CH-Type engine
Overview
Manufacturer	Renault-Gordini
Layout
Configuration	90° V6
Displacement	2.0 L (1,997 cc) 2.1 L (2,138 cc)
Cylinder bore	86 mm (3.39 in) 89 mm (3.5 in)
Piston stroke	57.3 mm (2.26 in)
Valvetrain	DOHC 4 valves x cyl.
Combustion
Turbocharger	On CHS & CHS 2
Fuel type	Petrol
Cooling system	Water-cooled
Output
Power output	285–540 bhp (213–403 kW; 289–547 PS)
Torque output	150–300 lb⋅ft (203–407 N⋅m)
Chronology
Successor	EF series

The CH-Type was a 90° V6 engine developed by Renault-Gordini for Renault's autosport activities. This François Castaing design was the predecessor of the famous EF series.

In 1972, after an agreement was reached with Elf, François Castaing, technical director of Renault Gordini, was given the go-ahead to build a 2-litre engine that could be used in a "sports" model and then in Formula 2. His team opted for a 90° V6, which was released in 1973 and was named the "type CH1" in honour of Claude Haardt, who had died in an accident a few months earlier.

Engines

CH1

1973-1977

• CH1 (N/A): 2.0 L (1,997 cc) Bore x stroke 86 mm × 57.3 mm (3.39 in × 2.26 in)

285 bhp (213 kW; 289 PS) @ 9,800 rpm (1973), 300 bhp (224 kW; 304 PS) @ 10,500 rpm (1977)

This V6 engine with four overhead camshafts and four valves per cylinder would prove highly successful. Its record reads as follows:

• European 2-litre Sports-Prototype Champion 1974, winning all seven races and the top three spots in the championship standings with the Alpine A441.
• European Formula 2 Champion 1976 with Elf 2, which notched up four race wins, four pole positions and six podium finishes in 12 races.
• European Formula 2 Champion 1977 with Martini MK 22, which amassed five race wins, two pole positions and six podium finishes in 13 races.
• A total of 14 race wins and eight podium finishes in 23 races in three seasons of 2-litre sportsprototype racing (1973-75) with the Alpine A 440 and A 441.
• A total of 14 race wins, 10 pole positions and 20 podium finishes in 25 Formula 2 races in the 1976 and 1977 seasons, with the Elf 2 and Martini MK 19 and MK 22.

CHS

1975-1978

• CHS (Turbo): 2.0 L (1,997 cc) Bore x stroke 86 mm × 57.3 mm (3.39 in × 2.26 in)

500 bhp (373 kW; 507 PS) @ 9,500 rpm (1975-1978)

Used for the 1975 and 1976 World Championship for Makes and the 1977 and 1978 Le Mans 24 Hours, this engine fully accomplished its second goal, with:

• One victory and five podium finishes in the 1975 and 1976 championships with the Alpine A441T and A442.
• Second place in the 1977 Le Mans 24 Hours with a Mirage GR8.
• Victory in the 1978 Le Mans 24 Hours with the Alpine A442 B.

CHS 2

1975-1978

• CHS 2 (Turbo): 2.1 L (2,138 cc) Bore x stroke 89 mm × 57.3 mm (3.50 in × 2.26 in)

520 bhp (388 kW; 527 PS)/540 bhp (403 kW; 547 PS) @ 9,500 rpm (1978)

Taking full advantage of engine capacity regulations by extending the bore to 89 mm (3.5 in) while maintaining the same stroke of 57.3 mm (2.26 in), this engine enabled the only Alpine A443 entered at Le Mans in 1978 to tire out the Porsches and help the Alpine A442 B to victory.