New-York tribune., 1922-01-15
BY Il. Clifford Rrokaw

Iechn'cnl Director 1'csf Side y. VI.
C. A. automobile Schools
Statistics seem TO Indicate that
smoking is a habit or pastimc which
= INDUCED in by a large number Of
men. Outside of u few unusually mar
teular wives who object to haviny
the house cluttcred up with cigar ashes
or bad smelling pipes there is no grcat
protest against this form Of pleasure
Commuters who have to ride on trains
which arc drawn by smoky engines
wish that the railroad would electrjfv
us SUBURBAN divisions, but their com
pialnt Is by no means violent.
Nobody loves an automobile that
smokes. The traffic. cop has a peculiar
antagonlsm against such car, and the
general public would doubtless vote
unanimously II given an opportunity,
to scrap all such machines
Smoke from an automobile comes
from two sources Either too much
gasoline is being burned or too much
lunrlcatlng OIL is being used. The lat
ter Is usually the case. Excessive use
o' gasoline comes from a faulty car
hu1etor adjustment or from noorlv
or from keeping the engine cylinder at
too low temperature because tho
water IN the cooling system is too cold.
iii case the engine cylinder is kept at
too low temperature the carburc.o .or
may vaporize the gasoline properly. but
It condcnses in the cylinder. and there
fore does not burn we'll The partly
consumed parts pass of as black
smoke which comes out of the exhaust
pipe.
Air Limited by Cylinder Size
There must be q certain amount OF
oxygen to consume the gasoline on.
trely. The size Of the cylinder limits
the amount of air which may be taken
N 20 supply this oxygen If the car
burctor is adjusted to feed too mucn
gasoline there may not be enough
oxygen present to consume it all. What
is not fully consumed comes out as
smoke.
10 remedy this adjust the carburet tor
so that no more gasoline will be fed to
the engine than is required to run it.
IN winter weather it is usually es-
sentlal to furnish heat to the incoming
AR at the mixing chamber of the car
buretor. SO that the vaporization will
be complete.
II there is a light blue smoke com
ing 1rom the exhaust pipe this indi-
Gates there is too much lubricating oil.
Such condition may be due to feed
ing too much oil or to running the
engine great deal with the throttle
nearly closed. In order to draw a
charge of gas into the cylinder the pis-
! ton travels partly out of the cylinder
and forms vacuum. With the throt
tie wide open a high vacuum is not OBJ
tanned. because a large amount of gaso-
line and air is allowed to come in and
tlll the cylinder. When the engine is
throttled down by closing the throttle
the air cannot enter in such a large
quantity, and in consequence there
is a decided vacuum in the cylinder on
each intake stroke of the piston. This
vacuum has tendency to draw oil up
past the piston into the combustion
chamber. where it burns and forms
smoke. This is why, when the machine
is left at the curb with the engine
running for any length Of time. it Will
often be found to start away with clouds
of smoke issuing from the exhaust.
Naporization is Retarded
When the engine is running slowly a ir
passes through the carburetor so Slow
ly that the gasoline is not broken up
into very fine particles, consequentlv