The Sunday telegram. [volume] (Clarksburg, W. Va.) 1914-1927, 1915-05-23

4
speeds. is the result OF weak magnets.
| When this occurs the magnets should
be recharSed
What arc the respective advantages
and Disadvantages of the head and
l.:7ead types OF motors?
The r head motor. because its valves
are located on opposite sides. allows OF
the use OF large valves. and hence more
power is obtainabie than in the L head
variety, other things. OF course. being
equal. It Is usually more costly to con-
struct thar. the Z head type and has
more symmetrical appearance The.
T head. Eoweyer. IS heavier and more
s.complicated than the Z head design.
the latter using only ons cam shaft and.
having the valves all on one. side
What are the advantages and dis,
advantages of the valve in the head
motor?
The chief advantage claimed for the
valve In the head motor Is that for
given size, it has more power than an
l. head OF T head. because OF the fact
that larger valves may be used. and
the combustion chamber given a more
spherical shape. There are number
Of manufacturing advantages. one of
which is that the entire combustion
chamber may be machined and given a
high polish. thus preventing. to great
extent, the accumulation Of carbon.
The loss of heat through the cylin-
der walls of a motor depends to great
extent upon the surface OF the walls.
and in properly designed valTe In the
head motor this wall area Is small.
compared with that Of another type of
motor of the same size. This reduc-,
ton Of wall area is obtained because
of the absence of valve pockets
The main disadvantage OF the valve
IN the head motor. especially one using
valve cages. is that the valve seats can
not be cooled. as Effectively as If the
seat were a 4pagrsof the casting. This
Is true in the cage construction. be-
cause the heat. In order to get from
the valvesseat to she: water Jacket.
must overcome the resistance OF the.
joint between the cage and the cylin-
der casting. This lack of5coolns would
not materially affect the inlet valves,
as they are kept comparadvely. cool by
the incoming gas. but itswould mean
more valve grinding In the case ofsthe
exhaust valves. s-.,-s go & y -
Is It possible to maintain pressure in
asrear fuel tsaie when thef'tsnk esPsis
h1issinsT
in cases of this sort rake IN old in,
ner tube. Gu: out piece about eight or
as TO be air tight. then insert the tied
valve. connection from the pump. In
%t,2 n raF$ bo
tube and pump until the tube. com
pleteiy fills tie hole IA the tank Then
tie the outer end seccrcl.. This con-
trivance viii hold several pounds pres
sure in the tank and will last for some
time
Is +t1ree-eias1ths os-az inch too much
play IN the wrist pin nusnins?
Three-eighths Of an inch is entirely
too much play for the wrist pin bush
1nS. assuming that up and down play
is meant There should be 50 little
play that it cannot be felt by move
ment of the wrist pin
Can siIverize glass reHeetors7 If
20, what are the ingredients and in
what proportions are they used?
An amateur can siiyerze refectorsS
but It is very difficult to make a good
Job Of it. The method by which this
work has been carried out IS as FOL.
lows: First fasten TO a block Of wood
the finest possible grade OF emery
cloth. With this the reflector is
smoothed down to fine finish. It is
! next necessary to have 4 melting pot
and a thermometer which Is capable
Of measuring more than 21o degrees
Two ounces OF lead two ounces Of tin
and four ounces Of chemically pure
t.bismutb are melted together Eight
ounces of mercury are added at IL
degrees Z. and mixed with the melted
mixture. This Is applied while warm
with a smooth camers hair brush
Winch will give the better results
50 or ~ test sssoIine2
AS between so end a test gasoline.
the GO test fuel has been found toss1re3
| the best results as fsr as mileage IS
concerned The gasoline ~hichswe get
| nowadays is much heavier than that
Ion the rnarket. say. i've or ten years
ago.
Can an expert gain any advantage
by changing from automatic to hand
control in a battery ignition SYSTEM
A skilled driver retsht get better re-
suits with a hand contro! Of the
spark than could be Obtained with
! the automatic rpe OF ignition control
for the reason that =rade climbing can
| be ACCOMPLISHED much easier and the
| loads OF the motor considered In 9TH
er words. irhe driver can shift his
| spark TO suit road and motor ccndi7
lions and thus get the hiSaeSt efhcien-
tcy at M. times