McLaren MP4/6
McLaren MP4/6B
The MP4/6s of Gerhard Berger (front) and Ayrton Senna (behind)
CategoryFormula One
ConstructorMcLaren International (chassis)
Honda Racing F1 (engine)
Designer(s)Neil Oatley (Executive Engineer)
Matthew Jeffreys (Head of Vehicle Design)
David North (Chief Transmission Engineer)
David Neilson (Chief Suspension Engineer)
Bob Bell (Head of R&D)
Mike Gascoyne (Head of Aerodynamics)
Osamu Goto (Engine Technical Director (Honda))
PredecessorMP4/5B
SuccessorMP4/7A
Technical specifications[1] [2]
ChassisCarbon fibre monocoque
EngineHonda RA121E, 3,497 cc (213.4 cu in), 60° V12 NA, mid-engine, longitudinally mounted
TransmissionWeismann/McLaren Transverse 6-speed manual
Power725 hp (540.6 kW) @ 13,500 rpm[3][4] (early season)
780 hp (581.6 kW) @ 14,800 rpm (late season)[5]
FuelShell
TyresGoodyear
Competition history
Notable entrantsHonda Marlboro McLaren
Notable drivers1. Brazil Ayrton Senna
2. Austria Gerhard Berger
Debut
First win1991 United States Grand Prix
Last win1991 Australian Grand Prix
Last event
RacesWinsPodiumsPolesF/Laps
18819105
Constructors' Championships1 (1991)
Drivers' Championships1 (Ayrton Senna)

The McLaren MP4/6 is a successful Formula One racing car designed by McLaren's Neil Oatley, Matthew Jeffreys, David North, David Neilson, Bob Bell and Mike Gascoyne; powered by the Honda RA121E V12 engine for use in the 1991 Formula One season, with the engine's design and development led by Osamu Goto. It was driven by reigning World Champion, Brazilian Ayrton Senna, and Austria's Gerhard Berger. Ayrton Senna would win his third World Championship in the MP4/6. The MP4/6 was notable for being the last F1 car to win the championship with a manual gearbox and the only F1 car powered by a V12 engine to do so.

Design and pre-season testing

The MP4/6 was the first McLaren to be powered by a Honda V12 engine, which Honda quote at 735 PS (725 bhp; 541 kW) at 13,500rpm.[3] The car was tested by Berger in the off-season, but he was unimpressed with the initial version of the new engine, feeling it was underpowered compared to the 690 bhp (515 kW; 700 PS) V10 engine used in the 1990 car, the MP4/5B. When Senna returned for pre-season testing he and Berger, along with Honda, 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 700 bhp (522 kW; 710 PS) Renault V10-powered Williams FW14.[6]

By the latter half of the season, Honda (at Senna's urging) had managed to improve the engine to 780 hp (581.6 kW) @ 14,800 rpm.

The MP4/6 raced throughout 1991 with a manual "H" pattern gearbox. A semi-automatic transmission was tested during the season (and shown at the Hungarian Grand Prix; the car equipped with it ran 4 laps on track in practice before Senna spun off; the car was then converted back to a manual[7]) but was never regarded as good enough to be used in a race; Ferrari and Williams were the only teams to use semi-automatic gearboxes during 1991. The MP4/6 would go down as the last Formula One car to win a World Championship using a manual transmission and the only F1 car to win the World Championship with a V12 engine.[8]

Season summary

Senna won the first four races of the season, in the United States, Brazil, San Marino and Monaco, before Williams and Nigel Mansell found their feet with the FW14, which dominated in mid-season. Consistent podium finishes on Senna's part throughout the year helped McLaren, but Senna insisted that Honda step up their engine development programme and demanded further improvements to the car before it was too late. Honda responded with updated versions of the V12 engine, while Oatley redesigned various features of the car, particularly the sidepods and wings. Senna won in Hungary and Belgium before clinching his third and final Drivers' Championship in Japan with second place behind Berger; he then won the final race in Australia to secure the team's fourth consecutive Constructors' Championship.[9]

McLaren continued with the MP4/6, upgraded to 'B' specification, for the first two races of 1992, Senna finishing third in South Africa. The car was then replaced with the official 1992 car, the MP4/7A, though three MP4/6Bs were brought to the 1992 Brazilian Grand Prix as spares.

The MP4/6 was considered by some to be the most competitive car in the Formula One field until Williams sorted the FW14, which was aerodynamically and technically more advanced. In all, the MP4/6 took eight Grand Prix wins and ten pole positions and scored 148 points. The car brought a close to McLaren's and Honda's domination of the sport, stretching back to the mid-1980s.

The McLaren MP4/6 is included as included as a classic car in Codemasters F1 2017, F1 2018, F1 2019 and F1 2020 video games.

Complete Formula One results

(key) (results in bold indicate pole position, results in italics indicate fastest lap)

Year Entrant Chassis Engine Tyres Drivers 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pts. WCC
1991 Honda Marlboro McLaren MP4/6 Honda RA121E
V12		 G USA BRA SMR MON CAN MEX FRA GBR GER HUN BEL ITA POR ESP JPN AUS 139 1st
Ayrton Senna 1 1 1 1 Ret 3 3 4 7 1 1 2 2 5 2 1
Gerhard Berger Ret 3 2 Ret Ret Ret Ret 2 4 4 2 4 Ret Ret 1 3
1992 Honda Marlboro McLaren MP4/6B Honda RA121E
V12		 G RSA MEX BRA ESP SMR MON CAN FRA GBR GER HUN BEL ITA POR JPN AUS 99* 2nd
Ayrton Senna 3 Ret
Gerhard Berger 5 4

* Only 9 points scored with the MP4/6B. Remaining points scored with MP4/7A.

References

  1. ↑ "STATS F1 • McLaren MP4/6". Statsf1.com. Retrieved 23 August 2010.
  2. ↑ "MP4/6 on Honda website (Japanese)". Retrieved 22 February 2019.
  3. 1 2 Honda Collection Hall 収蔵車両走行ビデオ McLaren Honda MP4/6（1991）, archived from the original on 14 December 2021, retrieved 16 June 2020
  4. ↑ "McLaren Racing - History of the F1 engine".
  5. ↑ "Balance of power".
  6. ↑ "Gerhard Berger: Suzuka 1991: McLaren MP4/6 Honda V12…". 11 July 2014. Retrieved 10 December 2019.
  7. ↑ ESPN Speedworld: 1991 Hungarian Grand Prix
  8. ↑ "1991 McLaren MP4/6 Honda - Images, Specifications and Information". Ultimatecarpage.com. Retrieved 10 December 2019.
  9. ↑ "McLaren Racing - Heritage - MP4/6". www.mclaren.com. Retrieved 10 December 2019.
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