Allard J2 group S (1950)
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Specifications

173 units built (90 J2, 72 J2X, 11 J2X Le Mans)
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Click here for J2X
Click here and here and here for J2X Le Mans
Download here J2 chassis drawings
Download here J2X chassis drawings

Ford Flathead Mercury, V8 (90º) cyl, 4 stroke, petrol engine
3917cc, 81 x 95 mm
95 BHP (69.92 KW) @ 3600 RPM
181 Ft-Lbs (245 NM) @ 2000 RPM

Cadillac 331 OHV Technical information
1949
aspiration, natural with 1 x Carter WCD 722S two-barrel carburetor
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GENERAL SPECIFICATIONS
Model Designation: Series 60S, Series 61, Series 62, Series 75
Wheel base: Series 60S: 133; Series 61: 126; Series 62: 126; Series 75: 136
Valve Location: In head
Bore and Stroke: 3-13/16 x 3-5/8
Piston displacement, Cubic Inches: 331.0
Compression ratio: 7.50
Maximum Brake Horsepower: 160 @ 3800 RPM
Maximum Torque Lbs.Ft. @ RPM: 312 @ 1800 RPM
Normal Oil Pressure Pounds: 35
TUNE UP SPECIFICATIONS (all models)
Spark Plug Make: AC 48X
Spark Plug Gap, Inch: .035
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
Timing Mark: "A" mark for premiurm fuel; "C" mark for regular fuel; location: Vib. Damper
Engine Idle Speed, RPM: Standard transmission: 375; w/automatic 375 (in drive)
Cylinder Head Torque Lbs.Ft.: 65-70
Compression Pressure & Cranking Speed: 140
Voltage & Polarity: 6 volts, negative ground
PISTON AND RING SPECIFICATIONS
Fitting Pistons with Scale: Pistons removed from above. Shim thickness: .002
Pounds on a Pull Scale: 11
Ring End Gap: In tapered bores, fit rings in tightest portion of ring travel
Compression: .007
Oil: .007
Clearance in Groove: Compression: .0022-0035; Oil: .0015-.003
Wristpin Diameter, Inch: 1.000
VALVE SPECIFICATIONS
Operating Clearance:
Intake: 0 Exhaust: 0
Valve Seat Angle, degrees: 44
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 15 BTDC
Exhaust Closes: 40 ATDC
Valve Spring Pressure Pounds at Inches Length:
Inner Spring: 60 @ 1-11/16
Valve Stem Clearance: Intake: .001-.0025; Exhaust: .0015-.0035
ENGINE BEARING SPECIFICATIONS
Connecting Rod Bearings:
Journal Diameter, Inches: 2.2488-2.2493
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .008-.014
Rod Bolt Tension: Lbs.Ft.: 40-45
Main Bearings:
Journal Diameter, Inches: 2.4990-2.4995
Bearing clearance: .0008-.0025
Shaft End Play: .001-.005 (Thrust on Rear Bearing)
Main Bolt Tension: Lbs.Ft.: 90-100
CAPACITY DATA
Cooling System:
Without heater: 18 quarts
With heater: 19
Fuel Tank: 20 gallons
Engine Oil: 5 quarts
Transmission: w/out overdrive: 2-1/2 pints; Automatic: 12 quarts
Rear Axle: 5 pints

