The Brookings register. [volume] (Brookings, Brookings County, S.D.) 1903-1971, 1915-09-23

@'S ~ 80 49, w
wheel to revolve ~clockwise, while tn
other turns anti-clockwise, but witt
the brakes applied and holding wei
neither wheel should turn. In TIT
case you mention the brakes eyidentl,
were slipping and thus permitted The
wheels tc turn.
In 6ettiry a motor for high speed
work what changes should be made in
the valve timing?
The most important and effective
change is to keep the intake valve
open for a longer period.
Kindly explain just how a backfire is
caused and why this ohould happen
any more with a weak mixture than
when the mixture is rich. Also where
does the backfire start?
A backnre is possible with eI.her IA
weak or rich mixture, although more
common with the former, because "A
weak mixture burns more slowly. The
backire starts I'm the cylinder and is
due To the presence OF flame In the
combustion chamber when the intake
valve opens TO take In n fresh charge
II the combustion Of the charge is
very slow there will be n flame In the
cylinder, not only all through the pow
or or expansion stroke, but also
through the succeeding exhaust stroke,
so that what gas remains In the cylln-
der when the exhaust valve closes and
tho intolrn VnlNn npnng iG ltill inrpn-
descent and sets the fresh charge on
fire the moment 1t in contact
with it, thus producing n backire
Ordinarily n backfire can only be pro-
duced by a weak mixture at high
speed, say 1000 revolutions per min
ute, although with a very weak mix
ture or a very late spark a backfre
may be produced at a much lower
speed, say 500. 1t Is possible to make
the motor backire by using too rich a
mixture also. but the overrich mixture
burns faster than the one that Is too
lean. and therefore the former Is gen
orally burned out before the intake
valve opens.
Will larger valve increase the power
and speed of a motor?
Large valves are essential TO power.
Large intake valves especially add
much to the power of an engine.
What do cylinders offset from the
crank shaft mean?
An offset cylinder is one whose axis
is offset from the vertical plane
through the crank shaft. That Is n
line drawn vertically through the
crank shaft center. In offset cylinder
construction when the piston Is on top
dead center the connecting rod is not
directly I'm line with the crank shaft.
but, rather, makes an angle with 1t.
Cylinders are Offset so as to dimin-
fish the side pressure exerted between
the piston and cylinder when the pis-
ton is on the firing stroke, accomplish.
ed here by reducing the angle of the
connecting rod when the pressure upon
the piston is great and increasing the
angularity when the pressure is low.
vtto " " ''''
Casehardening refers to a process
of producing a hard coating of metal
over a piece Of steel. The process con-
sists in heating the metal and then
lightly sprinkling potassium cyanide
over 1t while 1t Is hot. This causes an
action between the metal and the cy-
anide, with the production of a coating
which Is very hard. This case or coat
ing has good wearing qualities and
protects the inner metal. which is soft
err and acts as a cushion for the case.
Aside from the cyanide mentioned
above, charcoal is used or charcoal
mixed with barium carbonate.
Can q high tension magnetic that runs
at crank shaft speed and rotates clock
wise be timed or changed to rotate in
the opposite direction, or anti clock
wiser
The magnetic referred to can be
changed to run anti-clockwise by sim
ply removing the gears from the dis
tributer and resetting them so as to
carry the current over the points of
contact throughout the full range Of
spark advance at full retard and at full
advance. Simply take the gears out
Of the distributor, revolving the arma-
ture by hand In an anti-clockwise d.
rection. and when the position In which
the armature turns requires a good
deal Of force to continue the turning.
due to the pull Of the magnetic, insert
the gear In the distributor so that II
Il Just coming into the metal contact.
II the model magnetic referred to has
= roller type distributor the same op-
Grafton holds good, except that the
roller with the internal gear should be
set 90 that the contacts are Just meet
ing the small metal roller.
What advantages are gained BY n.
eno thres piston rtnss 10 The groove
Jastoad ~ onef
The advantages claimed Tor special
hfsfon rings are that they hold compress
hioo better. prevent on from entering
"a compremtpn chamber more effec-
efy1ly ma a. oome cooes reduce the
Nsor = ~ tyllndes walls.