Evening star., 1921-06-12
to Last weeks Questions.

Answers to Last Weeks Questions.
l. The transmission gear set is
used on the automobile for increas-
ing power in the engine when start
ing away, driving up steep hills or
through sand or poor roads. AS there
Is only q limited amount of power
developed in an engine because Of
the limited amount Of explosive mix
ture admitted to the cylinders. in
creased power is obtained for the
above mentioned conditions only
through engaging lower speed gears
Of the transmission, thereby revoiy-
proportion to the speed of the car.
2. Before attempting to adjust a
carburetor the engine should be run
until it has attained the heat 1t
would normally develop on the road.
Adjustments to a carburetor maae e
while the engine is cold would be
faulty when the engine became heat
ed, and a readjustment would be neces-
| sary.
8. Not much care is required Of the
minor working parts of a car. such
as brake rods and clevises, but since
dust, water and mud from the road,
they should be cleaned frequently
| and oiled whenever the chassis Is
, fabricated. If not attended to these
parts will wear quickly and cause
| numerous squeaks and rattles and
other troubles hard to locate.
4. There is no reason for not using
oil as lubricant in hand tire
pump except that the oil is apt to
| work into the interior Of tine inner
tube through the valve. This is to
be avoided. as oil deteriorates rubber.
For this reason oil should not be
| used in the valve plunger to prevent
sticking. AS a substitute for oil in
the pump use dry powdered graphfte
| in small quantities. and II the valve
plunger sticks, remove the valve in
| sides and replace with new.
5. The engine is used as a brake 10
slow the car speed on down grade by
| switching off the ignition just before
| the car starts down the hill and before
it has a chance to gain momentum. The
| momentum Of the car revolves the en-
gine against compression. Because there
are no explosions to revolVe 1t, each
| compression stroke Of piston checks
| the car speed. The clutch must be en-
| gagged, also the transmission gears. On
| engaged, but on average-sized hills high
gear is sufficient to retard the speed
! Of the car.
6. The average size of the Americas
] autOmODlIe Is a Ne-pdSseHseT Sdi Will
105-inch wheelbase. The average price
| Is 1895.
Z. Most spring troubles. such as break
age or lack of resiliency, are caused by
lack of fabrication. A rusty spring VIII
cause damage to car and tires on ac-
count Of its sluggish action on rough
| roads. Moreover. II it receives hard
impact suddenly it Is apt to break.
8. All four wheels Of modern cars are
the same size, but in some early makes
the front wheels were smaller than the
rear wheels. This was Objectionable for
a number Of reasons. one OF which was
the necessity of carrying two different
sized spare tires.
g. A leak in a gasoline line connection
should not be stopped by the use OF
white lead or other material containing
oil, as the gasoline flowing through the
cause leaking. Shellac or soap are bet
ter agents to use as leak preventives.
10. The warm air inlet pipe leading to
the carburetor has a shutter arrange
ment for admitting cold air to mix with
the warm air before it is dra awn into the
carburetor. This cold air shutter is
necessary and as rule should be open
in hot weather, as otherwise the mixture
would be too hot and consequently too
fully expanded to fill the combustion
chambers of the cylinders. resulting in
a loss Of engine power.
This Weeks Questions.
1. Can transmission gears be shift
ed without first disengaging the
clutch?
2. Do all carburetors have the same
principles of adjustment?
3. Why is the carburetor mixture