Evening star., 1920-11-28

equipment. 1t is to be remembered
that the warmer the engine becomes
the less gasoline and more air is re-
quired. so do not allow an exceedingl.
rich mixture to be fec to the cylinder:
as the engine warns. Slowly weaker
Z the mixture until the engine become:
/ thoroughly heated. when the norma
amount of fuel is consumed. This ap'
plies especially to the above men
TONED heated carburetors, which va
porize the fuel quickly.
2. y headlight bulb which throws &
light that exceeds the normal for its
size is of not enough voltage, too low
for the amount of current passing
through it. If used continuously fol
any length of time this lamp Will burr
out. 1t should be changed to one will
higher voltage.
5. The average stock model of ar
automobile uses more than two rings
to piston. while the racing car has
only one or two, because at low speeds
the more rings are necessary to OBJ
tain greater compression for better
compression is not as necessary
therefore. fewer rings to piston are
required. Another reason is that
iuorication is a big consideration in
the engine at high speed With fewer
rings than the stock car contains. the
racing engine is better fabricated be-
tween piston and cylinder More
rings insure higher compression. and
a more oil-tight cylinder, while fewer
rings insure the proper amount Of
lubricant TO the cylinders. more than
the SLOW speed engine requires, and
also with less friction.
a. ~ remedy for clutch which
takes hold with jerk depends upon
ths type Of clutch. If of cone type
which does not turn in oil. usually
the leather has become too dry. 1t is
necessary TO clean the leather sur
race with gasoline wine GrV and
: ply meats foot or possibly castor oil
to soften the leather. Clean off before
operating the clutch. A multiple disc
clutch which grabs requires a clean
ing out of all old oil and an appli-
cation of lighter grade oil. Before
attempting to remedy clutch trou-
BILE in this way try adjusting first.
The springs which hold the clutch
;eng2ged may be too tight or the
clutch otherwise out of adjustment,
causing it to grab.
! .. \ Kissing noise from the engine
always Indicates a leak. 1t may occur
at a connection of the exhaust pipe.
past a loose sparkplug. valve cap.
! IL printing cock or through a loose
connection bctw cen carburetor mani
! fold and engine. Some times a broken
porcelain causes kissing. These de
/ fects all Will cause an audible hiss
noticeable II occupants of the car.
! Upon listening closer. kissing noise
also Will be heard when the engine
, is slowly turned over by hand. if com
preston is leaking past piston rings,
inlet or outlet valves or loose cylinder
head.
/, 5. The first practical four-cycle en-
| gine was perfected by Nicolaus A.
! Otto of Deutz. Germany, in 1877. in
which year he took out a patent COW
| ering this engine and its principle Of
! compression before explosion. The
/! idea was conceived by Alphonse B. de
Rochas in France. in 1852, who OBJ
tanned patent on the engine. The
| ideas on compression carried out by
/, Deutz are still in use in modern en-
gines of the four-cycle type.
! z. Tho cause of noisy gears in the
magnetic drive or in timing gears is
wear, usually, and sometimes poorly
meshing gears. If worn. the only
I. remedy is to replace with new gears.
do not mesh properly and cannot be
adjusted. Sometimes the lack of
lubricant causes noise. and Always
wear. New gearing sometimes gives
forth a hum. caused by the new teeth
not perfectly or too tightly meshing
in by simply driving the car, or by
using some other means of obtaining
good fitting.
5. An apparently tight-ftting set OF
piston rings will not always stop
ver-consumption OF oil in the cy1in-
ders. The cylinder itself may not be
round. or the piston may be worn
Either of these members may be
scored. In some cases the pistons
may be entirely too small for the cyl.
inder. an example of which would be
to use the same pistons in cylinders
which were rebored. Any Of these
intances would cause oil leaking past
the rings to be burned and form car
bon while the engine was in opera
tion. The remedy for scored or out
of-round cylinders is reboring, for
pistons in the same condition replac-
ing with new ones, and for pistons
too small for the cylinders replac-
ing with oversize pistons.
9. About the simplest mixture fol
cleaning leather, such as upholstery
Of the car, is to apply one part OF
sturpentine and two parts Of raw lin.
seed oil mixed.
10. A tire tread which is loose from
the cord or fabric beneath cannot be
repaired satisfactorily IL the looseness
covers more than about third of the
circumference Of the tire. II more
than third. and the tire is in good
condition. retreading will add consid.
cradle mileage to the tire.
This Weeks Questions.
1. In a one-wire electric system. in
(which terminal Of the storage battery
is usually grounded? Can either ter
minal be grounded?
2. How can an incorrect carburetof
mixture be ascertained in addition tc
the common way of noting the color
of the exhaust gasses?N
9. At what temperature should the
water in the cooling system be main.
tanned so that the greatest amount OF
efficiency Is derived from the engine
while running?
4. What will aid in starting a cold
engine, applicable especially in win.
| ter?
5. How does cold weather some
times affect the oil pressure gauge 10.
Gated on the dash?
6. How should brakes be applied OF
slippery pavements?
I. What may cause too weak a car
buretor mixture?
8. Why do some old engines over.
heat more easily than one that il
new?
.. Is a radiator shutter or cover
necessary when a non-freeze solu
ton is mixed with the cooling water
in winter?
10. How can lubricating oil be TESTED
| to ascertain it's quality?
! ff.onvripht 1920 Thompson Featuye Service.