Lister 5/1 Diesel

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Aviation engines Page 5 - Diesels

Rolls-Royce also had their fingers in the pie, and converted a Condor petrol (gasoline) engine to diesel operation in the early 1930's, and this engine had passed it's 50 hour type test towards the end of 1932, with flight trials later in the year in a Hawker Horsley aircraft. The engine had 12 cylinders of 5½" X 7½" giving a swept volume of 34729 cc or 2138 cu ins. The engine produced 480 hp at 1900 rpm, with a maximum rated speed of 2000 rpm. Two Bosch pumps and also their injectors provided the fuel system, but this was to vanish as WW2 broke out, leaving many UK engine companies with supply problems.

Rolls-Royce Condor Diesel Aero Engine

Rolls-Royce Condor Diesel Aero Engine

The Condor diesel (it was not allocated a name by Rolls-Royce) had the following dimensions: 74¼" length, 30½" width and 45½ height. Overall weight with accessories etc was 1504 lbs.

Rolls-Royce Condor Diesel Aero Engine

Rolls-Royce Condor Diesel Aero Engine

Hispano-Suiza and Clerget got together to produce engines, and it is thought likely that E.Clerget did not produce many of his own designs, the radial diesels were known later as the Clerget-Hispano engine: as unwieldy a title as you could think of. Eventually a 14-cylinder radial diesel was produced, as per the 9 cylinder, but with bores opened up to 140mm from 130mm and the same stroke of 170mm. This revised radial diesel developed 500 hp at 1900 rpm, with a dry weight of 1122 lbs. A maximum rating of 640 hp at 2200 was available from the same engine.

Clerget Radial Diesel Aero Engine

Clerget Radial Diesel Aero Engine

Clerget Radial Diesel Aero Engine

Clerget Radial Diesel Aero Engine

Alfa-Romeo were involved in many engine-related projects at this time, and they were then an independent company, with fairly sophisticated facilities. The company produced nice 6 cyl and V12 engines, unusually of two-stroke operation with vertical exhaust valves in the heads, and inlet through ports in the cylinder walls, fed by a scavenge blower driven off the front of the crankshaft. The engines shared many common components to keep production costs down, with cylinders of 95mm bore and 130mm stroke, giving a displacement of 5.5 litres and 11.00 litres (338 and 677 cu ins) respectively. Power outputs of 110 hp for the straight-six, and up to 350 hp at 1900 rpm for the V12. Interesting construction features included needle roller big ends, wet liners and composite pistons with stainless-steel crowns. The designer is stated as being a Mr Ricart.

Alfa-Romeo V6 Diesel Aero Engine

Alfa-Romeo V6 Diesel Aero Engine


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