J2X '51
Cadillac, V8 (90º) cyl, 4 stroke, petrol engine
5416cc, 96.8 mm x 92.0 mm
7.5:1
180-200 bhp (134 kW)
437 Nm (322 ft·lb) (44.6 kgm) at 2400 rpm
5 main bearings
aspiration, natural with 1 x Carter WCD 845S two-barrel or 1 x Rochester BB two-barrel Model 7004200 (manual)
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GENERAL SPECIFICATIONS
Model Designation: Series 60S, Series 62, Series 75
Wheel base: Series 60S: 130; Series 62: 126; Series 75: 146-3/4
Valve Location: In head
Bore and Stroke: 3-13/16 x 3-5/8
Piston displacement, Cubic Inches: 331.0
Compression ratio: 8.25
Maximum Brake Horsepower: 210 @ 4150 RPM
Maximum Torque Lbs.Ft. @ RPM: 330 @ 2700 RPM
Normal Oil Pressure Pounds: 35
TUNE UP SPECIFICATIONS (all models)
Spark Plug Make: AC 46-5
Spark Plug Gap, Inch: .035
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
Timing Mark: "A" mark for premiurm fuel; "C" mark for regular fuel; location: Vib. Damper
Engine Idle Speed, RPM: Standard transmission: 450; w/automatic 400 (in drive)
Cylinder Head Torque Lbs.Ft.: 65-70
Compression Pressure & Cranking Speed: 150
Voltage & Polarity: 12 volts, negative ground
PISTON AND RING SPECIFICATIONS
Fitting Pistons with Scale: Pistons removed from above. Shim thickness: .002
Pounds on a Pull Scale: 11
Ring End Gap: In tapered bores, fit rings in tightest portion of ring travel
Compression: .010
Oil: .010
Clearance in Groove: Compression: .0017-0035; Oil: .0015-.003
Wristpin Diameter, Inch: 1.000
VALVE SPECIFICATIONS
Operating Clearance:
Intake: 0 Exhaust: 0
Valve Seat Angle, degrees: 44
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 22 BTDC
Exhaust Closes: 27 ATDC
Valve Spring Pressure Pounds at Inches Length:
Inner Spring: 60 @ 1-11/16
Valve Stem Clearance: Intake: .0005-.0025; Exhaust: .001-.0025
ENGINE BEARING SPECIFICATIONS
Connecting Rod Bearings:
Journal Diameter, Inches: 2.2488-2.2493
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .008-.014
Rod Bolt Tension: Lbs.Ft.: 40-45
Main Bearings:
Journal Diameter, Inches: 2.4990-2.4995
Bearing clearance: .0008-.0025
Shaft End Play: .001-.005 (Thrust on Rear Bearing)
Main Bolt Tension: Lbs.Ft.: 90-100
CAPACITY DATA
Cooling System:
Without heater: 19-3/4 quarts
With heater: 20-3/4 quarts
Fuel Tank: 20 gallons
Engine Oil: 5 quarts

J2X LM '52
Cadillac, V8 (90º) cyl, 4 stroke, petrol engine
5416cc, 96.8 mm x 92.0 mm
9.0:1
184.0 kW / 250-270 HP @ 5000 rpm
508 Nm / 375 ft-lb @ 2800 rpm
2 valves / cylinder, OHV
Aspiration Naturally Aspirated with 2 Rochester Carburetors
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
water cooled
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GENERAL SPECIFICATIONS
Valve Location: In head
Bore and Stroke: 3-13/16 x 3-5/8
Piston displacement, Cubic Inches: 331.0
Compression ratio: 9.1
Maximum Brake Horsepower: 250 @ 4600 RPM, El Dorado: 270 @ 4800 RPM
Maximum Torque Lbs.Ft. @ RPM: 345 @ 2800 RPM, El Dorado: 345 @ 3200 RPM
Normal Oil Pressure Pounds: 35
TUNE UP SPECIFICATIONS (all models)
Spark Plug Make: AC 44-5
Spark Plug Gap, Inch: .035
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
Timing Mark: "A" mark for premiurm fuel; "C" mark for regular fuel; location: Vib. Damper
Engine Idle Speed, RPM: w/automatic 400 (in drive)
Cylinder Head Torque Lbs.Ft.: 65-70
Compression Pressure & Cranking Speed: 165 min.
Voltage & Polarity: 12 volts, negative ground
PISTON AND RING SPECIFICATIONS
Fitting Pistons with Scale: Pistons removed from above. Shim thickness: .002
Pounds on a Pull Scale: 11
Ring End Gap: In tapered bores, fit rings in tightest portion of ring travel
Compression: .010
Oil: .010
Clearance in Groove: Compression: .0017-0035; Oil: .0015-.003
Wristpin Diameter, Inch: 1.000
VALVE SPECIFICATIONS
Operating Clearance:
Intake: 0 Exhaust: 0
Valve Seat Angle, degrees: 44
Valve Timing: (BTDC = before top dead center; ATDC = after top dead center)
Intake opens: 19 BTDC
Exhaust Closes: 30 ATDC
Valve Spring Pressure Pounds at Inches Length:
Inner Spring: 60 @ 1-11/16
Valve Stem Clearance: Intake: .0005-.0025; Exhaust: .001-.0025
ENGINE BEARING SPECIFICATIONS
Connecting Rod Bearings:
Journal Diameter, Inches: 2.2488-2.2493
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .008-.014
Rod Bolt Tension: Lbs.Ft.: 40-45
Main Bearings:
Journal Diameter, Inches: 2.4990-2.4995
Bearing clearance: .0008-.0025
Shaft End Play: .001-.005 (Thrust on Rear Bearing)
Main Bolt Tension: Lbs.Ft.: 90-100
CAPACITY DATA
Cooling System:
Without heater: Series 60, 62: 18 quarts; With heater: 20-1/3 quarts
Without heater: Series 75: 18 quarts; With heater: 22-4/5 quarts
Fuel Tank: 20 gallons
Engine Oil: 5 quarts
Transmission: Automatic: 12 quarts
Rear Axle: 5 pints

