ENGINE SPECS

1951 Chrysler 251 Inline 6 Engine Specs

GENERAL SPECIFICATIONS

Model Designation: Windsor 6: C51

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: 7.00

Maximum Brake Horsepower: 116 @ 3600 RPM

Maximum Torque Lbs.Ft. @ RPM: 208 @ 1600 RPM

Normal Oil Pressure Pounds: 60

TUNE UP SPECIFICATIONS (all models)

Spark Plug Make: Auto-Lite AR-8

Spark Plug Gap, Inch: .035

Firing Order: 153624

Timing Mark: 0; location: Vib. Damper

Engine Idle Speed, RPM: 475

Cylinder Head Torque Lbs.Ft.: 70

Compression Pressure & Cranking Speed: 120 min.

Voltage & Polarity: 6 volts, positive ground

PISTON AND RING SPECIFICATIONS

Fitting Pistons with Scale: Pistons removed from above. Shim thickness: .001

Pounds on a Pull Scale: 5 to 7

Ring End Gap: In tapered bores, fit rings 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

Valve Seat Angle, degrees: 45

Clearance for Timing Intake: .014

Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 12 BTDC
Exhaust Closes: 6 ATDC

Valve Spring Pressure Pounds at Inches Length:
Inner 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 on 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 (w/torque converter, engine & converter combined require 12 quarts, 13 when filter is changed)

Transmission: Manual: 2-3/4 Pints; for semi-automatic trans: 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

Condenser Capacity: .25-.28 Mfds.

Breaker Arm Spring Tension: 17-20 Oz.

Centrifugal Advance: (degrees at RPM of distributor)
    Advance starts: 1 @ 450 RPM
    Full Advance: 10 @ 1425 RPM
Vacuum Advance (degrees @ Inches of Mercury)
    Advance Starts: 1 @ 6
    Full Advance: 9 @ 15

AUTO-LITE GENERATOR SPECIFICATIONS

Generator Number: GGW-6001J; GGU-6001G; GGU-6001T, GGU-6001R, GGJ-6003A, GGJ-6004A (generator rotates clockwise, 6 volts, Positive Ground)

Generator output: GDW-6001J: 45 35 amps @ 2125 RPM; GGU-6001G, GGU-6001T, GGU-6001R: 50 amps @ 1750 RPM; GGJ-6003A, GGJ-6004A: 55 amps @ 1700 RPM

Brush Spring Tension: GGW-6001J, GGU-6001G, GGU-6001T, GGU-6001R: 35-53 oz.; GGJ-6003A, GGJ-6004A: 34-41

Field Current at 5 Volts: GGW-6001J: 1.4-1.5; all others: 1.4-1.6

AUTO-LITE REGULATOR SPECIFICATIONS

Regulator Number: VBE-6001A, VAV-6001B, VBF-6001A

Cutout Relay:
    Voltage to close points: 6.5
    Reverse current to open points: 4-6
    Armature Air Gap: VBE-6001A, VBF-6001A: .031 inches; all others: .034

Voltage Regulator Setting: 7.3 volts

Current and Voltage Armature Air Gap: .048 inches

Current Regulator Setting: VBE-6001A: 45 amps; VAV-6001B: 50 amps; VBF-6001A: 55 amps

AUTO-LITE STARTING MOTOR SPECIFICATIONS

Part number: MCL-6109 (rotates clockwise)

Bush Spring Tension, Ounces: 42-53

No Load Test: 65 amps, 5 volts @ 4900 RPM

Torque Test: 410 Amps, 2.0 volts; Torque: 8.0 ft/lbs.

WHEEL ALIGNMENT SPECIFICATIONS

Caster, Degrees
Limits: -1 to -2
Desired: -1-1/2

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, or Steering Axis Degrees: (If king pin or spindle support angle are incorrect, but camber is correct, look for bent suspension arms or steering knuckle support)
5 to 6-1/2

· Understanding Second Chance Garage's Vintage Auto Engine Specs