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Sectional view of the Daimler Benz DB 601N.

The DB 605 was a development of the DB 601 and was very similar in basic construction to that power unit. The main improvements increased the maximum permissible r.p.m..

Altered valve timing increased the inlet period and improved the scavenging to give greater volumetric efficiency at higher r.p.m.

A complete redesign of the cylinder block obtained the maximum possible bore with existing cylinder centers. The new design also repositioned the spark plugs. The crankshaft big-end bearings were also modified.

CONSTRUCTION: Cylinder barrels of steel are screwed and shrunk into the cast Silium-Gamma-alloy cylinder blocks. These dry liners project beyond block providing attachment by means of threaded rings which pull the liners against the finished face of the crankcase.

Two inlet and two exhaust valves per cylinder operated by rocker arms directly from a single camshaft carried upon the head. Stellited valve seats, exhaust valve sodium cooled, ball joints interpose rockers and valve stems.

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A DB 605 Engine at the RAF Museum in London.

Forged light-alloy pistons have concave heads, each piston has a floating pin and three compression and two oil-scraper rings with one below the pin.

Forked type connecting rods with serrated joints at big ends, roller bearing at big end has three tracks of 24 rollers each. Forked rod is keyed to outside of roller race, plain rod runs on lead-bronze bearing over race.

One piece forged steel crankshaft carried in seven plain lead-bronze bearings. Eight balance weights attached to crank webs, splined forward end to receive splined sleeve of reduction gear pinion.

Deep light alloy crankcase with webs at main bearings, tubular mounting at rear below crankshaft for installation of cannon which can fire through propeller shaft, light top cover.

Centrifugal supercharger on port side of engine driven through a fluid coupling by a shaft at right angles to crankshaft. This shaft is driven through bevel gears from the crankshaft, variation in propeller speed secured through variable filling of fluid coupling by two-stage engine driven pump receiving lubricating oil from the main pressure filter.

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Daimler-Benz DB 605A

First stage delivers oil direct to coupling and second stage delivery is passed in varying proportions between crankcase and coupling by piston valve controlled by a capsule which is sensitive to inlet pressure. Second stage cuts in at approximately 5,000 ft. and full delivery occurs at approximately 11,500 ft.

Butterfly throttle which is capsule controlled regulates supercharger delivery, second throttle which is pilot operated controls air supply to engine and manifold pressure, first throttle subjected to pressure between two throttles, increased boost for take-off controlled by clockwork mechanism, mixture delivered by supercharger to looped manifold by large diameter pipe, dry-sump pressure-feed lubrication, gear type oil pumps, spray of oil directed upon reduction gears, main oil pressure line feeds crankshaft bearings, secondary line feeds supercharger fluid pump.

Scavenging pumps at rear end of camshafts, single spur type propeller reduction gears, provision for mounting controllable-pitch full-feathering propeller, centrifugal pump circulates coolant consisting of equal parts water and ethylene-glycol.

Specifications:
Daimler-Benz DB 605
Date:	1937 (DB 600 series)
Cylinders:	12
Configuration:	Inverted V, Liquid cooled
Horsepower:	1,475 (1,099 kw)
R.P.M.:	2,800
Bore and Stroke:	6.1 in. (154 mm) x 6.3 in. (160 mm)
Displacement:	2,179 cu. in. (35.7 liters)
Weight:	1,663 lbs. (756 kg)

Courtesy of
 The Aviation History On-Line Museum. 

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Daimler-Benz DB 605

The Daimler-Benz DB 605 was a German aircraft engine, built during World War II . Developed from the DB 601 the DB 605 was used from 1942 to 1945 in Messerschmitt Bf 109 and Bf 110 fighters and in some other aircraft. License-built versions of the DB 605 were used in the MC.205 Veltro, G.55 Centauro and some other Italian aircraft.

The primary difference between the 605 and 601 was the displacement. Through careful study, the engineers were able to determine that the existing block could be bored out to a larger diameter without seriously affecting the strength of the engine block. The difference was minimal, increasing from the 601's 150 mm to the 605's 154 mm, but given the 12 cylinders this increased the overall displacement from 33.9 liters to 35.7. Altered valve timing increased the inlet period and improved the scavenging to give greater volumetric efficiency at higher speeds, which improved the maximum allowable RPM to 2800 from the 601's 2600. The combination of these changes improved power from 1,350 PS (1,332 hp) to 1,475 PS (1455 hp). The engine was otherwise similar, notably in size which was identical to the 601. However, weights did increase from 700 to 756 kg.

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In other ways the engine was essentially identical to the 601. Both used dual Bosch magnetos firing twin spark plugs for ignition. Fuel injection was powered by a pump supplying up to 90 bar, and the oil system used three pumps with a separate 35 liter oil tank. The supercharger was fairly advanced for the era, it used a barometrically controlled hydraulic clutch (fluid coupling) which allowed the system to automatically compensate for changes in altitude.

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Like the 601, the 605 was designed to run on "B4" fuel, at 87 octane. In 1944 a series of newer engines was introduced, allowing the engine to run on the 100 octane "C3" fuel and optionally including fittings for various optional power-boosting agents, MW50 and GM-1. The DB 605AM running initially on C3 and MW-50 improved performance to 1,800 PS (1775 hp) for takeoff, in mid 1944 the requirement for C3 was dropped and B4 + MW-50 was used. The DB 605AS(M) improved the maximum rated altitude by using a larger supercharger taken from the db 603 but was otherwise similar to the A(M). The DB 605ASB improved takeoff performance to 1,800 PS (1,775 hp), while maintaining the high-altitude performance of the ASM. The final version of the A-series was the DB 605ASC of 1945, further improving takeoff performance to 2,000 PS (1,973 hp).

Daimler had also be working on an upgraded D-series as early as 1942, capable of running on either C2 or C3 fuel. These engines did not see service until 1944, and were quickly followed by the 1,800 PS (1,775 hp) DB 605DB (running on B4 + MW-50 or C-3 without MW-50) and 2,000 PS (1,973 hp) DB 605DC. These engines saw use on the late-war Bf 109 G-10 and Bf 109 K-4.

 

Production Versions

 

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• DB 605 A(M) Standard fighter engine, up to 1475 PS, 605 AM with MW-50 system up to 1800 PS

  • DB 605 B Same as 605 A but for use in twin-engined aircraft like Me 110, Me 210 (different prop/gear ratio)

• DB 605 AS(M) Altitude optimized version of 605 A using the larger DB 603 supercharger, up to 1435 PS, ASM with MW-50 system and up to 1800 PS

  • DB 605 ASB(M) Altitude optimized late-war version of 605 AS using B4 fuel, ASBM with MW-50 system and up to 1800 PS

  • DB 605 ASC(M) Altitude optimized late-war version of 605 AS using C3 fuel, ASCM with MW-50 system and up to 2000 PS

• DB 605 DM First DB 605 D version, standard MW-50 equipment, up to 1700 PS

  • DB 605 DBM Improved 605 DM, standard MW-50 equipment, first version up to 1850 PS, later reduced to 1800 PS, B4 fuel

  • DB 605 DCM Improved 605 DM, standard MW-50 equipment, up to 2000 PS, C3 fuel

• DB 610 Two DB 605 coupled to work on a single propeller shaft for use in Heinkel He 177

 

Prototype / Pre-Production

 

• DB 605 BS proposed version for twin-engine aircraft, derived from DB 605 AS

• DB 605 E proposed version for twin-engine aircraft, derived from DB 605 D

• DB 605 L Similar to 605 D but with two-stage supercharger, 2000+ PS

Note: All power ratings in PS (metric horsepower). Unless otherwise noted takeoff/emergency power at sea level.

 

 

Engine Specifications (DB 605AM)

General characteristics

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• Type: 12-cylinder liquid-cooled supercharged 60° inverted Vee aircraft piston engine

• Bore: 154 mm (6.06 in)

• Stroke: 160 mm (6.30 in)

• Displacement: 35.7 L (2,180 in³)

• Length: 2,303 mm (90.67 in)

• Diameter: 845 mm (33.27 in)

• Dry weight: 730 kg (1,642 lb)

Components

• Valvetrain: Two intake and two sodium-cooled exhaust valves per cylinder actuated via a single overhead camshaft per cylinder block.

• Supercharger: Single-stage variable-speed centrifugal type supercharger driven through a barometrically controlled clutch; mw50 injection into the supercharger intake.

• Fuel system: Direct fuel injection

• Oil system: Dry sump with one pressure and two scavenge pumps

• Cooling system: Liquid-cooled, pressurized

Performance

• Power output:
   

  • 1,324 kW (1,800 PS - 1,775 hp) at 2,800 rpm for takeoff with MW-50 injection

  • 1,250 kW (1,700 PS - 1,677 hp) at 2,800 rpm at 4,000 m (13,120 ft) for maximum power with MW-50 injection

  • 794 kW (1,080 PS - 1,065 hp) at 2,300 rpm at 5,500 m (18,000 ft) for max continuous

• Specific 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

• Power-to-weight ratio: 1.68 kW/kg (1.02 hp/lb)

Specifications:
Daimler-Benz DB 600 Series
Model:	DB 600	DB 601	DB 603	DB 605	DB 610
Cylinders:	12	12	12	12	24
Configuration:	Inverted V, Liquid cooled	Inverted V, Liquid cooled	Inverted V, Liquid cooled	Inverted V, Liquid cooled	Inverted W, Liquid cooled
Horsepower:	1,000 hp (1,000 kw)	1,360 hp (1,000 kw)	2,830 hp (0,000 kw)	1,475 hp (1,099 kw)	2,450 hp (0,000 kw)
RPM:	2,400	2,600	2,830	2,800	2,800
Bore and Stroke:	5.9 in. (150 mm) x 6.3 in. (160 mm)	5.9 in. (150 mm) x 6.3 in. (160 mm)	6.4 in. (162 mm) x 7.1 in. (180 mm)	6.1 in. (154 mm) x 6.3 in. (160 mm)	6.1 in. (154 mm) x 6.3 in. (160 mm)
Displacement:	2,069 cu. in. (33.9 liters)	2,069 cu. in. (33.9 liters)	2,715 cu. in. (44.5 liters)	2,179 cu. in. (35.7 liters)	5,438 cu. in. (71.4 liters)
Weight:	1,510 lbs. (686 kg)	1,540 lbs. (700 kg)	2,002 lbs. (910 kg)	1,663 lbs. (756 kg)	3,476 lbs. (1,580 kg)

 

 

Daimler-Benz DB 601

 

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Daimler-Benz DB 601

The Diamler-Benz DB 601 was a German aircraft engine built during World War II.. It was a liquid-cooled inverted V12, and powered the Messerschmitt Bf 109, among others. The DB 601 was basically an improved DB 600 with direct fuel injection.

The DB 601Aa was license-built in Japan by Aichi as the Atsuta and Kawasaki as Ha-60 to be used in the Ki-61 Hien and in Italy by Alfa-Romeo as R.A.1000 R.C.41-I Monsone for use in the C.202 Folgore.