Chrysler Hemi 331 Firepower, V8 (90o) cyl, 4 stroke, petrol engine
5424cc, 96.8 x 92.1 mm
7.5:1
300 HP / 5200 rpm
block deck height 263.4mm, cast bell housing in the back of the block, bore spacing 115.9mm
forged steel cross plane crankshaft with 5 main bearings 63.5mm diameter, connecting rod length between centers 168.3mm with 57.15mm big end bearing diameter
1 side camshaft (OHV), 2 valves / cyl - 16 valves total. 46mm inlet valve diameter, 38.1mm exhaust valve diameter. 9.5mm stem diameter, 127.8mm valves length
aspiration: natural with 4 dual-throat downdraft Zenith carburetors
6V battery 130 Amp/Hrs capacity, Autolite Coil for ignition. Firing Order: 1-8-4-3-6-5-7-2, (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
water cooled

Buick 303 of 1949
Oldsmobile Rocket 303, V8 (90º) cyl, 4 stroke, petrol engine
4951cc, 95 x 87.31 mm
7.25:1
135 hp (101 kW) @ 3600 rpm, 253 lb·ft (343 N·m) @ 1800 rpm
cast iron block 237mm deck height, 117.5mm bore spacing with 10 x 7/16" head bolts
counterweighted forged steel crankshaft with 5 main bearings, number 1 to 4 of 63.5mm diameter, and number 5 of 66.7mm diameter
forged steel connecting rods with 57.15mm big end bearing diameter and 168.3mm distance between centers
2 valves / cylinder, OHV. 44.5mm inlet valve diameter, 36.5mm exhaust valves diameter
aspiration, natural with 1 x 2-barrel carburetor
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
water cooled

Buick 303 of 1952
Oldsmobile Rocket 303 Super 88, V8 (90º) cyl, 4 stroke, petrol engine
4951cc, 95 x 87.31 mm
7.5:1
160 hp (120 kW) @ 3600 rpm, 265 lb·ft (359 N·m) @ 1800 rpm
cast iron block 237mm deck height, 117.5mm bore spacing with 10 x 7/16" head bolts
counterweighted forged steel crankshaft with 5 main bearings, number 1 to 4 of 63.5mm diameter, and number 5 of 66.7mm diameter
57.15mm big end bearing diameter
2 valves / cylinder, OHV. 44.5mm inlet valve diameter, 36.5mm exhaust valves diameter
aspiration, natural with 1 x 4-barrel carburetor
Firing Order: 18436572 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)
water cooled

3 speed manual gearbox
Aluminum body on box-section steel frame chassis
Front suspension swing axle, coil springs, hydraulic shock absorbers, J2X: radius arms ahead of the front axle
rear suspension DeDion axle, twin radius arms, coil springs, telescopic shock absorbers
Marles worm-and-roller steering
drum brakes all-round, inboard at the rear
Length 3810 mm (150 in)
Width 1500 mm (59.1 in)
Height 876 mm (34.5 in)
Wheelbase 2438 mm (96 in)
Track (fr/r) 1295 mm (51 in) / 1245 mm (49 in)
wheels, 16"
900kg
J2X Le Mans: 975kg
J2R: 1000kg
fuel tank, 210 lt


Results in famous races (until 1952) and in WSCC (1953+)

Season
Car entry, chassis number Car number/ result
Targa Florio Mille Miglia Carrera Pan Toscana Le Mans Paris Calabria
Date 2/4 23/4 10/5 4/6 25/6 23/7 6/8
Team 1080km 1600km 3000km 680km 24h 12h 720km
S. H. Allard, J1578 (Cadillac 5434cc) dnf #4, 3rd
Total points
8
8
Statistics
Works Starts/finishes 2/1 1/0 1/1
Drivers Team entries and car number
S. H. Allard
Sydney Allard + 4
Tom Cole 4

Allard_J2_1946-1951_287.jpg Source
J2
Allard-Le-Mans.jpg Source
J2
al1952j251235405.jpg Source
J2
allard-sports-cars-10.jpg Source
J2X
Allard_J2X-2138_01_450.JPG Source
J2X
allard_j2x_le_mans_large_23637.jpg Source
J2X Le Mans
1951-allard-j2-project-frame-front.jpg Source
J2 front
48685-500-0.jpg?rev=2 Source
J2X front

Drawings

allard_j2x_competition-17464.jpg Source
allard-j2-1959.gif Source

Cadillac 331 engine

331-ci.jpg Source
pinoffset.jpg Source

Steering

Marles-parts-list.jpg Source
Marles
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