I have been thinking about this and always thought that it didn't make
sense. There shouldn't be any vacuum in the crank case. Period. The
engine draws air over the oil breather to vent the fumes, but this is
prior to any metering and so any "leak" will not affect running. I was
never certain and never got around to asking Darren, however I just
spoke to him and he said it's more likely that if you can affect running
by spraying solvent onto your engine, you are in fact dealing with
intake manifod leaks.
Rocker cover, timing cover leaks are not open to the metered air
intake.... the only bits that are, are intake manifold, and the injector
seals are another possible problem
Martin
content22207 wrote:
Martin G/Darren B know engine pretty well (in variety of marques). If
valve cover vacuum leaks were bogus surely they would have said
something by now.
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