BRM V12 engine

BRM V12 engine[1][2][3]
Overview
ManufacturerBRM
Production1967–1977
Layout
Configuration60° V-12
Displacement3.0 L (183 cu in)
Cylinder bore74.6 mm (2.9 in)
Piston stroke57.2 mm (2.3 in)
Cylinder block materialAluminum[4]
Cylinder head materialAluminum
Valvetrain48-valve, DOHC, four-valves per cylinder
Compression ratio11.0:1-11.5:1
Combustion
Fuel systemLucas fuel injection
Fuel typeGasoline
Oil systemDry sump
Output
Power output350–490 hp (261–365 kW)
Torque output250 lb⋅ft (339 N⋅m)
Dimensions
Dry weight136–190 kg (299.8–418.9 lb)[5]

The BRM V12 engine is a V12 Formula One racing engine, designed, developed and built by British manufacturer and constructor BRM, between 1967 and 1977.[6]

Background

[edit]
Pedro Rodríguez with BRM 1968

The H16 was replaced by a V12 (2.9375 x 2.25 in, 74.61 x 57.15 mm) designed by Geoff Johnson. It had been intended for sports car use, but was first used in F1 by the McLaren M5A.[7] Back at the works, the early V12 years were lean ones. In 1967 the two-valve layout gave about 360 bhp (270 kW) at 9,000 rpm. In 1968 this had increased to 390 bhp (290 kW) at 9,750 rpm. Geoff Johnson updated the design by adding a four-valve head, based on the H16 485 bhp 4-valve layout; this improved the V12's power output to 452 bhp (337 kW) at 10,500 rpm and eventually to a claimed 465 bhp (347 kW) during 1969. In 1973, Louis Stanley claimed 490 bhp (370 kW) at 11,750 rpm. The design and building of the first V-12 chassis, the P126 was contracted to former Lotus and Eagle designer Len Terry's Transatlantic Automotive Consultants. The cars first appeared during the 1968 Tasman Championship, powered by 2.5 litre versions of the engine, temporary team driver Bruce McLaren winning the fourth round of the series at Teretonga but being generally unimpressed with the car. BRM themselves built further examples of the Terry design, which were designated P133 and 1968 team drivers Mike Spence and Pedro Rodríguez appeared competitive in early season non championship races at Brands Hatch and Silverstone, but then Spence was killed driving the Lotus 56 turbine during qualifying at Indianapolis. Spence's replacement, Richard Attwood, finished a good second to Graham Hill's Lotus at Monaco, but after this results went downhill and the season petered out ignominiously. For 1969 the four valve per cylinder engine was developed and a new slimline car, the P139 was built. John Surtees joined as the team's lead driver backed up by Jack Oliver. Rodríguez was shunted into the semi-works Parnell team. Surtees' time at BRM was not a happy one and, despite the fact that a ground effect "wing car" was designed, this was never constructed and the team's performances were lacklustre. Surtees left after a single season (1969), along with Tony Rudd who went to Lotus (initially on the road-car side), and Geoff Johnson who departed for Austin Morris.

The team regrouped with Tony Southgate as designer and Rodríguez brought back into the fold to partner Oliver, and gained its first V12 victory when Rodríguez won the 1970 Belgian Grand Prix in a P153, with further victories for Jo Siffert and Peter Gethin in 1971 in the P160. The team had reached one of its intermittent peaks of success. Both Siffert and Rodríguez were killed before the 1972 season and the team had to regroup completely again. Their last World Championship victory came when Jean-Pierre Beltoise drove a stunning race to win the rain-affected 1972 Monaco Grand Prix with the P160. He also won the non-championship 1972 World Championship Victory Race later in the year. The 1972 campaign was generally chaotic: having acquired major sponsorship, Louis Stanley originally planned to field up to six cars (three for established drivers, three for paying journeymen and young drivers) of varying designs including P153s, P160s and P180s and actually ran up to five for a mix of paying and paid drivers until it became obvious that it was completely overstretched and the team's sponsors insisted that the team should cut back to a more reasonable level and only three cars were run in 1973 for Beltoise, Lauda, and Regazzoni.

