Originally, the Range Rover was fitted with a detuned 130 hp (97 kW) version of the Buick-derived Rover V8 engine. In 1984, the engine was fitted with Lucas fuel injection, boosting power to 155 hp (116 kW). The 3. 5-litre (3,528 cc) engine was bored out to a displacement of 3. 9 litres (3,947 cc) for the 1990 model year, and 4. 2-litre (4,215 cc) in 1992 (1993 model year) for the 108-inch Long Wheelbase Vogue LSE (County LWB [long wheelbase] in North America). One of the first significant changes came in 1981, with the introduction of a four-door body. Shortly after twin thermo fan technology was introduced to reduce significant overheating problems 1970s models experienced in Australia. In 1988, LR introduced a 2. 4-litre turbodiesel (badged Vogue Turbo D) with 112 bhp (84 kW), manufactured by Italian VM Motori. The same engine was available in the Rover SD1 passenger car. The diesel project was codenamed project Beaver. During the project, 12 world records were broken, including the fastest diesel off-roader to reach 100 mph (160 km/h), and the furthest a diesel off-roader has travelled in 24 hours. In 1990 project Otter was unveiled. This was a mildly tuned 2. 5-litre, 119 bhp (89 kW) version of the 'Beaver' 2. 4. In 1992, Land Rover finally introduced their own diesel engines in the Range Rover, beginning with the 111 bhp (83 kW) 200TDi, first released in the Land Rover Discovery and following in 1994, the 300 TDi, again with 111 bhp.