The Oskaloosa herald., 1916-08-10

cool IL ny forcing the air IN at the pot-
tom hose connections and allowing il
to come out of the top hose connection
with the radiator removed, provided
sufficient air is forced through
The arrangement which you mention
should be successful provided sutfi-
cient air could be forced through the
cooling system. However, it would be
impossible to force air through rapid
ly enough to keep the exterior of the
cylinder walls cool, as the metal with
in the jackets is not of such shape as
to transmit the heat from the metal
to the air rapidly enough, nor would
the jackets be able to carry sufficient,
volume Of air.
My four cylinder car knocks and
pounds on pull with retarded spark.
IL nisfires when the current indicator
begins to fiuctuate. A new coil and
platinum points have been installed.
Is il possible that the relay is not
rieht7 The battery stands up we'll.
Could il be a spark knock, and, il so,
what is the cause? Would raising the
block one eighth of an inch benefit il
or would il lower it's power?
This is probably spark knock. You
must have the spark retarded too far.
. Try advancing it a little more on such
a pull. There may be u great deal of
carbon In the engine. 1t would be well
to examine the spark plugs to see that
they are not sooted.
Raising the cylinder block would
give you more space in the combustion
chamber, thus reducing the compress
sion and consequently the power out
put. ..
would like to know something
about the properties of gasoline as a
lubricant. Would large size bearing
which is constantly bathed'in gasoline,
revolving at a speed not over sixty or
seventy revolutions per minute, with a
light load, be likely to heat up il no
lubricant other than gasoline were
used7 .,'.. d. ..
High grade gasoline has no Iubricat-
ing qualities. In other words, it has
no viscosity. The function of a lubri-
cant is to separate metal surfaces
and prevent friction, which produces
heat. High grade gasoline is very vol
atile and evaporates readily, leaving
no residue, The lower grades contain
more or less crude oil, and possibly
you have In mind the use of the lower
grades.
What size of wire Is used on the ar
mature of most magnetos, and how
sc 49, = lie
voltage Of magnetic and the amper-
age?
Some authorities advise the use Of
One-half to three-quarters pound of No
% double cotton covered wire. OF
| course the amount and size differ. AS
an indication of the width of vaTia-
ton it may be said that in the line
made by one magnetic manufacturer,
which includes 300 or more, not more
than half dozen have the same wind
ings. This is matter upon which the
| magnetic maker very reluctantly gives
information.
Voltage varies from 5000 to 10000
and there is a great difference in am
perage also, the low tension having a
greater amperage than the high ten
sion.
Which will run the fastest, a four,
six, eight or twelve cylinder car, size
Of wheels, gear ratio, cylinder dispIace-
nent and everything being equaI7
That depends entirely upon the de-
sign and mechanical excellence of the
car Two motors of exactly the same
type and size might have very differ
ent performance for the reason that
one was better designed than the 9TH
err. So there is no basis of comparison.
Are aluminium pistons a success
What changes would | have to make
other than changing pistons7 How
about the connecting rods, ETC.?
| Aluminium piStons have been adopted
! by many of the leading automobile
makers after long test. The aluminium
pistons can be used satisfactorily with
the regular rods in the engine, if that
is what yen mean.
! Kindly explain why valves are re-
| ground by alternating rotary motion,
! in view of the fact that valve tappets
are arranged to give the valves a
slightly continuous rotary motion in
service. Also what are the objections
to the continuous rotary motion in re-
| grinding7
Valves are ground by an alternating
rotary motion to avoid scoring the
seats or the valves themselves. You
know that if you We're sandpapering a
finely finished piece of wood, such as
an automobile body, preparatory to
painting It you would not draw the
sandpaper around in a continuous
path, for that would leave ridges or
scratches The same applies to grind
| ing valves.
Will you please explain the correct
method Of refinishing tenders and hood
on high grade car?
! If the hood and tenders are smooth
and are simply dull from weather no
preliminary sandpapering or smooth
ing will be needed, but you can best
judge that yourself. With the sur
faces as smooth as required, the first
step is to apply coat Of metal primer.
This should be allowed to dry over
- n.