Ford T Series User Manual

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Th e Ca r bur e tor . How
does it w o rk?
1
nswer N o. 4 ~
T he carbureto r is of the au t om atic float r. ed type, having bu t one
adjustment-the gasoline needle valve. he cross-section diagram
of carburetor on page 2 2 shows how the gas line enters the carburetor,
is vaporized by a CUITen t of air and passe through the inlet pipe to
· the en gine in th e form of an exp losiv 'm ix ture . T he ga so line ,'
entering the bow l of the carburetor, gr ually raises the float to a
point where the inlet needle is forced 'i wards into its seat, thus .
cutting off the flow of gasoline. As thzasoline in the bowl re~es ,
the fl o at l owe rs, allowing th e need le t dr op from i ts seat an d t1\e
flow of gaso line is resum e d. It is pl ai 't o see that a constan t l eve l
of gasoline is maintained in the carbwletor by the automatic action
of float and needle. T he quantity bf gasolin e entering i nto the
mixtur e is go v erned by the needrlvalve (see Answer No . 45 ).
T
he vo lume of gas mixt ur e enteri.itg he int ake pipe is controlle d• by
opening and closing the throttle , cording to the speed ~esired
~~~~ -
Why is C arbur e tor ad ju st ment A ·. · , 7\ T · !. 43
pl ace d on dash? nsw e r. .l YO.
For the convenience of the drive~ · adjusting th e carb ;,; retor. After
the new car has become thorou ly worked in, the driver shou ld
observ e the ang le of the carb etor adjust~ng rod at 'wh ich the
engine runs most satisfactorily. In cold weather it will '' probably
be found n ecessary to turn the / dash adjustment one-quarter turn
to the . left, particularly in st arting a cold engine. As gasoline
vapo rizes read il y in warm weather, the driver will fine it ~: con o inical
to reduce the q uantity of gasoline in the mixture by ~ the
carburetor adjustment to the rig ht as far as possible without reducing
speed. This is particularly true when taking long drive/ where
cond i tions perm it a fair r ate o£ spe ed being maintained, and accounts
for the exce ll e nt gaso l ine mil ~ ge o btai n ed by good · dr ivers. ~
W hat is m e ant by a "lean" A 7\ T 4
and a " ri ch " M ix tur e ? ·
1
nswer .1 V 0 . 4
· A .l ean mixt ure h as too mu~h air and not en ough gaso line. A r ic h
'
mixture has too much gasoline and not enough air. A rich mixtur e
will
not only q uickly cover the cylinders, pistons and valves wi th
soot, but will tend to overlleat the cylinders, and is likewise wastefu l
of the fue l. I t will often <;hoke the engine and cause misfiring at sl ow
speeds , al thoug h at high speeds the machine will run perfec. tly . T he
mixture should be k.ept as lean as possible without thesacrificeofanyof
the power of the motor. A lean mixture will often result in back-firing
through the carburetor, for the reason that the gas burns slowly in
the cy l inde r, and is still burnin g when the i nlet va l ve ope ns again,
which causes the gas in the intake to ignite. A rich mixture is shown
by heavy, black exha\jst smoke with a disagreeable smell. Pr oper
mixture will cause very li ttle "lm o ke or odor.
123 1

Ford T Series Specifications

General

Brand	Ford
Model	T Series
Category	Trucks
Language	English