing, but it wouln't help releave much pressure, it isn't near the size of the breather tube, and if it was open to the outside air,,,woundn't it whistle? Save on having to install a radio in your helmet, no doubt, and I think I have seen this on some engines, but it never could have have much effect of releaving pressure...unless someone wants to point out my miscalcuation...Peace!
 
Hi Blokes ..

Since restoring my Commando back in the early half of the 1990s, my bike has always built up a oil misting on the crankcases below the front isolastic mount. This would be quite severe each time I did a reasonable ride.

Recently I took a PCV from an Australian GM (H) six cylinder engine and fitted it it as close to the oil tank as I could get it.. (After extensive inquiries and research..including the concept that any weak seal, gasket or joint is going to leak oil due to this same pressure.)

My theory being that with the crankshaft and associated hardware executes a massive pump with pistons, the pressure build must be severe.

I fitted this valve working on the research and the thought that if I put the PCV in it will allow discharge of crankcase pressure gases, but NOT allow the rising pistons to suck in additional air which then would be othewise compressed on the down stroke.

It works,....

My cases are now dramatically cleaner and require a "wash" only once in a while!


I would suggest that any open 'breather" or such fitted to an engine is another attempt to alleviate the same pressure.. but I for one would NOT be fitting and leaving an open tube protruding from my bike engine or any other engine. (It is reminescent of some of the older 1950/ 60s vehicle engines which hung a breather pipe down the side ~ what a thought!)

(Piper boy .. the weather down under is our "wet season" as we live in the tropical mountain regions of far northern Australia ~ high humidity and high temps.. high 20s. to low 30s.. too hot and humid at times to ride.. no dramas kicking over an engine here . as opposed to German winter/s! 8) )
 
Stuart SS said:
Hi Blokes ..

.

I fitted this valve working on the research and the thought that if I put the PCV in it will allow discharge of crankcase pressure gases, but NOT allow the rising pistons to suck in additional air which then would be othewise compressed on the down stroke.






(Piper boy .. the weather down under is our "wet season" as we live in the tropical mountain regions of far northern Australia ~ high humidity and high temps.. high 20s. to low 30s.. too hot and humid at times to ride.. no dramas kicking over an engine here . as opposed to German winter/s! 8) )

Thanks for the weather report....snow and such here, and 07:00 the street has to be shoveled, even on Sunday...not plows here in our street...you do it yourself. Very good explanation of the way this PCV works, by the way...even got through MY think head.....Piperboy
 
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