Naturally it uses much gas vapor
that passes the rings and which
otherwise would be wasted.
Another manufacturer has gone
back to aluminum pistons. For a time
aluminum seemed useless as a piston
material, but this was due largely to
injudicious design. Several manufac
turers have met with singular suc
cess with aluminum alloys for pistons
and, by degrees, manufacturers are
learning how to use this lighter metal
in this critical position. Lighter pis
tons reduce the burden of the heat
units in compressed and ignited gas
vapor. They make for quicker ac
celeration and less vibration.
Ventilation and Rectification.
Through some of the crankcase
ventilating systems and the rectifica
tion plana, the vapors that are passed
back Into the engine carry enough
oil to keep the valves, upper cylinder
walls and pistons better lubricated.
Valves that never stick and that al
ways close tightly and promptly save
power and gas.
Better distribution of gases into the
cylinders, particularly into the
straight eights, has made for great
Increases In gas mileage. Thermo
stats in the cooling system, automatic
radiator fronts and carburetor heat
controls make it possible to start the
engine promptly without depending
on a rich mixture for the job.
Infrequent oil change is the rule
with the new models rather than the
exception. Keeping gas and water
vapors out of the engine lubricant is
the reason for this. The systems
vary widely and the buyer should keep
In mind that merely drawing off the
frankcase vapors or allowing them
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