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Zimmer: 910 baseWhen the Sports Car Club of America introduced a 2-litre limit for sports car racing, early in the 1970s, Jack Zimmer had the choice of fitting a smaller engine into his (2.2-litre) Porsche 910, or withdrawing it from competition. He decided to convert the racing car into a stylish, exciting machine suitable for use on the public highways.
Zimmer contacted Charles Pelly, a freelance designer, who built several scale models, and Dick Troutman in California was then given the job of carrying out the body conversion.
Aluminium was chosen for the body skin, and the angles and curvatures were clearly going to call for a high degree of skill. The conversion took 14 months to complete, and cost the equivalent of DM 100,000. Ironically, the four-cam eight-cylinder engine was taken out, and replaced by a 2-litre 911 engine with fuel injection, tuned to over 200 bhp; the car's top speed was estimated at 136 mph (220 km/h).
The conventional tubular frame of the 910, built for racing in the 1967/68 seasons, was retained, along with the original Porsche racing five-speed transmission, and limited slip differential, located behind the engine. Twin aluminium fuel tanks with a total capacity of 19.8 gal (90 litres) were used, and the standard ventilated disc brakes also featured. The wheel rims were 9.5 x 13 at the front and 13 x 13 at the rear, equipped with Firestone tyres (500/950 x 13 front, 600/1300 x 13 rear).
The aluminium body consisted of three large sections - the front, the cockpit and the rear - though the roof was made of steel. The windows were taken from the Cadillac range and altered, and standard Porsche 911 instruments were used."
Picture 1: "Jack Zimmer and his racing Porsche 910 during its conversion to road car trim. The futuristic car was reskinned in aluminium, and the job took fourteen months to complete."
Picture 2: "The 910's tubular frame was retained, although the interior fittings were far removed from the normal racing equipment."
Picture 3: "The side and rear views of the Zimmer 910 were quite unusual, and gave no hint of Porsche ancestry. The eight-cylinder engine was replaced by a tuned 911, 2-litre, six-cylinder unit developing over 200 bhp."Source: Porsche Specials by Lothar Boschen and Jürgen Barth. English language translation © 1986 Patrick Stephens Limited. ISBN 0-85059-802-8
