Lotus's Elan turns 61 this year
1962, Ferrari fitting live axles, Porsche were a full 2 years away from fitting disc brakes, and Lotus, they released a roadster with 105 horsepower, lightweight aerodynamic coachwork and the suspension, brakes and transmission that was so effective in their racing cars.
61 years ago this October, the Lotus Elan was launched at the Earl’s Court Motorshow. The Elan was an immediate success for Lotus with production spanning 10 years between May 1963 and 1973, by which time just under 9000 were produced.
The Elan officially weighed 672 kgs, but some road tests showed curb weights as low as 1485 kgs.
Instead of using a fiberglass unit-body, the Elan combined a sturdy steel backbone chassis, fully independent suspension, four-wheel disc brakes and Ford-based, Lotus-developed engine, and a the four-speed close-ratio gearbox. The body, still fiberglass, was moulded in upper (body) and lower (floors and wheel-wells) sections and bonded together before being bolted to the chassis.
“Simplify, and add lightness”
The Elan’s engine was quite special, and it’s worth highlighting production engineering team behind that engine was quite a special too with Mike Costin and Keith Duckworth being brought back in from Cosworth Engineering being involved to make several design changes to the cylinder head, reshaping the ports and adding strength.
Based on Ford’s proven ‘Kent’ crossflow engine, the Duckworth developed a dual-overhead-cam cylinder head, and making use of twin Weber carburettors, displacement is often listed as 1.6 L (1,557 cc), its bore and stroke are 82.55 mm × 72.75 mm (3+1⁄4 in × 2.864 in) respectively, for an actual displacement of 1.6 L; 95.0 cu in (1,557.46 cc). This allowed the Twin Cam to be over-bored by up to 0.04 in (1.0 mm) and still remain below the 1600 cc cubic capacity class limit permitted by FIA regulations.
This engine made 105hp at 5,700 RPM and 108-lbs.ft. of torque at 4,000 RPM,
and could zip the car to 60 MPH in 8 seconds and on to 115 MPH, figures that could far outpace an equivalent MGB or TR4 an could even worry and E-type Jaguar.
