Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1918-03-31

for measuring the amount OF work
a machine, Of any kind. can do. Inc
foot pound is the small unit there
being $4,000 foot pounds IN one
horsepower one foot pound II the
amount OF work done IN lifung one
pound one foot In one minute.
In an automobile tho pounds
come from the pressure OF the wind
displaced and the friction. while the
feet comes from the speed of the
car Here you will find the pres
sure. or pounds OF the form ula
20 be comparatively small, while
the number OF feet IL great In a
tractor. the prcsHures or pounds
will he great. hut the speed. or
feet small Thus. while an auto
/ cannot pull the load OF tractor.
[ II It's small the load must be multi
! piled by IT, great speed, IL will give
the same value. nA will multiplying
/ The great load OF tho tractor by lts
/ IlOw speed For this reason the
same size engine. II suitable gearing
/ he used, can do the work ~ both.
/ The horsepower Of the engine Will
/ he the average pressure of the gases,
| times the piston area, times tho
struke. times the explosions per
minute. divided bv % 900 The
/ first two give the pressure, the sec.
/ ond two the feet The speed OF
/ tractor engine h greater than for
an automobile engine. for the Aame
vehicle speed
q. Does It take more gasoline or
/ less gasoline per mile 10 drive an
/ automobile thirty miles per hour
/ than IL miles per hour, under the
/ same road conditions? Have there
/ been any tests made In this ro-
spect7 l.. Nick
/ A, The amount 81 gasoline used
/ por mile Will ho about the same
| for the two speeds. depending upon
/ the difference In the efficiency Of
the engine at the two speeds The
| engine viii undoubtedly be more
efficient at the higher speed. but
| the pressures which must be over
come. due to the wind resistance,
increase as tho square ~ the speed
| At the speeds YOU mention the nd-
vantagcs Of the engine efficiency at
the higher speed viii be negntived
4 ny the Increased resistance rests
! nav" shown that with most cars. A
| speed OF from 20 10 % miles Will
Yield the greatest mileage per gal
! Ion of gasoline.
y | recently ground In MY valves
! out cannot got the valve cups tight
! lheN are cast iron ana break N
! try To get them up hard can yon
suggest way 10 get them tlEhtg It.
lS (------D car.
! a You can now get steel valve
caps from thu makers II your eat,
Smeating pastGGof graphite and
shellac on the THREADS Of the caps
VIII help much 10 make them tight.
You should also uEn new gaskcts
a. fleaSe tell me how To find
out what the gear ratio OF a .car ls
ana how to change H. have a tour
ing car ana put a heavy closed body
on II. and the car has no mower
hnNe to shIft for small hills They
say that by using bigger gear ra-
no ! VIII get more power Is this
right W "a
A. The gear ratio refers TO the
number OF teeth In the large dr..
terential gear as compared with tbe
number OF teeth In. the dIsferentIaI
driving pinlon. Thus, II tho nininn
has ten teeth and the largo genr
thirty, the ratio will be 10 Al nv
counting the teeth you can deter.
mine the ratio. To chanph tho ra.
no YOU viii have TO install a new
gear and pinion, UsnK gears o,
sreatef ratio will permit OF easlcr
hil-climbing and give the engine n
steater leverage. Heavy imousines
ana trucks always have gears ~
greater ratio than the lighter tour
Ing cars 'o"'
MY Ford car has no power
OF compression. I can spin II with
ease, IL works O. X. on the level
but has no power on hills. What is