The proper crankcase vacuum will prevent oil burning
and increase horsepower & MPG
The process is very simple- the vapors from the motor are pulled
out the PCV valve (high vacuum) and burned in the motor. Clean
air is added through hose A. (low vacuum)- The PCV opens and closes
automatically to achieve the desired air flow rate in the crankcase.
Hose A also acts as a release if there is excess pressure in the
crankcase. The PCV will also act as a check valve if there is
a manifold back fire.
4 cyl engine
vacuum is easily measured (with a homemade manometer)
at the top
of the dipstick tube. (see below)
can go wrong? 1-- wrong size or stuck PCV
2--vacuum leak in hose B
vapor gunk in the intake manifold
are the results?
1--the engine will burn large amounts of oil
2--the engine will pollute the air
3--loss of horsepower
Homemade Water Manometer (cost $10)
conversion factors: 12 inches of water = .43 psi
1" of mercury = .5 psi of vacuum
Note: racing engines require about 4 psi of
crankcase vacuum for max hp-
IS ACCOMPLISHED WITH A VACUUM PUMP-
(note:at full throttle
the racing engine has no manifold vacuum)
note: most PCV valves shut off at about 3psi vacuum
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