Los Angeles herald., 1910-01-23
D0RRIS MOTOR CAR
COMPANY PRESENTS MODEL

Following the original plan of build
ing only one model to which the entire
energy of the plant is devoted, the
Doris Motor Car company presents it's
1910 model E as a continuation and re-
finement of its previous models.
For the fifth year the 4Ax5-inch
motor and its principal parts remain
unchanged, Mr.. Doris having recog-
nized early the advantages of long
stroke motor.
The only change of Importance in
this years model is in the transmission,
which has been mounted on Timken
roller bearings
The hood, radiator and tenders have
been changed to conform with the style
now prevalent, and the wheel base
heightened two inches.
The price this year includes, besides
a full set of five lamps, a generator or
Prest -o-lite tank, high-grade mohair
or pantasote top and dust cover, all
brass folding wind shield, sixty-mile
Stewart S Clark speedometer, set of
brass tire carriers, all necessary tools
and jack-in other words, ready for the
road.
Building not only their own motors
and all essential parts and bodies, but
also their own upholstering and paint
ing, the company guarantees that the
car will be of the same high-grade
material and workmanship as in former
years.
Their motor has a bore of Az Inch by
5-inch stroke, the proportion having
survived all variations and extremes,
and is now recognized by the best en-
gineers as the leading type. 1t is the
ideal, commonly known as the long
stroke motor.
The valve in the head construction
continues for the fifth year, and is now
irO1 I1nTN fI,,nR ,aI
type. This design, when properly built,
is conceded to give 10 to Is per cent
more power than any other valve ar
rangement.
One of the reasons for this is that
the valves have a free feed and ex-
haust their entire circumference.
A reduced combustion chamber area,
which prevents a useless waste of heat
(power), to the water jacket, and this
saving of heat permits the impulse to
follow the piston at a higher tempera-
ture and pressure, thus yielding greater
power.
Coupled with these advantages is a
one-piece, hardened cam shaft, with
eight cams properly sized and timed
to insure the most advantageous valve
operation.
The synchronism of the Atwater-
Kent ignition system is perfect. 1t
permits the engine to be run at ex-
tremely slow speed, and can be set at
greater advance, giving a greater
high speed. 1t has a spark plug testing
device not furnished by any other
system.
The exhaust manifold and piping
have been enlarged, freeing the engine
of back pressure and increasing the
power.
The Stromberg carbureter operates
on the best known principle yet de-
Vised, and at all speeds furnishes the
engine with a correctly proportioned
explosive mixture.
The carbureter is fed from a seven
teen-gallon copper tank, placed under
the front seat.
The clutch is of the multiple disc type,
having great area of friction surface,
with a low spring pressure giving a
very gradual engagement, is entirely
free of the sharp, jerky action of most
clutches.
The three speed selective sliding gear
transmission is now mounted on Tim
ken roller bearings, which improve the
mower economy, and as they are ad-
Unstable the cost of future repairs of
the transmission bearings is practically
eliminated.
Bosbyshell- Carpenter company, who
are local agents for the Dorris are
reporting a steady demand for this
popular car, and deliveries are now
being made promptly.