elefantrider
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How many slow kicks does the average norton need, without pcv valve, to cover the screen? Have not checked myself.
Wet sump start
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[/quote]
That was one thing I noticed on my Atlas: Kicking it into compression after stopping the engine meant a few weeks as opposed to a few days for wet-sumping. The difference in levels from and therefore the relevant pressure differential from the oil tank level to the lowest oil exit point is one effect, the fact that the rotary breather is closed is another one. Both obviously make a small difference and thus the process takes much longer.
Tim[/quote]
I am curious as to whether the reed valve breather I am using, (and works very well to prevent oil leaks by providing negative pressure within the engine), might aggravate my wet sumping by sucking oil from the tank until pressure equalizes. I know when I drain the oil from the sump, (my sump is drilled and tapped for a smaller drain screw), I need to help force the oil out by rotating the kick start.
That was one thing I noticed on my Atlas: Kicking it into compression after stopping the engine meant a few weeks as opposed to a few days for wet-sumping. The difference in levels from and therefore the relevant pressure differential from the oil tank level to the lowest oil exit point is one effect, the fact that the rotary breather is closed is another one. Both obviously make a small difference and thus the process takes much longer.
Tim[/quote]
I am curious as to whether the reed valve breather I am using, (and works very well to prevent oil leaks by providing negative pressure within the engine), might aggravate my wet sumping by sucking oil from the tank until pressure equalizes. I know when I drain the oil from the sump, (my sump is drilled and tapped for a smaller drain screw), I need to help force the oil out by rotating the kick start.
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elefantrider said:
Without a crankcase reed breather it would take hundreds of kicks. It wouldn't happen without starting the engine.
A crankcase reed breather is not a PCV valve.
A positive crankcase ventilation system operates off of manifold vacuum and routes the gasses back to the intake to be re-burned. A second vent allows fresh air into the crankcase through a filter. Jim
A
Anonymous
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Ta.
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Hope the light colored oil is just new oil and video light effects. Btw a wet sump Combat will return slugs of oil too via its low down big breather hose slowing kicking over w/o a flapper valve down low. Of course there is a few hp advantage of evacuating case below outside but doubt many would run their Cdo to point that actually shows up. Still as much as some Cdos seem to eat their ring sealing the better the one way valve the more blow by & oil seal tolerance gained before dealing with real issue. Too bad they all blow by so much it fouls the wisdom of Norton low pressure air filter exit of the oil tank vent but don't seem to bother normal PCV plumbed engines.
needing said:
Mayonnaise due to to ring blow by is more white. That looked more like airated oil as you would expect as it is being forced through the breather. At work the large pressurized oil deep hole borers pump oil upto 1000 litres per minute an it comes out the looking the same as that in the film for several minutes until all traces of air are purged from the system.
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I've looked at return oil a lot of times and conditions on my 2 Combats and only ever saw aerated oil on initial start ups with a greyish tint d/t the assembly lube I assume, then cleared up after a couple minutes, which is time it takes for about one full cycling of 2.5 qt oil to flow around at about 3500 rpm. If ya had a bit of air pressure tapped into cases could flush most wet sump out w/o turning engine till ready to go. Merely aerated oil w/o moisture will de gas on its own and pretty fast if at full temp but with moisture added will mayonnaise oil permanently.
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