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ENGINE SPECS

1952 De Soto 250 Inline Six Engine Specs

GENERAL SPECIFICATIONS

Model Designation: Six Cylinder - S15
Wheel base: 125-1/2
Valve Location: In block
Bore and Stroke: 3-7/16 x 4-1/2
Piston displacement, Cubic Inches: 250.6
Compression ratio: 7.0
Maximum Brake Horsepower: 116 @ 3600 RPM
Maximum Torque Lbs.Ft. @ RPM: 208 @ 1600
Normal Oil Pressure Pounds: 50

TUNE UP SPECIFICATIONS

Spark Plug Make: Auto-Lite AR8
Spark Plug Gap, Inch: .035
Firing Order: 153624
Ignition Timing: 2 degrees BTDC Timing mark location: Vib. Damp.
Engine Idle Speed, RPM:  475
Cylinder Head Torque Lbs.Ft.: 85
Compression Pressure & Cranking Speed: 120 Min.

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale:
Removed from above
Shim thickness to use: .002
Pounds on Pull Scale: 5 to 7
Rings: (Fit rings in tapered bores for clearance shown in tightest portion of ring travel.)
Compression: .015; Oil: .015
Clearance in groove: Compression: Top ring: .0025-.004; second ring: .002-.0035; Oil: .001-.0025
Wristpin Diameter, Inch: .8591-.8593

VALVE SPECIFICATIONS

Operating Clearance:
     Intake: .008 Hot  Exhaust: .010 Hot
Clearance for timing Intake: .014
Valve Seat Angle, degrees: 45
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
         Intake opens: 12 degrees BTDC
         Exhaust Closes: 6 ATDC
Valve Spring Pressure Pounds at Inches Length:
     Spring: 40 @ 1-3/4
Valve Stem Clearance:
    Intake: .001-.003
    Exhaust: .002-.004

ENGINE BEARING SPECIFICATIONS

Connecting Rod Bearings:
    Journal Diameter, Inches: 2.124 - 2.125
    Bearing Clearance, Inch: .0005-.0015
    Rod End Play, Inch: .006-.011
    Rod Bolt Tension, Lbs.Ft.: 45-50
Main Bearings:
    Journal Diameter, Inches: 2.499-2.500
    Bearing clearance: .0005-.0015
    Shaft End Play: .003-.007 (Thrust taken by rear bearing)
    Main bolt tension, Lbs.Ft.: 80-85

CAPACITY DATA

Cooling System:
    Without heater: 15 quarts
    With heater: 16 quarts
Fuel Tank: 17 gallons
Engine Oil: 5 quarts
Transmission: 2-3/4 pints (with semi-automatic transmission: 3 pints)
Rear Axle: 3-1/4 pints

AUTO-LITE DISTRIBUTOR SPECIFICATIONS

Distributor part number: 1AT-4012 (distributor rotates clockwise)
Cam Angle, degrees: 39
Breaker Point opening, Inch: .020 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 @ 450
   Full Advance: 10 degrees @ 1425
Vacuum Advance Data:
   Degrees @ Inches of Mercury:
       Advance starts: 1 @ 6
       Full Advance: 9 @ 15

AUTO-LITE GENERATOR SPECIFICATIONS

Generator Number: GGW-6001J, GGW-6007B, GGW-6008B, GGW-6008C (generator rotates clockwise, 6 volts, Positive Ground)
Generator output: 45 @ 2125 RPM
Brush Spring Tension: 35-53 oz.
Field Current: 1.4-1.5 at 5 volts

AUTO-LITE REGULATOR SPECIFICATIONS

Regulator Number: VBE-6001A
Cutout Relay:
    Voltage to close points: 6.5
    Reverse current to Open Points (Amps): 4-6
    Armature Air Gap: .031
Voltage Regulator Setting: 7.3 volts
Current Regulator Setting: 45 amps
Current and voltage armature air gap, Inch: .048

AUTO-LITE STARTING MOTOR SPECIFICATIONS

Part number: MCL-6109, MCL-6116, MCL-6117(starter rotates clockwise)
Bush Spring Tension, Ounces: 42-53
No Load Test: 65 amps, 5.0 volts @ 4900 RPM
Torque Test: 410 Amps, 2.0 volts, Torque, Lbs.Ft.: 8.0

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
    Limits: -1 to -3
    
Desired: -2
Camber, Degrees
    Limits: -3/8 to +3/8 
    Desired:
0
Toe-In, Inches: 0 to 1/16
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 to 6-1/2

·  Understanding Second Chance Garage's Vintage Auto Engine Specs



 

 

 

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