The Oskaloosa herald., 1916-02-03

VIII you please explain the advan-
tages and disadvantages Of the block
and single east syIiHder97
The use Of separately cast cylinders
in multicylinder engine increases the
over all length of the motor and calls
for long crank shaft with more bear.
ing supports than pair or block cast
motor of the same number Of cylin-
ders. This type of motor makes man.
fold connections more complicated
than in the other types, and the weight
is greater for given size because of
lack of compactness Because of the
complications in manifoiding there Is
greater chance of leakage in the water
connections and inlet manifold sys.
tenn. A motor with cylinders separated
usually is not as clean In appearance
as an engine with cylinders east 9TH
etwise ,.t ..
The main advantage of the singly
cast motor Is that should any trouble
occur wlth-nne cylinder that one only
need be removed. This design allows
Of copper water jackets being used,
which are considered by many better
suited for cooling jacket material than
cast iron. Taking four cylinder, sep
arately cast motor, usually Eve bear
ings are used for crank shaft support
This makes a rigid construction for a
shaft and tends to prevent bearing in
jury. A great advantage in manufac-
;rre is that should a defect occur in
the casting it may be junked with
practically little loss. for only the one
cylinder becomes scrap.
The block motor, which has made
such rapid strides In the past few
years, has its. main disadvantage in
manufacture and repair work. Should
a casting ,be>found defective the entire
block must be junked, with conse-
quent loss of money and time. From
an owners point OF view a disadvan-
tage presents itself when repair time
comes around. Should the interior Of
any one cylinder require attention the
entire block must be removed, except,
OF course, where a detachable cylinder
head is used. and then only the head
requires removal The detachable head
on. block motors is coming into. use
very rapidly. A block Is more difficult
to cast than a single cylinder. How
ever, present foundry work has been
improved SO that the: casting of block
cylinders no longer results in great
waste or the production OF many blocks
with imperfections. A further disad-
Vintage Of the block casting is that
should the jacket water freeze and
cause the metal to crack the entire
block may have to be strapped unless,
of course. an effective weld can be
made.
A block cast motor is more rigid than
any other, the manifolding is simple,
and in most cases the manifolds may
be cast with the block. This type is
quleter through life than a separately
cast motor because of the bracing eff
feet of the cylinders. The crank shaft
of a four cylinder block motor need not
have more than three bearings, the
greater number OF small motors using
two. The block motor has shorter
overall length than any other type,
hence shorter shafting and less weight.
What is the difference between a
common valve and a tungsten valve?
A tungsten valve is made of tung-
stem steel, and the common valve
usually has a nickel steel head or a
carbon steel head.
My magnetic will not deliver a spark
when the spark lever is in extreme re-
tard or advance position. When the
switch is turned to the batteries the
spark is the same in any position. The
magnets are little weak. Would this
cause the troubie2
This may be caused by the adjust
ing screw touching some metal part
when the lever is In retard or advance
position. 1t also may be caused by
poor interrupter point adjustment or
by some disarrangement Of the lever
age between the control and the box.
What harm can result from using
graphite in the oearset7 My instruc-
ton book says il this is used the car 10
removed from the guarantee.
Graphite is good lubricant, but the
ordinary form is not as good for gears
as graphite preparations, which have
the consistency of ordinary gear OIL
What effect would weak magnets
have on a motor and how can one tell
that the magnets are wea<7 a7
Usually the first indication OF weak
magnets Is misfring at low speed6.
When the magnets are weak starting
on the magnetic Is quite difficult. owing
to low current generation when, the
motor is cranked. II the magnets are
very weak the motor may stop If the
throttle is closed too much.
Will you please explain how to re-
move the driving members Of floating
rear axle7
The drive shafts of any noating axle
are pulled out without difficulty after
the hub cap is removed.
What damage would be done 70 rear
axle If a rear spring should break
where the torque and thrust are beth
Il. 4 +