1929Marvel61CarbEssex.pdf

MARVEL

CARBUETER

AND

HEAT CONTROL

As Used on 1929

Essex Super-Six

“BOOKLET 61”

Formerly Booklet "V-1"

MARVEL CARBURETER CO.

FLINT, MICHIGAN

U. S. A.

Model 'V" Carbureter

Used on 1929 Essex Super-Six Cars

The carbureter measures the fuel charges for the engine and

automatically mixes them with the proper amount of air to form a

highly combustible gas. The Marvel model "V" carbureter is of the

automatic air valve, heat controlled type. Its outstanding advantages

are:

1. Simplicity of adjustment and operation.

2. Quick starting in any weather.

3. Automatic and manually controlled heat application to insure

complete vaporization of fuel and maximum quick warming-up in

coldest weather, thereby reducing overuse of the choker and resul-

tant crankcase dilution to the minimum.

4. Economy in fuel consumption.

5. Ease of adjustment of heat control to meet varied driving and

climatic conditions.

CONSTRUCTION

The construction embodies a main body or mixing chamber and

a conventional float chamber bowl with fuel strainer attached at

point of entrance of fuel to bowl. Within the mixing chamber are

two nozzles which proportion the amount of gasoline used in the

mixture. These nozzles are both of the fixed opening non-adjustable

type. One of these nozzles, called the "low speed" is situated in a

fixed air opening, the venturi, and the other, called the "high speed",

is controlled by the automatic air valve, and located under same. An

air screw is provided which regulates the pressure of the air valve

spring enclosed therein. This constitutes the only mixture adjust-

ment on the carbureter. Within this screw is also enclosed a plunger

connected by a link to the air valve.

The function of this plunger is to provide a resistance in addition

to that of the air valve spring to assist in acceleration. This arrange-

ment of plunger and. air valve screw is termed the dash pot.

A further control of the high speed jet is provided by the

"economizer" which is a fuel metering valve operated by the carbu-

reter throttle. This valve provides the maximum fuel feed to the

"high speed" nozzle when the throttle is fully opened for high

speeds, hill power and for quick "pick-up., During the ordinary

driving ranges this valve controls the amount of fuel being used,

thus providing all the economy possible. This valve is entirely

automatic and requires no adjustment.

Built in with this valve also, is an accelerating pump. Quick

opening of the throttle provides with this pump a forced fuel charge

from the high speed nozzle to assist in acceleration and quick get-

away.

Reference to the top of fuel bowl of carbureter will show a little

seasonal control lever for this acceleration charge, marked

"Summer" and "Winter." The "Winter setting should always be used

in cool and cold weather. In this setting all pressure from accelerat-

ing pump, due to quick opening of the throttle, forces fuel from high

speed nozzle. With the control set at "Summer" or hot weather

driving conditions, a check valve in fuel line between fuel bowl and

pump is kept from closing, thus allowing pump pressure to force but

little fuel from high speed nozzle by-passing most of it thru check

valve, back into fuel bowl.

"Summer" setting of accelerating device on carbureter is only

necessary in extremes of hot weather, when quick opening of throt-

tle makes car momentarily sluggish if control is left in "Winter"

setting.

A heat control lever is placed on the carbureter heat elbow to

provide for manual regulation of heat in addition to the automatic

heat control mechanism of the carbureter.

CHOKER AND BY-PASS

A choke button is provided on the instrument board to assist in

starting. Pulling out this button does two things in the carbureter.

First, it closes a butterfly choker valve in the air inlet of carbureter,

which restricts the air opening and consequently produces a very

rich mixture for starting. Second, thru interconnection of the choker

lever and by-pass valve (See cuts p. 4-5), this motion likewise opens

a passage between mixing chamber, just above low speed nozzle,

and the intake manifold passage, just above the throttle. (See sketch

page 5). Due to the higher suction existing above the throttle, the

over-rich starting mixture is therefore immediately drawn thru the

fixed opening in by-pass valve, up past the throttle and on into the

engine. Partial release of choker button on instrument board after

starting, releases choker valve so that it positions itself to the needs

of the engine, due to the action of the counterweights attached to this

choker valve, which now becomes automatic in its, action, the

weights allowing the valve to open or close automatically, depend-

ing on the engine speed and quantity of air passing thru carbureter.

This partial release of choker button does not, however, change

position of by-pass valve opening, which remains open, and engine

therefore runs at an increased idling speed during this period, same

as would be obtained if the throttle were manually opened slightly

and there was no by-pass valve. This gives the car a speed of

approximately 14 to 15 miles per hour on the road automatically,

without the necessity of opening throttle, and is of great assistance

in getting under way after starting a cold engine.

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: