The DB 605 used dual Bosch magnetos with two sets of spark plugs, fuel injection was used on the Daimler-Benz DB 605 which had the advantage of not running lean and loosing power when in a negative "G" situation as found in many dog-fight situations. Rolls Royce opted for carburettors on the basis that the cooling effect of petrol vaporising in a carburettor caused a denser mixture and therefore greater volumetric efficiency, and hence greater power. Many of today's turbo charged or supercharged engines use an intercooler for this reason. Late variants of the DB 605 engine utilised methanol-water injection or nitrous oxide injection to increase take-off and emergency combat power.
Daimler-Benz DB 605 Specifications:
- Type: Liquid-cooled inverted 60° V12 supercharged piston engine with four valves per cylinder, the two exhaust valves were sodium-cooled with all valves operated by a single camshaft per cylinder bank.
- Bore: 154 mm (6.06 in)
- Stroke: 160 mm (6.30 in)
- Displacement: 35.7 L (2,176 in³)
- Length: 2,158 mm (85 in)
- Width: 760 mm (30 in)
- Height: 1,037 mm (41 in)
- Dry weight: 756 kg (1,667 lb)
- Supercharger: Single-stage variable-speed centrifugal type supercharger driven through a barometrically controlled hydrodynamic fluid couplings; methanol/water injection via the supercharger intake.
- Fuel system: Bosch direct fuel injection
- Oil system: Dry sump with one pressure pump and twin scavenge pumps
- Cooling system: Liquid-cooled, pressurized
- Reduction gear: 0.594:1
Daimler-Benz DB 605 Power output:1,324 kW (1,800 PS/1,775 hp) at 2,800 rpm for takeoff with water-methanol injection1,250 kW (1,700 PS/1,677 hp) at 2,800 rpm at 4,000 m (13,120 ft) for maximum power with methanol-water injection794 kW (1,080 PS/1,065 hp) at 2,300 rpm at 5,500 m (18,000 ft) for continuous useSpecific power: 35.0 kW/L (0.77 hp/in³)Compression ratio: 7.5/7.3:1 with 87-octane fuel; 8.5/8.3:1 with 100-octane fuel