Evening star. [volume] (Washington, D.C.) 1854-1972, 1920-09-05
Answer. to Last Weeks Questions.

Answers to Last Weeks Questions.
/. A good black mixture to apply
to a radiator rs composed Of an ounce
of turpentine, three ounces of boiled
linseed oil and four ounces of lamp
black. Thin down with turpentine If
necessary. To apply satisfactorily use
a spraying device or dip the radiator
in the mixture
2. An old engine with worn bear
ings and pistons will operate more
quietly with fuel of low gravity, due
to the more gradual pressure and
slower fame rate of this grade of
fuel. High gravity gasoline is of
more powerful but faster pressure.
therefore more apt to produce knock
ing or noisy operation of worn parts
in the motor.
8. When testing spark at the spark
plug end Of high tension wires do not
separate the wires from their proper
connection at the plug more than
quarter to three-eighths of an inch.
Any further distance may strain or
break down the ignition coil
4. To test a carburetor to find out
if it requires adjustment. run the car
a distance on the road with throttle
wide open. and il the engine. instead
of quickly picking up speed. chokes.
misses. backfires or stalls. the car
buretor is in need of adjustment.
Tuning up the engine while the car
is in motion on the road is the surest
way to discover wrong carburetor
mixtures.
S. A coil with an internal connec-
ton short-circuited NAV cause an en-
CINE to operate smoothly on high
speeds but miss fire on low speed.
6. Backfiring and blackjack are
terms of entirely different meanings
Backfiring in a motor is caused by
too lean carburetor mixture, which
| burns so slowly that the combustion
of charge is not fully completed when
| charge to the cylinders: the new
charge on entering the cylinder is ig-
| nited in the intake pipe or manifold
and forced back to the carburetor. A
| Blackjack applies to the action of the
engine when it revolves in opposite
! direction, due to the spark being adj
| vanced too far while the engine is
cranked.
i Z. Water in the cooling system will
become heated and boil more quickly
in high altitude because of the lower
atmospheric pressure to be overcome
in boiling. At about mile above sea
level water boils at 10 degrees less
heat than at sea level.
Il 8. Two different horsepower ratings
Il given to an engine mean the rating
! it assumes when tried with the
formula of 1000 revolutions per min
ute. standard of the Society of Auto
motive Engineers, and the other rat
ing given at actual block test to
ascertain overloads the engine will
| stand for given periods.
i 8. Beside the actual operation of
/ a car, the driver should acquire a
knowledge of the time required for
various parts to function properly
and without strain to the mechanism.
For instance. he should learn the
shortest distance in which the car
can be stopped with the emergency
and foot brakes on both wet and dry
pavements. or. in case the brakes
fail. how hest to stop the car by
manipulation of clutch, ignition
| switch and transmission. In turning.
learn the broadcast turn the car will
make, the shortest turn. and how
| the car turns and handles without
skidding in mud or wet streets. This
may not only avert accidents, but
will also lengthen the life of tires.
Know the speed Of the car. how long
il will. throttle down. and. on the
lowest speed in high gear how you