Daimler Double Six 50 Limousine

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Double Six 50 Limousine





Daimler Double-Six piston engine was a sleeve-valve V12 engine manufactured by The Daimler Company Limited of Coventry, England between 1926 and 1938 in four different sizes for their flagship cars.

This engine was designed consultant Chief Engineer L H Pomeroy (1883-1941) to achieve high power with quietness and, particularly, smoothness. Pomeroy made the engine by taking the cylinder blocks of two existing 25/85hp Daimler engines and putting them on a common crankcase. Pomeroy was to be appointed managing director in 1929. The same design was produced in different sizes depending on the different engine displacements.

Announced 15 October 1926 and observed by The Observer's motoring correspondent to be Britain's first twelve-cylinder car engine. Bore and stroke 81.5 mm x 114 mm gave a swept volume of 7136 cc. Power output 150hp (110 kW; 150 PS) @ 2480 rpm. Tax rating 50hp.

The result was an engine which idled at 150 rpm and ran with uncanny silence "the only audible sound made by a Double-Six (if you opened the bonnet and went right up to it) was the almost imperceptible tick as the ignition points opened and the faint breathing of the carburettor". This largest engine faded from the catalogue after 1930

Chassis frame was channel section. Gearbox: driven through a single dry plate disc clutch mounted on the engine a separate four-speeds and reverse gearbox was mounted on a very substantial cross-member and controlled by a central ball-gate gear lever. Hand brake operated shoes in a brake drum mounted at the back of the gearbox. Power was taken by open propeller-shaft with metal universal joints to a (virtually silent) underslung worm-drive to the rear axle. Suspension was by gaitered half-elliptic leaf springs - beneath the axle at the back. Brakes on four wheels were rod-operated with assistance from a Dewandre vacuum servo positioned beside the gearbox. Adjustment could be made by hand. Steering: the width of the engine necessitated mounting the worm and sector reduction box on the scuttle. From there a coupling lever dropped to a bell-crank pivoted on the chassis side-member. A normal drag-link ran to the front axle.


Type O wheelbase 155.5 in (3,950 mm) Track 60.0 in (1,524 mm)

Type P wheelbase 163.0 in (4,140 mm) Track 60.0 in (1,524 mm)

Type W wheelbase 155.5 in (3,950 mm) Track 57.0 in (1,448 mm)

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