Formula One World Championship results

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

Year Entrant Chassis Engine(s) Tyres Drivers 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 WDC Points
1967 Bruce McLaren Motor Racing McLaren M5A BRM P101 3.0 V12 G RSA MON NED BEL FRA GBR GER CAN ITA USA MEX 10th 3
New Zealand Bruce McLaren 7 Ret Ret Ret
1968 Owen Racing Organisation BRM P126
BRM P133
BRM P138
BRM P101 3.0 V12
BRM P142 3.0 V12
G RSA ESP MON BEL NED FRA GBR GER ITA CAN USA MEX 28 5th
Mexico Pedro Rodríguez Ret Ret Ret 2 3 NCF Ret 6 Ret 3 Ret 4
United Kingdom Richard Attwood 2F Ret 7 7 Ret 14
United States Bobby Unser DNS Ret
Reg Parnell Racing BRM P126 BRM P101 3.0 V12 G United Kingdom Piers Courage Ret Ret Ret Ret 6 8 8 4 Ret Ret Ret
Cooper Car Company Cooper T86B BRM P101 3.0 V12 F Italy Ludovico Scarfiotti 4 4 14 7th
United Kingdom Brian Redman 3 Ret
United Kingdom Vic Elford 4 Ret Ret Ret 5 Ret 8
France Johnny Servoz-Gavin Ret
United Kingdom Robin Widdows Ret DNA
Belgium Lucien Bianchi 3 6 Ret Ret NC NC Ret
Bruce McLaren Motor Racing McLaren M5A BRM P101 3.0 V12 G New Zealand Denny Hulme 5 10th 3
Joakim Bonnier Racing Team McLaren M5A BRM P101 3.0 V12 G Sweden Joakim Bonnier DNQ Ret 8 Ret 6 Ret NC PO
1969 Owen Racing Organisation BRM P138
BRM P133
BRM P139
BRM P101 3.0 V12
BRM P142 3.0 V12
D RSA ESP MON NED FRA GBR GER ITA CAN USA MEX 7 6th
United Kingdom Jackie Oliver 7 Ret Ret Ret Ret Ret Ret Ret Ret 6
United Kingdom John Surtees Ret 5 Ret 9 Ret DNS NC Ret 3 Ret
Canada Bill Brack NC
Canada George Eaton Ret Ret
Reg Parnell Racing P126 BRM P101 3.0 V12 G Mexico Pedro Rodríguez Ret Ret Ret
1970 Owen Racing Organisation
Yardley Team BRM
BRM P153
BRM P139
BRM P142 3.0 V12 D RSA ESP MON BEL NED FRA GBR GER AUT ITA CAN USA MEX 23 7th
Mexico Pedro Rodríguez 9 Ret 6 1 10 Ret Ret Ret 4 Ret 4 2 6
United Kingdom Jackie Oliver Ret Ret Ret Ret Ret Ret Ret Ret 5 Ret NC Ret 7
Canada George Eaton Ret DNQ DNQ Ret 12 Ret 11 Ret 10 Ret
United Kingdom Peter Westbury DNQ
1971 Yardley Team BRM BRM P153
BRM P160
BRM P142 3.0 V12 F RSA ESP MON NED FRA GBR GER AUT ITA CAN USA 36 2nd
Switzerland Jo Siffert Ret Ret Ret 6 4 9 DSQ 1PF 9 9 2
New Zealand Howden Ganley Ret 10 DNQ 7 10 8 Ret Ret 5 DNS 4
Mexico Pedro Rodríguez Ret 4 9 2 Ret
United Kingdom Vic Elford 11
United Kingdom Peter Gethin 10 1 14 9
Austria Helmut Marko 11 Ret 12 13
