engines with 2.6 and 3.0–litres. These were both 12-valve engines, again from the Opel CIH family, but later 3.0-litre models were offered with 24-valves, producing much more power and torque. As well, Vauxhall used the "Dual-Ram" intake manifold, which lets the car breathe as two separate three-cylinder engines below 4,000 rpm, but changes the intake manifold profile at 4000 rpm to increase the runner length, thus increasing total engine output. In addition to the straight-6 engines there was a range of straight-4s. Starting with GMs popular 2-litre family 2 engine, the C20NE, with 115PS and 125lb.ft torque. There was also a 2.3 turbo diesel available with 100PS and 160lb.ft torque. Special Lotus version In 1990, Vauxhall launched a high performance Lotus Carlton in collaboration with Lotus Cars. (An Opel version was also produced as the Lotus Omega.) It was built with a 3615 cc six-cylinder twin-turbo engine (designated C36GET) capable of over , making it officially (for the time) the fastest full four-seater that had ever been made. It cost £48,000 – well over double the price of a standard Carlton. As a result, Vauxhall's original plans to sell about 1,000 in the UK ended in 440 UK cars being sold. For those with less money there was the 3000GSi 24v, with a top speed of . GSi 3000 & Diamond Prior to the Lotus tuned version, the range topper was the GSi 3000 upon which the Lotus Carlton was based. At launch in 1986 it had giving it a top speed of . In 1990, power was increased by going from two valves per cylinder to four, creating a 24-valve engine, resulting in which allowed 0-62 mph to be dispatched in 7.6 seconds and increased the top speed to . It was also available with an Automatic gearbox, which reduced the top speed to and increased the 0–62 mph time to 8.6 seconds. The Carlton Diamond 3.0 24v Estate was also made. Identical to the GSI but with an estate body shell, it sold in much more limited numbers (90) and so is a much rarer sight. Guinness World Record In June 1992 two teams from Horley Round Table, Surrey, UK, set a Guinness World Record time of 77 hours 34 minutes, driving a total 6,700 km across the then 12 EC countries in two Vauxhall Carlton 24V 3000 GSi's (J870 FFM and J751 DYC). The Carltons were provided