Lotus 900 series

900 series
900 series
Overview
Manufacturer	Lotus Cars
Production	1972–1999
Layout
Configuration	Inline-4 (Types 904, 905, 906, 907, 910, 911, 912, 920); V8 (Types 909, 918);
Displacement	2.0 L (1,973 cc; 120.4 cu in); 2.0 L (1,991 cc; 121.5 cu in); 2.0 L (1,994 cc; 121.7 cu in); 2.2 L (2,174 cc; 132.7 cu in); 3.5 L (3,506 cc; 213.9 cu in); 4.0 L (4,011 cc; 244.8 cu in);
Cylinder bore	83 mm (3.27 in); 84.45 mm (3.325 in); 95.25 mm (3+3⁄4 in);
Piston stroke	69.24 mm (2.726 in); 69.85 mm (2+3⁄4 in); 70.3 mm (2.77 in); 76.2 mm (3 in); 81 mm (3.19 in); 89 mm (3+1⁄2 in);
Cylinder block material	Iron (Types 904, 905); Aluminium (all others);
Cylinder head material	Aluminium
Valvetrain	DOHC 4 valves x cylinder
Compression ratio	7.5:1, 8.0:1, 8.4:1, 9.4:1, 9.5:1, 10.9:1
Combustion
Turbocharger	Single/Twin Garrett AiResearch T3 (in Lotus Esprit)
Fuel system	Dell'Orto 40 DHLA carburettor EZenith-Stromberg carburettors; Tecalemit-Jackson mechanical fuel injection; Delco GMP4 Electronic FI;
Management	Lucas, Bosch KE-Jetronic
Fuel type	Petrol
Oil system	Dry sump; Wet sump (reverted in 1982);
Cooling system	Water-cooled
Output
Power output	140–350 hp (104–261 kW)
Torque output	140–295 lb⋅ft (190–400 N⋅m)
Dimensions
Dry weight	214–414.5 lb (97.1–188.0 kg)
Chronology
Predecessor	Lotus-Ford Twin Cam

The Lotus 900 series is a family of internal combustion engines designed and built by Lotus Cars of the United Kingdom. Successor to the Lotus-Ford Twin Cam, the 900 was the first complete engine developed by Lotus. Production ran from 1972 to 1999.