P25

Chassis

Steel space frame. Aluminium and Magnesium body

Engine

BRM straight 4 cylinder

Specification

2.5-litre : 2 valves / cylinder, Naturally aspirated, Weber carburettors

Output

275 bhp

Weight

690 kg

Years Raced

1955-60

No: Built

11

Designer

Len Terry

Notes

The biggest contrast to the high reving V16 of the previous BRM was the twin-cam 2.5 litre four cylinder. Originally developed as a fuel injected engine, vibration gave it problems so it was fitted with twin Weber Carburettors. The engine was installed in a straightforward steel ladder-frame chassis with wishbone and coil spring suspension at the front and a DeDion axle at the rear. The four speed transaxle incorporated a single disc brake used to slow both rear wheels down. This system became known as the bacon slicer.

September 1955

P25/1 made the type's debut at the Oulton Park Gold Cup driven by Peter Collins.

July 1957

P25/3 scored the type's first victory in the non-championship Caen Grand Prix in France driven by Jean Behra, this was also BRMs first continental victory.

May 1959

P25/8 driven by Jo Bonnier finally won that elusive first Grand Prix for BRM at the Dutch Grand Prix, Zandvoort.

April 1960

P25/8 driven by Jo Bonnier made the last works appearance of a P25 at Goodwood.