[DMCForum] vaccum under the valve covers?

["checksix3" <jetjock11@xxxxxxxx>]

lol...you folks kill me ;)

It's amazing how myths get perpertrated over the years. Just looking 
at the setup will show you there isn't. The oil filler breather piped 
to the air cleaner? Looks like a normal PCV function to me. In fact, 
if there is a car that has vacuum under the valve covers I'd like to 
hear about it.

There is opinion and there is data...like I said, measure it.
If you don't have measuring gear just put a ziplok bag or a rubber 
glove over the oil filler and start the engine. Or pull your oil 
filler with engine running and see if stumbles, after all that's a 
pretty big hole.

If there is supposed a negative pressure delta compared to ambient in 
there than from where would it come? What is the path? That dinky 
vacuum line to the cold start pipe? The one with the orifice? Basic 
conductance theory shows that ain't possible. It could never pump the 
volume down, especially with the outgassing taking place.

Come on Mate...I know you know better ;-)



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