General Information

Serial #

24544NA

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

TUBULAR METAL FRAME/ IRON ENGINE/ LEATHER SEAT/ GLASS HEADLIGHT/ RUBBER HANDLE GRIPS & FOOT REST COVERS/ PLASTIC REAR LIGHT/ ALLOY CYLINDER HEADS

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

204.0 cm

Width

73.0 cm

Height

99.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Motorized Ground Transportation

Category

Motorcycle vehicles

Sub-Category

N/A

Manufacturer

AKA

TRIUMPH

Country

England

State/Province

Unknown

City

Coventry

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

Triumph, one of the most famous motorcycle builders, was founded in Britain by two Germans, Siegfried Bettman and Mauritz Schulte, who set up the company in 1897 to build bicycles. They produced their first motorbike in 1902, and it was followed by a variety of machines, ranging from a 225 cc two-stroke to 500 cc four-valve singles. During the First World War, Triumph Motorcycles sold more than 30,000 of its Triumph Type H model to allied forces. In 1936 Triumph came under the same ownership as the Ariel company and a new designer, Edward Turner from Ariel, was appointed. Turner updated many of the existing designs and was responsible for Triumph's most significant creation, the Speed Twin that became the basis for Triumph's bikes until the 1980s.

Function

GENERAL TRANSPORTATION

Technical

The Triumph 5TW, a design that emerged during the Second World War, was an ill-timed motorcycle. By the time it was ready for production, the war was over and the military had a surplus of motorcycles and was not interested in buying more. However, two years later, in 1948, the TRW emerged in its final engine form and, while few were sold to the British Army, other branches of the military, both at home and abroad, bought enough machines to keep the line going into the 1960s. The TRW was essentially a hybrid as it combined the 500 cc side-valve engine (designed during wartime) with as many parts as possible from the commercial production machine in order to keep costs to a reasonable level. In its final form, the TRW engine followed many of the lines of the prototype with a simple, vertically split crankcase carrying the crankshaft and gear-driven camshaft at the front of the engine. The crankshaft, however, was a different form. The design allowed the use of one-piece connecting rods with plain big ends by clamping the crankpins to the central flywheel. The outer webs were forged in a 3 percent nickel steel with an integral half shaft and a crankpin which extended at a slightly reduced diameter into a hole in the flywheel. A bush was trapped between the two crankpins to prevent loss of oil pressure and the webs of the flywheel were slit. Once assembled, two cross-bolts with nuts were fitted, and when tightened these clamped the flywheel to the crankpins. Alignment was assisted by a close-tolerance hole in the two web cheeks and the flywheel. The crankshaft ran on a drive-side ball race with a plain timing-side bush. the camshaft was carried in two bushes and driven by an idler meshed with the crankshaft gear, this idler also driving the magneto. The cylinder block was an alloy casting with the two liners pressed in and the valve seats cast in pairs. It incorporated a number of vertical webs in the finning to remove any tendency for them to ring and followed the lines of the prototype with regard to the ports. The valve chest was at the front and pressed-in guides were located by a cross-pin, which prevented the tappets from turning by bearing on flats machined on them. The compression ration was 6:1 and the pistons were conventional, with solid skirts and three rings, two compression and on scraper. The cylinder head was a one-piece sand casting fitted with a gasket and secured with 12 studs and nuts.

Area Notes

Unknown

Details

Markings

STAMPED INTO FRAME BY HEADLIGHT ON LEFT SIDE: `24544NA'/ STAMPED INTO ENGINE CASING ON LEFT IS: `TRW 25818X NA'/ PLATE ON FRONT LEFT OF ENGINE CASING READS: `RCENE/ REBUILT ENGINE/WORKSHOP/ 204/ DATE/ 12 2 58/ INSPECTED BY/ 1207/ ENGINE NO/ 16974/ CYL BORE/ STD/ MAINS/ STD/ THROWS/ STD/ CONN ROD'/ PLATE ON RIGHT OF ENGINE COVER READS: `TRIUMPH/ 500 S.V. TWIN/ MADE UNDER PATENT NO/ 469,635/ 529,443/ 559,833'/ `TRIUMPH' PLATE ON BOTH SIDES OF FUEL TANK/ STAMPED INTO COVER BY GEAR SHIFT IS: `81097/ WR'/ IN RAISED LETTERS ON RUBBER FUEL TANK PADS IS: `TRIUMPH'/ PLATE ON REAR OF SEAT READS: `MADE IN/ LYCETT/ ENGLAND'

Missing

REAR SEAT

Finish

FRAME, FORKS, HEADLIGHT CASE, FENDERS, REAR LUGGAGE RACK ALL PAINTED BLACK/ WHITE TAPE ON FUEL TANK & FENDERS/ CHROMED HEADLIGHT RIM

Decoration

STRIP OF WHITE TAPE ON BOTH FENDERS/ WHITE TAPE ON FUEL TANK