Graham Specifications

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Supercharger

Make & Type Graham-centrifugal

Drive Twin V-belt

Ratio, rotor to engine 5.75 to one

Ratio of gearing 4.8 to one

Rotor material Aluminum

Rotor diameter 7 ½ inches

Type bearing Special “cone” worm

Number of bearings Five

Bearing Types:

Worm Shaft Bronze-babbitt

Rotor Shaft Bronze-babbitt

Rotor Shaft Pilot Lead-bronze

Rotor cover type Water jacketed

Engine

Make Graham

Type & number of cylinders L-head, 6cylinders

Bore & Stroke 3 ¼” X 4 3/8”

Cubic inch displacement 217.8”

Brake horsepower @ RPM 93 @ 3800 non-supercharged

120 @ 4000 supercharged

Horsepower rating (AMA) 25.35

Maximum Torque 170 Ft-Lb

Compression at cranking speed 125 lbs non-supercharged

130 lbs supercharged

Firing Order 1-5-3-6-2-4

Engine Mounts 3 point rubber

Engine Speeds (Rev./ mile) Standard axle (4.27)

Overdrive 2255 non-supercharged

2224 supercharged

High gear 3181

Second gear 4930 non-supercharged

4863 supercharged

Low gear 8175 non-supercharged

8064 supercharged

Reverse gear 11069 non-supercharged

10920 supercharged

Engines Speed Optional Axel (4.55)

Overdrive 2402 non-supercharged

2370 supercharged

High gear 3389 non-supercharged

3344 supercharged

Second gear 5252 non-supercharged

5183 supercharged

Low gear 8709 non-supercharged

8594 supercharged

Reverse gear 11793 non-supercharged

11637 supercharged

Cylinder Head

Material Iron

Type High Compression

Compression ratio standard 6.65 to one

No. of optional heads 2

Ratio of optional head 7.00 to one

Ratio of special optional head 7.25 to one

Valves

Intake valve material Chrome nickel steel

Intake valve seat angle 30 degrees

Intake valve head diameter 1 33/64”

Exhaust valve material X.B. steel non-supercharged

X.C.R. steel supercharged

Exhaust valve angle 45 degrees

Exhaust valve head diameter 1 21/64”

Crankcase

Type Integral with cylinders

Material Copper-Chrome Iron

Water jacket type Full length of cylinders

Cylinder bore finish Honed

Crankcase oil capacity 5 Quarts

Crankcase ventilation Cross flow

Crankcase air cleaner Wire mesh

Crankshaft

Material Forged steel

Features Integral counter-weights

Number main bearings Four

Main bearing diameter 2 3/8”

Bearing Journal Lengths:

Front 1 9/32”

Front center 1 ½”

Rear center 1 ½”

Rear 1 47/64”

Bearing type Interchangeable

Bearing material Steel shell, Cadmium silver

Connecting Rods

Material Forged steel

Length 7”

Bearing type Interchangeable

Bearing material Steel shell, Cadmium silver

Bearing diameter and length 2 7/16” X 1 3/16”

Carburetor

Make & Model Carter WA-1

Type Down draft

Outlet Single

Size 1 3/8”

Adjustments Idle only

Fuel System

Gas tank capacity 17 Gallons, US

Fuel feed Mechanical pump

Pump type Diaphragm

Fuel filter Integral with pump

Air cleaner type Oiled copper mesh

Fuel temperature regulation Thermostat non-supercharged

Automatic supercharged

Fuel heating medium Exhaust heat non-supercharged

Water supercharged

Choke control Automatic

Lubrication

Engine lubrication Pressure

Normal Oil pressure 45 Lbs.

Pressure oiling to Entire engine, internal

Crankcase capacity 5 quarts, pus one with filter

Oil pump type Submerged gear

Oil pump drive Geared to camshaft

Chassis lubrication Pressure gun

Number & type fittings 14, Ball end

Pistons & Rings

Piston make & material Bohn-aluminum

Piston type Auto-thermic, steel struts

Piston finish Bearing metal plated

Compression ring width 3/32” two used

Oil control ring width 5/32” two used

Piston pin diameter 13/16”

Camshaft

Drive Link belt

Chain width & length 1” X 23”

Chain pitch ½”

Bearings, number & material 4, Bronze

Cooling System

Type circulating Pump

Pump type Centrifugal-packless

Bearing type Double row ball bearing

Bearing lubrication Not required

Pump circulating capacity 45 Gal. Per minute

Radiator type Cellular

Cooling system capacity 14 Quarts

Water temperature control Thermostat

Fan diameter & blade number 16”, four

Graham restoration