Background
The heart of any great car is a great engine, and enigmatic Lotus boss Colin Chapman knew the company would need something more powerful than the Lotus Twin Cam, for a new range of sports cars that would be topped by the Esprit.
A 2-litre, double overhead, cam 4-valve per cylinder slant four was in development by Lotus (Chapman envisaged it being the basis of a future 4-litre V8), but with the cylinder head finalised they still had no block designed to fit it to.
GM’s Vauxhall had, however, launched a 1973cc slant four a few years earlier, with an 8-valve iron head. The bore spacings matched the new Lotus head, so the Norfolk firm bought 10 blocks and four engines, and development of the Lotus 907 engine began in earnest. The new powerplant was production ready in 1970 and Chapman did a deal with Jensen to sell the 15,000 907s for the new Jensen Healey sports car, the money from which he ploughed back into the development of the Esprit.
Apart from financial rewards, this deal also meant that any 907 teething problems could be ironed out in the Jensen (warped cylinder liners anyone?) so that by the time the Esprit was ready for unveiling the new engine was debugged and ready for action.
The Lotus Excel sports car was launched in 1982, and was given the designation Type 89. It was similar in silhouette to the Eclat, on which it was based, but it had a softer nose, together with integrated lights, bumper and spoiler. The stylish 2+2 sports coupé was intended for those for whom the Esprit was a bit too hardcore.
Lotus had just dome a deal with Toyota to exchange expertise and one result was that the Excel used the gearbox, driveshafts differential wheels and door handles from the Japanese companies Supra sports car, while retaining a development of the Lotus 907 engine, the 912, by now tuned to produce 180bhp in the Excel SE. Fitted with two twin choke Dell'Orto DHLA 45 carburettors, and in the same tune as used in the Esprit Series 3, it gave the Excel a 0-60 mph time of 7.0 seconds, and a top speed of 135mph.
The Excel SE gained a reputation for good cornering and handling characteristics due, in part, to its 50:50 weight distribution. It had a galvanized steel chassis, firmer rear suspension that earlier cars, a five speed Toyota gearbox, disc brakes all round, and increased passenger space. The ten year production run ended in 1992, after 2,159 Excels had been built.







