The McLaren MP4/6 was designed by Neil Oatley for the 1991 F1 season. It was the first McLaren to be powered by a Honda V12 engine. The car was tested by Gerhard Berger in the off-season, but he was unimpressed with the new engine, feeling it was underpowered for what it was, especially compared to Honda's V10 engine in the previous year's car. When Ayrton Senna returned for pre-season testing, he knuckled down to try to solve the engine's problems. McLaren's domination in the early part of the year was mainly due to the lack of reliability of the Williams FW14.

The MP4/6 raced throughout 1991 with a manual "H" pattern gearbox. A semi-automatic transmission was tested during the season, but was never regarded as good enough to be used in a race. Ferrari and Williams were the only teams using semi-automatic gearboxes during 1991. This makes the MP4/6 the last Formula One car to win a World Championship using a manual transmission.

For the early races of 1992, McLaren used the MP4/6 upgraded to MP4/6B spec.


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Type: RA121E

Year: 1991

Number of cylinders: 12

Configuration: 60° vee

Weight: 150 kg

Capacity: 3493

RPM: 15000

Power: 850-880 bhp

F1 McLaren MP4/6 MP4/6B Honda RA121E (1991/2)


F1 McLaren MP4/6 Honda RA121E (1991/2)

Honda build solo F1 project RC100

Honda RC-F1 1.5X (Honda RC101 / RC1B-101)

Honda went on to call the RC100 the "RC-F1 1.0X", the RC101 as the "RC-F1 1.5X", and the RC101B as the "RC-F1 2.0X".

Honda often called the chassis numbers: RC1-203/1, RC1B-101, and RC2-001.

These cars must not be confused with the Honda RA099, which was an official Honda prototype for the 1999 season, but never ran.

The Honda RC100 was a prototype Formula One car, built as an ‘unofficial  solo Honda project by engineers from Honda. The car was completed in 1993 and tested at Honda's Suzuka Circuit before being destroyed in a crash test. Two models, known as RC101 and RC101B, were also built and tested before the project ended.