BRM 4-cylinder engine

The BRM 4-cylinder engines are a series of four-stroke, naturally-aspirated, 2.5 L (150 cu in), inline-four Formula One racing engines, designed, developed and built by British Racing Motors, between 1956 and 1960. They were exclusively used by BRM; and powered the BRM team cars. It was constructed to conform the FIA engine requirements; necessitating a 2.5 L naturally-aspirated engine displacement formula. The power output for these motors were between 260–285 hp (194–213 kW), and 205 lb⋅ft (278 N⋅m).

BRM 255 BRM 258 BRM 259
Overview
Manufacturer	British Racing Motors
Production	1956–1960
Layout
Configuration	L4
Displacement	2.5 L (153 cu in)
Cylinder bore	4.05 in (103 mm)
Piston stroke	2.95 in (75 mm)
Valvetrain	8-valve, DOHC, two-valves per cylinder
Combustion
Fuel system	Carburetor
Fuel type	Gasoline
Oil system	Dry sump
Output
Power output	260–285 hp (194–213 kW)
Torque output	205 lb⋅ft (278 N⋅m)

Applications

• BRM P25
• BRM P48

Formula One Championship results

Year	Entrant	Chassis	Engine	Tyres	Drivers	1	2	3	4	5	6	7	8	9	10	11	Points	WCC
1956	Owen Racing Organisation	BRM P25	BRM P25 2.5 L4	D		ARG	MON	500	BEL	FRA	GBR	GER	ITA				n/a	n/a
					Mike Hawthorn		DNS				Ret
					Tony Brooks		DNS				Ret
					Ron Flockhart						Ret
1957	Owen Racing Organisation	BRM P25	BRM P25 2.5 L4	D		ARG	MON	500	FRA	GBR	GER	PES	ITA				n/a*	n/a*
					Ron Flockhart		Ret		Ret
					Roy Salvadori		DNQ
					Herbert MacKay-Fraser				Ret
					Jack Fairman					Ret
					Les Leston					Ret
1958	Owen Racing Organisation	BRM P25	BRM P25 2.5 L4	D		ARG	MON	NED	500	BEL	FRA	GBR	GER	POR	ITA	MOR	18	4th
					Harry Schell		5	2		5	Ret	5	Ret	6	Ret	Ret
					Jean Behra		Ret	3		Ret	Ret	Ret	Ret	4	Ret	Ret
					Maurice Trintignant						Ret
					Joakim Bonnier										Ret	4
					Ron Flockhart											Ret
1959	Owen Racing Organisation	BRM P25	BRM P25 2.5 L4	D		MON	500	NED	FRA	GBR	GER	POR	ITA	USA			18	3rd
					Harry Schell	Ret		Ret	7	4	7	5	7
					Ron Flockhart	Ret			6	Ret		7	13
					Joakim Bonnier	Ret		1	Ret	Ret	5	Ret	8
	British Racing Partnership	BRM P25			Stirling Moss				DSQ	2
					Hans Herrmann						Ret
1960	Owen Racing Organisation	BRM P25 BRM P48	BRM P25 2.5 L4	D		ARG	MON	500	NED	BEL	FRA	GBR	POR	ITA	USA		8	4th
					Graham Hill	Ret	7		3	Ret	Ret	Ret	Ret		Ret
					Joakim Bonnier	7	5		Ret	Ret	Ret	Ret	Ret		5
					Dan Gurney		NC		Ret	Ret	Ret	10	Ret		Ret