Velocette Venom
Manufacturer | Velocette |
---|---|
Production | 1955–70 |
Engine | 499 cc, OHV air-cooled single |
Bore / stroke | 86.0 mm × 86.0 mm (3.39 in × 3.39 in) |
Top speed | 100 mph[1][2] |
Power | 34 bhp @ 6,200 rpm[1] |
Brakes | drum brakes |
Wheelbase | 54.75 inches (139.1 cm) |
Weight | 390lb (177 kg) (dry) |
The Velocette Venom was a 499 cc single-cylinder four-stroke British motorcycle made by Velocette at Hall Green in Birmingham.[3] A total of 5,721 machines were produced between 1955 and 1970.
In 1961 a factory-prepared faired Velocette Venom and a team of riders set the 24-hour world record at a speed of 100.05 mph (161.01 km/h) at the Autodrome de Linas-Montlhéry, a banked oval racetrack in France. It was the first motorcycle to average over 100 mph continuously for 24 hours and no 500cc or single-cylinder motorcycle has broken this record.[4]
In 1965, the Velocette Venom was further developed with a full racing kit to create the range-topping Velocette Thruxton, with a special cylinder head developed by American flat-track racers, and adapted by Velocette to create a new production racer. It was a very popular and successful clubman racer, winning the 1967 Isle of Man Production TT. The Thruxton became the most popular Velocette model, but could not save the Velocette company from bankruptcy in 1971.[3] Poor trading conditions over a number of preceding years forced the company into voluntarily liquidation in 1971,[5] with all the remaining stock and tools sold off to pay creditors.[6]
An interesting use of the Venom power train was the Indian Velo 500, an updated, limited-production run of 250 machines devised by American entrepreneur Floyd Clymer, using a Velocette engine with Italian cycle parts.[7]
Development
Introduced in November 1955 and launched at the same time as the 349 cc Velocette Viper, the single-cylinder Venom was developed from the Velocette MSS and needed to compete against a new range of British twin-cylinder motorcycles. Conceived by Velocette’s Eugene Goodman and designed by Charles Udall, the Venom's 499 cc engine had a bi-metal cylinder with a cast-iron liner, high compression piston and a light alloy cylinder head. The design of the engine's high cam with short push-rods was simpler to produce than an overhead camshaft engine.[8]
The Venom had high quality chrome plating and was finished in black paintwork with gold pinstriping. The Sport models
An unusual feature of the Venom design is that the clutch was between the gearbox and gearbox sprocket rather than the conventional configuration in the primary chain case on the far left, with the gearbox sprocket between the clutch and the gearbox. This made the clutch less accessible but allowed for easy gearing changes and a range of sprockets with different numbers of teeth could be fitted by removing the sprocket cover.[12] The gearbox was also a novel Velocette design with a constant mesh close ratio unit that could be maintained relatively easily while still in place.
