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Technical Stuff

 
S4C S4D S6D
Approx. number built 250 50 12
Years of manufacture 1934-38 1937-38 1935-46
Wheelbase 9´2" 9´4.25" 9´4.25"
Track  front/rear 4´3" / 4´3" 4´3.25" / 4´4.5" 4´3.25" / 4´4.5"
Capacity, no of cylinders 1466 cc, 4 1597 cc, 4 2599 cc, 6
Bore x Stroke (mm) 69 x 98 72 x 98 75 x 98
Firing order 1-3-4-2 1-3-4-2 1-4-2-6-3-5
BHP at revs/min 55 (70) at 4500 65 at 4500 90 at 4500
Compression ratio 6:1 (6.5:1) 6:1 6:1
Inlet camshaft no 13010 13010 BS1273
Inlets close 120 mm; 47o aft. B.D.C 47o aft. B.D.C 71o aft. B.D.C
Inlet tappet clearance 0.004" 0.004" 0.004"
Exhaust camshaft no 13009 13009 BS1272
Exhausts open 125 mm; 49o bef. B.D.C 49o7´ bef. B.D.C 68o24´ bef. B.D.C
Exhaust tappet clearance 0.006" 0.006" 0.006"
Original carburetor's) Solex 30 BFHD             (Solex 35 BFHD or 2x30 BDHD or 2x11/4" SU´s) Solex 35 BFHD 2x11/4" SU´s
Replacement Solex carb. 30 AHD 35 ´HBFD
Fuel feed S.U. electric pump S.U. electric pump S.U. electric pump
Petrol tank capacity 10 gallons 11 gallons 14 - 15 gallons
Petrol consumption 30 m.p.g.(25/30 m.p.g.) 30 m.p.g. 22 m.p.g.
Number of main bearings 3 3 4
Oil pressure 40 p.s.i. (60 p.s.i.) 40 p.s.i. 40 p.s.i.
Sump capacity 10 pints 10 pints 14 pints
Gearbox capacity 2½ pints 2½ pints 3 pints
Back axle capacity 2½ pints 3 pints 3 pints
H.T. supply Scintilla Vertex / 12 V coil Scintilla Vtx / 12 V coil Scintilla Vtx / 12 V coil
Distributor Lucas DK4A Lucas DK4A Lucas DU6A
Contact breaker gap 0.015" 0.015" 0.015"
Sparking plugs 18mm K.L.G K.SS.I    (K.L.G. B.I.) 18mm K.L.G. B.I. 18mm K.L.G. B.I.
Sparking plug gap 0.018" 0.018" 0.018"
Earthing pole Negative Positive Positive
Starter/(Dynamotor) Rotax DM 11/4 Dynamotor Lucas M418A Lucas M418A
Dynamo Lucas CH5 Lucas CH5
Clutch Borg and Beck 8" Borg and Beck 9" Borg and Beck 9"
Brakes Bendix 10" Lockheed 12" Lockheed 12"
Steering type / oil Marles Weller - SAE140 Rack & Pinion - grease Rack & Pinion - grease
Front suspension /shock abs. Semi elliptic - Hartford Independent -  wooden rings Independent -  wooden rings
Rear suspension /shock abs. Quarter elliptic - Hartford Quarter elliptic -  Luvax vane Quarter elliptic - Luvax vane
Road wheels Rudge Whitworth wire    knock on Jordan pressed steel knock on Jordan pressed steel knock on
Tires 500 x 18 6.25 x 16 6.25 x 16
Pressure front/rear lbs./in 26 / 26 18 / 20 18 / 20
Toe-in setting 1/8" - 3/16" 2mm each side 2mm each side

The British Salmson cars were designed by engineers and manufactured by craftsmen trained for the quality standards required for the production of aero engines. A 2 years guarantee were given on the cars when new. This was exceptionally good in those days when the cars were new.

 

S4C 12/70 Engine with direct coupled Rotax Dynamotor

 

Twin Overhead Camshafts with adjustable vertical shaft drive