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ENGINE SPECS

1956 De Soto Fireflite 330 V8 Engine Specs

GENERAL SPECIFICATIONS

Model Designation: FirefliteDome V8 - S24
Wheel base: 126
Valve Location: In block
Bore and Stroke: 3.72 x 3.8
Piston displacement, Cubic Inches: 330
Compression ratio: 8.5
Maximum Brake Horsepower: 255 @ 4400 RPM
Maximum Torque Lbs.Ft. @ RPM: 350 @ 3200
Normal Oil Pressure Pounds: 50-65

TUNE UP SPECIFICATIONS

Spark Plug Make: Auto-Lite 4R-52
Spark Plug Gap, Inch: .035
Firing Order: 18436572 From front to rear Left bank: 1-3-5-7; Right bank: 2-4-6-8
Ignition Timing: 4 degrees BTDC Timing mark location: Vib. Damp.
Engine Idle Speed, RPM:  475
Cylinder Head Torque Lbs.Ft.: 85
Compression Pressure & Cranking Speed: 130 Min.

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale:
Removed from above
Shim thickness to use: .002
Pounds on Pull Scale: 5 to 12
Rings: (Fit rings in tapered bores for clearance shown in tightest portion of ring travel.)
Compression: .010; Oil: .010
Clearance in groove: Compression: .001-.0025; Oil: .001-.0025
Wristpin Diameter, Inch: .9216-.9218

VALVE SPECIFICATIONS

Operating Clearance:
     Intake: 0  Exhaust: 0
Clearance for timing Intake: 0
Valve Seat Angle, degrees: 45
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
         Intake opens: 15 BTDC
         Exhaust Closes: 15 ATDC
Valve Spring Pressure Pounds at Inches Length:
     Inner Spring: 72 @ 1.69; No Outer Spring
Valve Stem Clearance:
    Intake: .002
    Exhaust: .003

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings:
    Journal Diameter, Inches: 2.249 - 2.250
    Bearing Clearance, Inch: .0005-.0015
    Rod End Play, Inch: .006-.014
    Rod Bolt Tension, Lbs.Ft.: 45-50
Main Bearings:
    Journal Diameter, Inches: 2.5
    Bearing clearance: .0005-.0015
    Shaft End Play: .002-.007 (Thrust taken by center bearing)
    Main bolt tension, Lbs.Ft.: 80-85

CAPACITY DATA

Cooling System:
    Without heater: 23 quarts
    With heater: 24 quarts
Fuel Tank: 21 gallons
Engine Oil: 4 quarts
Transmission: Automatic: 10 quarts
Rear Axle: 3-1/2 pints

AUTO-LITE DISTRIBUTOR SPECIFICATIONS

Distributor part number: 1BJ-4302 (distributor rotates clockwise)
Cam Angle, degrees: 31
Breaker Point opening, Inch: .017 Plus or minus .002
Condenser Capacity: .25-.28 Mfds.
Breaker Arm Spring Tension: 17-20 Oz.
Centrifugal Advance: (degrees at RPM of distributor)
   Advance starts 1 degrees @ 375
   Full Advance: 8-1/2 degrees @ 2200
Vacuum Advance Data:
   Degrees @ Inches of Mercury:
       Advance starts: 1 @ 6
       Full Advance: 12-1/2 @ 15

AUTO-LITE GENERATOR SPECIFICATIONS

Generator Number: GJC-7002A, GJC-7003B (generator rotates clockwise, 12 volts, Positive Ground)
Generator output: 30 @ 2250 RPM
Brush Spring Tension: 18-36 oz.
Field Current: 1.2-1.3 at 10 volts

AUTO-LITE REGULATOR SPECIFICATIONS

Regulator Number: VRX-6201A
Cutout Relay:
    Voltage to close points: 13.4
    Reverse current to Open Points (Amps): 8.2 - 9.3
    Armature Air Gap: .031
Voltage Regulator Setting: 14.4 volts
Current Regulator Setting: 34 amps
Current and voltage armature air gap, Inch: .048

AUTO-LITE STARTING MOTOR SPECIFICATIONS

Part number: MDF-6001 (starter rotates clockwise)
Bush Spring Tension, Ounces: 42-53
No Load Test: 60 amps, 10 volts @ 3200 RPM
Torque Test: 240 Amps, 4.0 volts, Torque, Lbs.Ft.: 6.5

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
    Limits: -2 to 0
    
Desired: -2; w/power steering: 0
Camber, Degrees
    Limits: -1/8 to +5/8 
    Desired:
Left: +1/2, Right: 0
Toe-In, Inches: 1/8
Toe-Out on Turns, Degrees: (If toe-out is incorrect, when other adjustments are correct, look for bent steering arms.)
    Outer wheel: 20
    Inner Wheel: 20-1/2 to 22-1/2
Kingpin Angle, Degrees: 5-1/2 at 0 camber

·  Understanding Second Chance Garage's Vintage Auto Engine Specs


 
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