M4B - 1967

The M4B was the production variant of the Formula 2 design using the Lotus-Ford twincam engines and Hewland HD transaxles for the American Formula B racing. Another so-called M4B, the subject of this specification, was the interim 1967 Formula 1 car raced by Bruce McLaren. This was a stop gap measure between the demise of the M2B and the appearance of the new BRM-powered M5. The car was also fitted with side sponson to provide extra tankage.  Trojan built 25 M4A/B cars in 1967-1968.

Chassis: Bathtub monocoque formed from aluminium panelling bonded and riveted to four mild steel bulkheads

Suspension: Single top link with radius arms and lower wishbones, outboard coil spring/shock units and anti-roll bar in front. Twin radius arms, reversed lower wishbones and single top links with outboard coil spring/shock units at rear. McLaren-Elva cast magnesium wheels, 13 x 7 front, 13 x 10 rear (5.00 and 6.25 - 13 tyres)

Brakes: Girling or Lockheed 10½ inch discs all around with AR calipers

Body: Formed by monocoque sides plus fibreglass nose cone and cockpit surround

Engine: 2.1-litre BRM V8 with Hewland FT200 transaxle

Dimensions: Wheelbase 93 inches, front track 54 inches, rear track 54 inches, overall length 121 inches , height 30 inches, weight (with ballast) about 1120 pounds to comply with F1 limit.