Abilene weekly reflector. [volume] (Abilene, Kan.) 1888-1935, 1913-09-18

a careful study of the shape of the combustion chambers
of the three types of motors, is that the Overhead is the
most reliable and most powerful motor, granting, of
course, that the elements of carburetion and ignition are
equal.
The purer the charge the more quickly it burns, as
we have already seen. This explains the fuel economy of
the Buick motor and it's ability to handle a lower grade
of fuel. If a charge of inferior fuel is drawn into a cylin-
der and there mixed with a quantity of already burned
gas, it is thereby reduced in burning value until it's power
developing possibilities are greatly impaired. This is
especially true if the combustion is rendered slower be-
cause of the irregular pocket construction in the cylin-
der walls, as is the case in the 'tT' Head or "L' type
motor. But if the charge, though of inferior grade, be
quickly fired and the dead gas be completely exhausted
from the cylinder OF a valve-in-the-head motor, the pow
er production is much greater. The Buick Overhead gets
all the good there is out of the fuel.
It also permits Of lower compression than is possible
with other types. In the "T' Head, with it's two pockets
branching off from the top of the cylinder, the gas must
fill both the cylinder head and the valve chambers; and
to compress this charge the piston must travel much
closer to the top of the cylinder. On an ordinary motor
1t must go to within about 78 of an inch. In the "L''
type, where there is but one side pocket, which is, how
ever, much larger, as it must house both valves, the PTS
ton does not need to go quite SO high, but stops about l
to | 1-8 inches from the top; but in the Overhead types,
where there are no extra chambers or pockets to fill, the:
piston does not travel SO far and stops compression / 3-8
to l IL inches from the top.
Thus the conservation of heat units, the complete
ness and qulckness of combustion, the freedom from
carbon deposits, and the saving of power combine TO
create in the Buick motor a surplus of power at least 90
per cent over the '|T'' Head and Is per cent over the IL"
Head type Of construction.
The Buick is a clean motor, and a clean motor is
long-lived and extra efficient.
Cylinders are kept fabricated by oil which is splash
ed against the plstons and distributed by them along the
walls. Some of this oil works its way past the piston
rings and up into the combustion chamber at the top.
inns surplus is thrown out through the exhaust valve
along with the burned gases. If it passes out as vapor,
no harm is done and no opportunity to carbonize is Civ /
en-. but II the oil without vaporizing reaches hot sur
races, Ike the valve heads, the volatile parts are quickly I
thrown off, leaving deposit or carbon. But Buick valves. {
being located in the top or head of the cylinders, are far 8
thest from the piston and equidistant from the side walls. :
Ii is hard for oil to reach them. Herein they differ from !
the other types, which are set low in the combustion \
chambers, practically on a level with the top of the pis- \
ton when at upper center, and wherein any surplus oil is 1
thus easily thrown into the pockets and over onto the !
valves.
These are the reasons why the Buick motor, the back
bone OF the Buick success, gives the owner not alone "un-
of service for the minimum of COST