The Perkins " Threefold " Combustion System
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AN accompanying illustration shows clearly the interesting combustion system employed in the latest oil engines made by F. Perkins, Ltd., 17, Queen Street, Peterborough. We believe this to be the first time that details of the Perkins combustion chamber have been published.
The three models produced are the Wolf, 18-45 the Lynx, 24-54 h.p., and the Leopard, 24-60 h•p., and they are recommended respectively for vehicles having pay-loads up to 21 tons, from 21 tons to 31 tons, and from 3; tons to 5 tons.
Described by the maker as a combination of the air-cell and directinjection types, the combustion system ,is, as it were, threefold, as the following explanation will reveal.
Fuel is injected in two sprays, one is projected into a specially shaped cell in the cylinder head, in which a high degree of turbulence has been set sip during the compression stroke, and the other is directed on to the top of the piston, which, at the moment injection commences, is still rising.
The initial combustion occurs in the cylinder; slightly later burning begins in the air-cell, whilst during the subsequent stages the resultant of both is effective.
Detonation or " Diesel knock " is claimed to be practically eliminated by this arrangement, whilst starting up is assured. Good efficiency is afforded, the b.m.e.p. is about 100 lb. per sq. in., with a maximum torque ol 157 lb.-ft., and a consumption of 0.39 pt. per b.h.p. hr. is obtained. Perkins engines have won considerable popularity with both manufacturers and operators and are available in no fewer than 12 makes of chassis on the British market, in a number of which they are standardized.