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Rootes Adopt Perkins Six 354

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5th May 1961

Page 120

Page 120, 5th May 1961 — Rootes Adopt Perkins Six 354

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IT is announced today by Rootes that in future the sole oil-engine option for Commer Superpoise 5and 6-tonners. Commer 4-; 5and 6-ton forward-control models, and Karrier, Gamecock 3and 4-tonners will in future be the Perkins Six 354 5.8-litre direct-injection engine. For the .forward-control models a horizontal version of this unit has been specially developed, but the standard vertical engine is employed in the Superpoise vehicles.

In the case of Commer 4-ton forwardcontrol and Karrier Gamecock chassis, the engine is de-rated slightly to produce 92 b.h.p. (net) and 225 lb.-ft. torque. In all other models the Six 354 is rated to produce 103 b.h.p. (net) at 2.600 r.p.m. and 254 lb.-ft. at 1.450 r.p.m.

In forward-control chassis the Perkins engine is mounted at an angle of 66°, with the cylinder head towards the righthand side of the frame. Basically, this version of the engine is the same as the vertical type, but the sump is special. and changes have been made to crankcase ventilation piping and the inlet manifold. The dynamo is mounted beneath the crankcase, whilst the injectors—being on H4 the upper side of the cylinder head—are readily accessible.

Concurrent with the introduction of this new engine, specification changes concerning the braking and transmission of the models to which the Six 354 can be fitted have been announced. A four-speed synchromesh gearbox has been introduced. This has forward ratios of 7.227, 3.478, 1.838, and 1 to 1, with an 8.431-to-1 reverse gear.

Rear-axle ratios have been revised, the Superpoise models having a home-market ratio of 5.125 to I. and the 4-ton forward-control and Karrier Gamecock chassis having. a standard ratio of 4.88

to 1. The 5and 6-ton forward-control vehicles have 5.125-to-1 axles. Normaland forward-control 6-tonners for export have 5.857-to-1 axles.

The revised gearings give road speeds varying between 45 and 54 m.p.h. in the case of different models, with gradient abilities ranging between1-in-2.5 and 1-in-4.25. Braking areas have been increased, the area on the 5and 6-ton forward-control models having been raised from 438 sq. in. to 482 sq. in., this new figure applying to the 6-ton normalcontrol chassis also. The 5-ton normalcontrol vehicle has a new braking area of 451 sq. in.