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Cummins introduce bigger V8 diesel unit
Page 54
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• A V8 diesel which is likely to supersede the V8-265 VINE within the next 12 months has been announced by Cummins Engine Co. Ltd. Development of this unit, which is intended primarily for trucks and is being used by Mack and Autocar/Reo in America, marks a change by Cummins in its designation system. Instead of showing the number of cylinders and maximum output, configuration and cubic capacity are now indicated. The new engine is the V-903 and the 903 cu.in. (14.87 litres) displacement comes from a 5.5in. bore and 4.75in. stroke.
There is virtually no difference in size between the V-903 and the V8-265, the main change being an increase in stroke from 4.125in. Bore is the same and whereas the V8-265 weighs 1,7751b with standard accessories, the V-903 tips the scales at 2,1601b.
Compared with the V8-265, the V-903 has improved cooling and lubrication systems, stronger cylinder block with increased bearing load capacity-28 per cent greater main bearing area—and a larger and stronger crankshaft. An important feature of the new engine is that by a simple modification to the PT fuel pump—replacement of a small "button"—maximum output can be varied. Availability of three standard "buttons" provides output of 280, 300 or 320 bhp gross (SAE)—all at 2,600 rpm— and it is said that with a 25 per cent turbocharger boost, 400 bhp gross will be given. Corresponding torque figures for the three standard outputs are 620, 665 and 710 lb.ft. at 1,800 rpm respectively.