90 years of the Autocar road test: Design and engineering

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Nothing quickened the pulse of the 1980s road tester more dramatically than a dose of forced induction, more specifically turbocharging. But the use of engine-driven superchargers goes back to the beginning of the internal combustion engine’s life in the 1880s. Our 1928 road testers got their first taste of supercharged horsepower with the Mercedes-Benz Model K, which used a blown 6.3-litre straight six making 160bhp.

Turbochargers are almost ubiquitous today but the technology took longer to take off – and an aviation analogy is apt, because turbochargers were first used on aero engines in the 1930s. The development of turbochargers carried on through World War II, with the first appearing on a production car on the Oldsmobile Cutlass Jetfire in 1962, although Europe had to wait until 1973 for BMW’s 2002 Turbo.

Cool as it was, the 2002 didn’t quite have the impact on the schoolboy senses as Porsche’s 911 Turbo, which was launched a year later at the Paris show. The words ‘Porsche’ and ‘Turbo’ pretty much defined high- performance motoring in the 1970s.

What about diesels? Our forebears would have found their first production diesel car at the 1933 Paris show. Citroën was displaying its charmingly named Rosalie, which was available with an optional 1.7-litre diesel engine. Then in 1936 Mercedes launched a diesel saloon, called the 260D.

There’s a case for saying that of all automotive developments, it’s the diesel engine that took longest to perfect. I’ve never driven a 260D but I suspect it was a bit of an old rattler, and early 1980s diesels were certainly harsh on the ears and joints. Things looked up in 1978 when Mercedes launched the turbocharged 300SD, and Peugeot followed the year after with the 604. Unfortunately, and as has so often been the case, us Brits were fiddling with the technology far earlier but failed to get it into production. Rover had been experimenting with intercooled turbodiesels as early as 1963.

A far more exotic Rover project was its jet turbine programme. The most famous car, ogled at by generations in London’s Science Museum, was the JET1. This convertible concept was built in 1949/50 and looks like it could just about crack 70mph but actually managed more than 150mph. Chrysler got nearest to productionising a gas turbine road car with its 1963 Turbine, but in the end only 50 were built.

Chrysler and Rover aren’t the only firms to work slavishly at powerplant concepts others have shied away from. At the 1964 Frankfurt show, NSU unveiled the Wankel Spider (road test 2043), the first production car to use a rotary engine. NSU went on to make the stunning RO80 which, when it went out of production in 1977, was the last car to wear the marque’s badge. Mazda produced its rotary-engined Cosmo 110S in 1967 and went on to iron out most of the Wankel’s inherent problems, in particular sealing of the rotor tips.

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