Canada John Cannon 14
1972 Marlboro BRM BRM P160B
BRM P153
BRM P180
BRM P160C
BRM P142 3.0 V12 F ARG RSA ESP MON BEL FRA GBR GER AUT ITA CAN USA 14 7th
Sweden Reine Wisell Ret Ret Ret Ret Ret 12
New Zealand Howden Ganley 9 NC Ret Ret 8 DNS 4 6 11 10 Ret
Austria Helmut Marko 10 14 8 10 Ret
United Kingdom Peter Gethin Ret NC Ret Ret Ret DNS Ret 13 6 Ret Ret
Spain Àlex Soler-Roig Ret Ret
France Jean-Pierre Beltoise Ret Ret 1F Ret 15 11 9 8 8 Ret Ret
Australia Vern Schuppan DNS
United Kingdom Jackie Oliver Ret
Canada Bill Brack Ret
United Kingdom Brian Redman Ret
1973 Marlboro BRM BRM P160C
BRM P160D
BRM P142 3.0 V12 F ARG BRA RSA ESP BEL MON SWE FRA GBR NED GER AUT ITA CAN USA 12 7th
Switzerland Clay Regazzoni 7P 6 Ret 9 10 Ret 9 12 7 8 Ret 6 Ret 8
Austria Niki Lauda Ret 8 Ret Ret 5 Ret 13 9 12 Ret Ret DNS Ret Ret Ret
France Jean-Pierre Beltoise Ret Ret Ret 5 Ret Ret Ret 11 Ret 5 Ret 5 13 4 9
United Kingdom Peter Gethin Ret
1974 Team BRM BRM P160E
BRM P201
BRM P142 3.0 V12 F ARG BRA RSA ESP BEL MON SWE NED FRA GBR GER AUT ITA CAN USA 10 7th
France Jean-Pierre Beltoise 5 10 2 Ret 5 Ret Ret Ret 10 12 Ret Ret Ret NC DNQ
France François Migault Ret 16 15 Ret 16 Ret Ret 14 NC DNQ Ret
France Henri Pescarolo 9 14 18 12 Ret Ret Ret Ret Ret Ret 10 Ret
New Zealand Chris Amon NC 9
1975 Stanley-BRM BRM P201 BRM P200 3.0 V12 G ARG BRA RSA ESP MON BEL SWE NED FRA GBR GER AUT ITA USA 0 -'
United Kingdom Mike Wilds Ret Ret
United Kingdom Bob Evans 15 Ret DNQ 9 13 Ret 17 Ret Ret
1976 Stanley-BRM BRM P201B BRM P200 3.0 V12 G BRA RSA USW ESP BEL MON SWE NED FRA GBR GER AUT ITA CAN USA JPN 0 -'
United Kingdom Ian Ashley Ret
1977 Rotary Watches Stanley-BRM
Stanley-BRM
BRM P207
BRM P201B
BRM P202 3.0 V12
BRM P200 3.0 V12
G ARG BRA RSA USW ESP MON BEL SWE FRA GBR GER AUT NED ITA USA CAN JPN 0 -'
Australia Larry Perkins Ret 15
Sweden Conny Andersson DNQ DNQ DNQ DNQ
United Kingdom Guy Edwards DNPQ
Belgium Teddy Pilette DNQ DNQ DNQ

References

[edit]
  1. ^ "Engine BRM • STATS F1". www.statsf1.com.
  2. ^ "1974 - 1975 BRM P201 Specifications". Ultimatecarpage.com.
  3. ^ "1977 BRM P207 Specifications". Ultimatecarpage.com.
  4. ^ "1968 - 1969 BRM P126 Specifications". Ultimatecarpage.com.
  5. ^ "1972 BRM P180 Specifications". Ultimatecarpage.com.
  6. ^ "BRM P101 V12 – primotipo…". primotipo...
  7. ^ "The Cars". British Racing Motors.