Custom Rigs Pro Tips
A little fuel dilution, soot, blow-by is OK
as it comes out. Usually it will
be about ½ cup per every
10,000 miles driven.
— Bruce Mallinson
Bruce Mallinson is the
owner of Pittsburgh
Power, an engine
performance shop in
Saxonburg, Pa.
Text INFO to 205-289-3555 or visit www.ovdinfo.com
don't be too concerned about
some blow-by; just install an
oil trap on the end of the
blow-by tube to catch the oil
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I
'd like to take some
time this month to
discuss a few issues
that really aren't as
big a deal as some
people might think.
• So many times we get
phone calls pertaining to
fuel dilution. But if you idle
the engine all night and pull
the sample the next day, you
can bet the dilution will be
slightly higher. According to
Caterpillar, 3 percent fuel
dilution is no problem.
• Another common
concern is high soot levels.
However, most engines
today use exhaust gas
recirculation, so soot levels
naturally will be higher; the
engine is eating its own soot,
and some of it has to get
past the piston rings along
with the blow-by.
• That brings me to
another point: Don't
worry about a little blowby, either. An engine has to
have some blow-by, which is
what keeps the second ring
on the piston seated against
the ring gland. If no blowby gets past the top ring,
the second ring will float up
and down against the ring
gland and wear it out. So
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