Evening star. [volume] (Washington, D.C.) 1854-1972, 1917-08-19
THE EXPERTS SAY.

The driver of an automobile can. to
d great extent control excessive car
bon depositing. The oil feed should
De Just enough to lubricate the pistons
ana cylinder walls; the oil should be
OF good grade and the fuel mixture
should not be too rich. nor should the
air checker of the carburetor be left
closed for too long period
The poorer the grade of fuel and the
( less the ability of the engine to handle
IL correctly the greater the carbon de-
post Whenever there is incomplete
combustion that portion which is not
FUZZY exploded has an opportunity to
hnrn more slowly. leaving behind car
bon IN greater quantity.
The liability of pneumatic tires to
iallure through puncture and blowout
mas always been fully recognized. and
inventors have sought to devise substi-
tute forms which should be free from
TINS defect Despite their efforts. the
pneumatic tire still reigns supreme in
| the pleasure car field.
nevertheless. there are two forms of
| tires still advertised and sold as sub
stitutes for the pneumatic namely. the
cushion tire and the so-called filled tire,
usually consisting of pneumatic
casing in which the place of the in
hated inner tube is taken by mass
| 81 rubber or rubber-like compound.
Ihe special feature of these two forms
is that their shock-absorbing qualities
are entirely derived from the springy
action of rubber
The resiliency of a pneumatic tire
is not due to the action of rubber. but
entirely to that of confined air. En-
tireiy aside from the question as to
whether such substitute forms can be
made 10 afford tolerabie riding quail
ues, TINS fact should be considered:
All pleasure car parts have been de-
signed to operate successfully when
cushioned upon pneumatic tires. and
when supported upon less resilient tires
are subjected TO abnormal and de-
structive stresses
Another fact worthy Of notice is this.
AR is an almost perfect spring. while
rubber is a comparatively imperfect
one BY perfect spring is meant one
| which returns in its recoil all the
ergy required to compress tire is
derived from the engine and in so
far as tire is imperfectiy springy, it
wastes driving power.
From time to time the question of
storage battery location has cropped
up as one of the most persistent prob
lens that the chassis designer is COM
PEELED to face. The public has de
manded free running boards. and for
drop in the number of batteries car
ried on them; simultaneously the un-
der-the-seat method has grown in
prominence.
Battery service stations have found.
however that the heat of the engine
has marked effect on batteries car
ried under the seats in the front com
partment. If any one has had occa-
sion to touch his tools under the seat
IN the course of a run on hot day he
undoubtedly has been surprised to find
the amount OF heat absorbed by them
II this heat reaches the tools in the
compartment, wrapped in their case.
ii will reach the battery well to n much
the water is evaporated at a very rapid
rate, and the instructions to the owner
to refill his battery every two weeks
are entirely Inadequate.
This is a big problem. because It in
wolves millions of dollars worth of
property. Heat must be carried away
from the battery. and the blast of hot
air which comes from the engine is
the worst medium that could be found
to do it. If the battery must be car
ried under the seat let us have the
air bafiied so that cool and not hot air
viii strike the battery container well.
I 1t is generally understood nowadays
| that wheels which are out of align
ment cause undue tire wear. Few own
ers, however. realize that rims which
! are loose or otherwise improperly
] mounted will have the same effect of
causing excessively rapid tread wear
A loose rim generally makes it's pres
cnce known by n clicking or squeaking
sound us is not always so. for oc-
| casionallv a small stone or some sand
may gct in between the rim and felloe.
so as to prevent noise. The rim ap..
pears to be tight. but in reality is run
ming out of alignment and wearing out
| the tire.