Chassis and body construction

The chassis was constructed of special laminated plywood on the monocoque principle and joined using the synthetic Aerolite 300 adhesive. Small sections are assembled into a whole by gluing and stapling. Localized stress areas were reinforced. There are not many photographs of the chassis but a diagram appears in Frank Costin’s book. A good verbal description interestingly appeared in a review published by “Sports Car and Lotus Owner” (April 1960).


No. of cylinders: 4

Firing order: 1 2 4 3

Capacity: 996.6 c.c.

Bore: 80.9 m.m.

Stroke: 48.4 m.m.

Compression ratio: 8.9:1

No. of valves per cylinder: 2

No. of camshafts: 1

Diameter of inlet valves: 32.2 - 32.3 m.m.

Diameter of exhaust valves: 30.18 - 30.32 m.m.

Carburettor: 2 x Weber 40 DCOE

Make of ignition system: Lucas

Model: D 3AM 4


Make of gearbox: Ford 105E 

No. of gearbox ratios: 4 Forward & Reserve

Type of final drive: Hypoid

Type of differential. Standard Bevel Gears

Final drive ratio: 4.55

Alteranatives: 4.2 - 4.9 - 5.3 - 3.78 - 9.38 - 8.39 - 8.43 - 9.34

No. of teeth: 9/41


Drums brake

Inside diameter front brake drums: 203 mm

Inside diameter rear brake drums: 178 mm

Discs and drums brake

Outside diameter of front disc: 230 mm

Inside diameter of rear brake drums: 178 mm

Front suspension

Rear suspension 

Capacities and dimensions

Overall lenght of car: 384 cm.

Overall width of car: 144 cm.

Overhall height of car: 122 cm.

Front track: 122 cm

Rear track: 122 cm.

Wheelbase: 221 cm.

Ground clerance: 13.2 cm.

Overall weight with water, oil and spare wheel: 495 kgs-

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