Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1920-10-03
S|MPL|F|ED LESSONS IN
CARE OF AUTOMOBILE
GucrrIich Explains the Vacuum
Systcm-EXpcrt Answers
Many Questions.
LECTURE "I..
The Vacuum System,


In tho last lecture i mentioned the
fact that, because OF the difficulty
OF keeping the tank and piping OF
he pressure feed system from leak
ing. the vacuum system was displac-
ing the pressure system.
Let us Imagine We are inventin2
sneh o system snP pIS we senn naa
then in some way drew all the air
out OF the tank. or. In other words.
rreated vacuum in IT. What would
of tho pressure OF the atmosphere.
would be forced. or. AZ is generally
said. sucked up through the pipe -"
If the bottom OF the tank had Il
,or, placed much lower. would the
sucked up from the supply tank be-
cause Of the vacuum. tho gasoline
earburetor instead OF Moving TO i.
Thus here is = problem. This.
however, at first glance. can be taken
care OF by having tho tank divided
lower. and having the lower op...
TO the atmosphere, as shown dotted
IN FIG. l. This Will permit the gaso-
line 70 flow from the lower chamber
70 the carburetor. but viii it now
rom Che upper to the lower? No.
not while there Is u vacuum In the
20 mere ~ another problem.
nc liquid cannot flow from the uppey
10 me lower chamber in a constant
S,rshm. but could we mako it flow
periodically? Let VIZ see. IL we make
Il vacuum in the upper chamber and
men draw gasoline from the supply
INK INK until The chamber is full. and
men open the chamber to the atmoS-
plcIr VIII the gas How to the lower
chamber? Why, yes.
How, then. can we cause a vacuum
10 l"tin In the upper crnamber when
,n. ~ ei mby, ana tnI, 9pen i to the atmos.
~ valves, but how can the valves
bc operated? Why. BY a nont. Thus
"" 60, nave " ne construction In rig. 2.
: hraTn out OF tho chamber md "a"
NE yalve which VIII open and close
-" -, IL a pipe open TO the air, and
~, s Ea're. &C. is the float. Note
higher than the center IT,
~ the level II" Thus This level will
:" pu'!Td up and open ~ ana close
Sbnni.hg VIII be lower than IT," ana
ANY, AZ IN: lever - Win be pulled
m aH" r, closing "B" and opening "a"
hF ms arrangement "B" viii open
ana "a" closed for ;lmos, the entire
uIWnwarui movement Of the Non,,
wniie b. Will be closed and "a"
~. ior almost the entire upward
-, How is the Vacuum obtained :?
When the engine Is running there is
% isso Jun IN nc ne. inlet manifold. and
manifold this vacuum viii also form
IN INC vacuum or upper chamber.
IN order to prevent the l!quid being
flokedc from tho lower to the upper
chamber a, check, or. as it is called.
napper valve II" ie placed on the
,,abe through which The gasoline
Not" that tho mouth OF the pipe
r"d!nE 10 the Carburetor is higher
'NHn ms bottom Of the tank This
allow the water 10 settle in
2" loom and not flow to the car
U'gi0r !. Is a good plan. therefore,
fh!n Out about cup full OF the
IN.i once week through the pet
~ review tho act!on--whcn the en-
2Ic IS running "a vacuum VIII form
.HI h9 =; CHAMBER and gasoline
nhn"r chamber from the supply tank
the moai IS ra!ssd. when the
- ."'- w.ll be cut on and the at
me-! Us... ies IN The gasoline Will
'.' % ihiS 10 the carburctor. AS the
Ter chhmbc- cnptics. It's float will
.,nN ppcn N" suction pipe and
'a Gnr ab,mssonet Hdj Rps a1sIn.
Ec'auS" OF the great variations IN
We Methods used 10 adjust the mix
sSSIin,iiti,tt!h me n"T ,S Garhuretors. most
a. N ,Stromberg. adjust on the air
II ~ difficult 10 give a method OF
ahluSitne without taking up each
CarbGrntor separately. The follow
ing, however, viii be n help. The
operator viii first have TO determine
what the various adjusting screws on
MS particular carburetor are for.
Jiic stri's 10 take when adjusting are
as follows:
J. Be sure that the ignition is o. X.
2. Re sure that no false air. ia
entering, either where the carburctor
is Joined To the manifold, or where
the manifold is joined to the cylin-
dcrs.
3. BE sure tho gasoline is feedinp
properly to the cRrburetor
&. Warm up the engine by running
at least fifteen minutes.
D Make the low speed adjustment
thus: Retard the spark: slowly turn
the low-Spccd adtutmcnt screw sc
as to make the mixture lcaner. Ir
doing This, turn the screw one notch
nj time, and then wait. 10 see what
the result it. Keep making the mix
ture ieancr until there is a popping
~ the carburetor. or the enigma
stops or m.siires. then enrich the
mixture one or two notchcs Start
the engine and note how II runs, II
il runs smoothly. enrich ono notcr
and see II the engine speeds up. ii
not. go hack to the former setting
IL IL speeds up. enrich another notch.