johnwilders
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| posted on 7/10/11 at 08:08 PM |
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Crossflow breather
With a standard 711 cross flow breather what’s to stop it sucking in air thro the vented filler cap down thro the engine & into the inlet
manifold weakening the mixture.
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deltron63
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| posted on 7/10/11 at 08:43 PM |
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Engines normaly blow not suck,so it pushes air out of the cap.
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clairetoo
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| posted on 7/10/11 at 09:22 PM |
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quote:
Originally posted by johnwilders
With a standard 711 cross flow breather what’s to stop it sucking in air thro the vented filler cap down thro the engine & into the inlet
manifold weakening the mixture.
Are you sure , and I mean realy sure , you know how an engine works ? 
Its cuz I is blond , innit
Claire xx
Will weld for food......
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steve m
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| posted on 7/10/11 at 09:41 PM |
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With my xflow, im sure there is to much pressure in there, as its seems to spew oil from every possible place !
If it was sucking air in, my oil level would get higher !
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skodaman
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| posted on 7/10/11 at 10:52 PM |
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As Steve M says. Crossflows are designed to blow oil out, not suck air in.
Skodaman
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Dave Ashurst
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| posted on 8/10/11 at 08:29 AM |
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If the breather was connected to the manifold it could draw air from the crankcase (depending on the strength of the spring in the oil collector
one-way valve).
However I think that the crankcase breather vents into the air filter in a standard factory car installation. I.e. it's connected upstream of
the carb so it doesnt weaken the mixture.
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johnwilders
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| posted on 8/10/11 at 07:28 PM |
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Crossflow Breather
Thanks Dave, you seem to be on the same wavelength, I was thinking maybe it has got the wrong cap. The crankcase breather from the oil trap appears to
have been vented to a T on the inlet manifold, the other side would have gone to the servo. I think the valve in the oil trap is just a flashback
arrestor & doesn’t restrict the flow from the crankcase so the depression/vacuum in the inlet manifold would draw air thro the vented cap rather
than just excess crankcase pressure.
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JoelP
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| posted on 8/10/11 at 08:11 PM |
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back when i had a crossflow, it would dump a pint of oil out in 5 laps  so just as well mine wasnt plumbed to the inlet, as it would probably die
with that much oil going in!
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