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The Fuel system includes the Fuel Tank, Fuel lines,
Fuel Pump and Filter, Carburetor, Intake Manifold and Throttle control.
Fuel from the tank passes through the Filter into the Fuel Pump, which
is driven by an eccentric on the front end of the Cam Shaft. The Fuel
Pump forces fuel into the Carburetor where it is atomized and mixed with
air and drawn through the Intake Manifold and Valves into the Combustion
The Engine of the Chrysler Air-Raid Siren is designed
to give highly efficient performance with the use of either Regular or
Premium Fuels available throughout the country. It is recommended that
only high quality Fuel be used, the reputation of the Manufacturer being
your best guarantee of their product.
The Gasoline Tank should be kept full at all times,
this minimizes the amount of air above the Gasoline in the Tank, thereby
reducing evaporation of the Gasoline, which increases Gum content in the
Gasoline, also reduces "Breathing", the cause of Condensation and the
formation of Water in the Gasoline Tank. The capacity of the Gasoline
Tank is twenty-five (25) Gallons.
The Carburetor for the Siren Engine is a double
barrel down draft unit. The Climatic Control provides efficient
operation under all conditions of Starting and Warm-up. Overchoking of a
warm Engine is prevented by means of a heat retainer plate located next
to the Choke Coil. This plate retards the cooling off of the
thermostatic coil, thereby preventing it from closing the Choke while
the Engine is still hot. A vacuum controlled Throttle opener, (Figure 4)
opens the Throttle about twenty-five (25) percent when the Engine is
shut down, as soon as the Engine starts up, this Throttle opener loses
control and the function is taken over by the fast Idle cam. The
Throttle Solenoid opens the Throttle to wide open position to give the
"Warning" and "All Clear" Signal.
The Dual throat Carburetor is mounted on the Intake
Manifold so that the two Carburetor throats (Venturi) may be called
"Right" and "Left" throats. The Right throat feeds fuelair mixture to
number 2 and 8 cylinders in the Right bank, and number 3 and 5 cylinders
in the Left bank. The Left throat feeds number 4 and 6 cylinders on the
Right bank and number 1 and 7 cylinders on the Left. That does two
things: First, it makes all of the fuel passages about the same length.
Second, it gives each passage the same load. As a result, the fuel is
distributed evenly among all the cylinders and the Engine runs that much
more smoothly at all speeds.
The Carburetor has a water-jacketed Throttle body.
The purpose of circulating the cooling system water through passages in
the throttle body is to prevent stalling which sometimes occurs due to
formation of frost or ice on the Throttle valves, caused by extreme
humidity between freezing and fifty-five degrees F. In addition it
allows for a final positive control of the fuel vaporization at all
speeds and loads.
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