New Features for 1964

Fuel System

from Chrysler Corporation; October 1962


Imperial Home Page -> Literature -> Articles -> New Features for 1964 -> Fuel System


BBS SINGLE BARREL CARBURETOR CHANGES

- FOR BEVER HOT STARTING -

  • Main discharge nozzles have upward angle. Venturi position raised accordingly. (Improves hot starting Ś less fuel dribbling).
  • New float valve and seat Ś has thin rubber coated metal gasket for better sealing, and shorter redesigned orifice for less fuel aeration.
  • New float design for greater float drop.

FLOAT, VALVE AND SEAT-BBS CARBURETOR

  • Seat fitting identified by grooves.
  • Shape of float permits greater float drop.
  • Less "burbling" reduces fuel aeration.
  • Can be used on prior BBS Carburetors (new type gasket must be used with new seat).

BBS SINGLE BARREL CARBURETOR CHANGES

  • Size of air bleed hole in choke valve increased - admits more air, reduces overchoking.
  • Bottom accelerating pump bore cone shaped, eliminates need for accelerating pump inlet ball retainer.

AFB - FOUR BARREL CARBURETOR CHANGES

  • Secondary throttle valves start to open earlier as primary valves are opened. (For improved performance)
  • Primary throttle valves at verti˘al just before kickdown of transmission and 10 degrees past vertical after kick- down. (Assures full throttle performance in direct drive).

VACUUM CHOKE DIAPHRAGM

  • Replaces choke piston on all carburetors.
  • Sealed chamber, not repairable, serviced by replacement only.
  • Vacuum works against diaphragm spring.
  • Eliminates choke piston sticking.
  • Results in new procedures for:
    • Fast Idle cain positioning.
    • Choke vacuum kick adjustment.
    • Checking choke operating clearance.
    • Fast idle speed adjustment.

ADJUSTING FAST IDLE CAM POSITION

(ALL CARBURETORS EXCEPT 4BBL)

  • Position idle screw on lowest step of cam.
  • Should be slight drag on gauge with light closing pressure on choke.
Adjustment:
  • BBD (2 bbl.) - bend stop on choke shaft lever.
  • WW3 and WWC3 (2 bbl.) - bend fast idle rod.
  • BBS and Holley (1 bbl.) - bend fast idle rod.

ADJUSTING FAST IDLE CAM POSITION - AFB - 4BBL

  • Open throttle to allow fast idle screw to clear cam.
  • Insert gauge between choke valve and air horn wall.
  • Close throttle until screw hits cam.
  • Bend fast idle rod so screw lightly contacts middle step but slides to bottom step. Screw must ride against shoulder of middle step.
  • Spring loaded fast idle cam makes this procedure necessary.

CHOKE VACUUM KICK ADJUSTMENT - (All Carburetors)

  • Can be done on or off vehicle.
  • Must be checked with engine not running.
  • Open throttle to let choke close.
  • Energize vacuum diaphragm with minimum of 10" vacuum (use distributor test machine or another engine as vacuum source).
  • Insert gauge between choke valve and air horn and apply light closing pressure.
  • If slight drag is not felt at gauge, adjust by removing and bending choke operating link. (Link must be removed to avoid damage to diaphragm or lever slot while bending).

MEASURING CHOKE OPERATING LINK (All Carburetors)

  • Measure change in link length with 2" micrometer.
  • .010" change in link length means .015" change at choke opening.

CHECKING CHOKE OPERATING LINK CLEARANCE (All Carburetors)

  • With no vacuum at diaphragm, end clearance must exist at slot when choke is fully opened or fully closed. (This is necessary to allow choke full operating range).
  • If not satisfactory, recheck vacuum kick adjustment.
  • If choke is not free, check for bind at choke operating link.

FAST IDLE SPEED ADJUSTMENT (All Carburetors)

  • With engine at operating temperature, connect tachometer - set curb idle speed.
  • Open throttle slightly (transmission in neutral and engine running).
  • Close choke valve 20 degrees and allow throttle to close. Return choke to open position.
  • Fast idle screw should be on lowest step of cam.
  • With engine at normal operating temperature, adjust fast idle speed screw to 700 RPM engine speed (reposition cam and throttle after each screw adjustment for accuracy).

CHRYSLER AND IMPERIAL - ANTI SURGE VENTED CAP

  • Eliminates spillage caused by fuel surge during acceleration. Other non vented caps will not fit. (Their retaining cups are too large for retaining cam on Chrysler and Imperial filler tubes).

ANTI SURGE VENTED CAP

  • Surge of fuel closes anti surge valve, which normally hangs free.
  • Pressure relief valve relieves pressure if any occurs in tank.
  • Vent passages protected by cap.

 

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