2-LITRE SUNBEAM

Sir, I have pleasure in supplying the following details of the 2-litre Sunbeam Grand Prix car, 1924 edition, as requested by “Countryman.” Bore 67, stroke 94 mm., cub. capacity 1,988 c.c., wheelbase 8′ 61′; front track 4′ 811′, rear 3′ 111″. Overall length 13′ 7, tank capacity 29 galls. B.h.p. 135 at 5,000 r.p.m. Cylinders machined from solid billets, with spherical heads. These were welded in blocks of three. Sheet metal water jackets were fitted. Twin o.h. camshafts were gear-driven. ” Roots” type supercharger driven direct from front of crankshaft. Multi-plate ” wet ” clutch drive, via four-speed unit gearbox, and enclosed prop. shaft to straight bevel final drive. Semi-elliptic springs all round, with Duplex shockers. Four wheel brakes,

alloy-shoes, were operated by a mechanical servo driven through worm gear off rear of gearbox.

The engine was an improved and blown edition of the 3923 French G.P. winning Sunbeam. During the 1924 race H. 0. D. Segrave set up fastest lap 76.25 m.p.h. Sunbeams were also timed fastest over kilo. with ” P2 ” Alfa-Romeo next. At above 5,200 r.p.m. valve trouble set in ; new radiator and gearboxes were fitted to the team at Lyons before the race. I am, Yours etc.,

H. PRATLEY.

London, E. 18.