Rolls-Royce Commercial Engines
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THE Dennis F2. fire-engine, which was described in "The Commercial Motor" last week, is one of the first chassis to be equipped with the Rolls
Royce engine now being offered to manufacturers of commercial vehicles.
A range of four, six and eightcylindered engines is available, developing 70-190 b.h.p. All the units have the same stroke of 44 ins, and a bore of either 31 ins. or 31 ins. Standardization of components to ease servicing problems has been given first consideration.
Light-alloy tin-plated pistons work in bores which have their upper ends protected by a thin lining of chromium to prolong their life. The cylinder head is of light alloy and has inserted valve seats of nickel-chrome molybdenum and large inlet valves operated by barrel tappets and push-rods. Austenitic exhaust valves with Stellitefaced seatings are located in the cylinder block.
To make the engine as short as possible, close cylinder centres are employed and a relatively long stroke adopted.
The new Rolls-Royce power units, announced in the "British Engineering Export Journal," will be described more fully in "The Commercial Motor" next week