Simply designed with single top and down tubes, the Venom's heavy
The Venom used Miller electrics up to 1962, with a belt-driven
Eventually becoming the best selling 'flagship' of the Velocette motorcycle range, the Venom has become highly sought after as a definitive example of a British sports four-stroke single.[6]
Venom Scrambler
In December 1958,[14] the Velocette development team built Venom off-road motorcycles, which were sent to the United States for evaluation in enduro events.[15] Built to the Viper Clubman standard and advertised with the slogan "A winner in every respect", the Scrambler had a specially lightened frame, light alloy mudguards and high-level enduro-style exhaust pipes. A special off-road Venom was named the Endurance. Fitted with the Venom engine, it had a 21-inch front wheel, high handlebars and a small fuel tank, as well as full lighting so that it could be legally used on the roads.[6]
Venom Clubman
From 1960, Velocette produced the Venom (and the Viper) in a Clubman racing version, fitted with
Velocette Venom Thruxton
In 1965, the well-proven Venom was improved by Velocette designer Bertie Goodman with a special race kit complete with radically revised cylinder head, an
24-hour world record
On 18 March 1961 a factory-prepared Velocette Venom Clubman with fairing set the 24-hour world record at an average speed of 100.05 mph (161.01 km/h).[2][18] It was the first motorcycle of any size to top the 100 mph in 24 hours and, as at 2008, no motorcycle of the same capacity has been able to equal or improve on this record.[4] The record attempt took place at the Montlhéry oval track, a 2.7 km (1.7 miles) concrete track just outside Paris with a very uneven road surface and poor track lighting.[19] A team of six French riders were accompanied by Motor Cycling journalist Bruce Main-Smith, who achieved the best lap time of 107 mph despite the poor lighting conditions. After securing the 12-hour record at more than 104 mph (167 km/h), the team went on to complete the 24-hour endurance record attempt. Stopping only to change riders and refuel (from a bucket using a funnel), the Venom secured the world record. The publicity was very important for Velocette, as the success revived sales of the Venom, which went on to become one of Velocette's best-selling motorcycles.[16] The Venom which set the 24-hour world record is on display at the British National Motorcycle Museum.[20]
Racing success
At the 1964 Thruxton 500 endurance race, Velocette Venoms took the first three places in the 500 cc category, with winners Alan Harris and Howard German on a Stevens-entered machine finishing third overall in with the larger-capacity machines.[21][22]
A specially styled, high-performance 'Thruxton' version of the Venom with high-quality equipment was announced in late 1964, and subsequently a Thruxton ridden by
In 1967 two Venom Thruxton motorcycles, ridden by Neil Kelly and Keith Heckles gained first and second places in the Production TT, a category for road-based machines with limited controlled-modifications first staged at the Isle of Man in that year; Kelly also recorded the fastest lap at 91 mph.[3] Prepared by Reg Orpin, workshop manager at London Velocette dealer L.Stevens,[23] the winning motorcycle was far from standard, for as well as being in Thruxton trim, the valve gear included titanium tips to the pushrods and valve caps. A Norton Manx piston had been specially engineered at Velocette's Hall Green Workshops, and it had cam followers on needle rollers as well as light alloy timing wheels. It was nearly all for nothing, however, as Kelly failed to start and the rest of the field left him struggling to kick start the Venom. Orpin managed to start it just in time, and despite his poor start, Neil Kelly caught up with the other riders within three miles and went on to win the 500 cc class, recording 121 mph as he passed the Highlander speed trap.[16]
Further development
The Indian Velo 500 was a limited-production run of updated machines conceived by American entrepreneur Floyd Clymer in 1968, using a Velocette engine and gearbox with mainly Italian cycle parts, including a lightweight frame from the Italjet company, Marzocchi front forks with Grimeca front hub having a twin-leading shoe brake, Borrani aluminium rims and quickly-detachable tank and seat, resulting in a weight-saving of 45 lb (20 kg) compared to the traditional Venom.[7]
The project ended abruptly due to Clymer's death and the failure of Velocette, with 200 machines shipped to US and a further 50 remaining in Italy, which were bought by London Velocette dealer Geoff Dodkin. When roadtesting, UK monthly magazine Motorcycle Sport described it as "British engineering and Italian styling in a package originally intended for the American market", reporting that Dodkin would supply his bikes with either a standard Venom engine specification, or, at higher cost, a Thruxton version.[7][24]
References
- ^ ISBN 978-0-8109-6912-4.
Velocette Venom 499 cc • 1963 • United Kingdom • Bore x Stroke: 86 x 86 mm • Power output: 34 hp @ 6,200 rpm • Top speed: 105 mph (169 km/h) • Collection of Harry Lindsay
- ^ ISBN 978-07853-3350-0.
The single cylinder Venom was introduced in the late Fifties, and while it was a capable sporting machine, it was overshadowed by various British twins. It's 500-cc engine produced a very respectable 36 horsepower, enough to propel the Venom to near 100 mph. A Venom equipped with the 'Clubman' option could top the century mark.
- ^ ISBN 978-1-86147-136-9.
- ^ ISBN 978-1-84797-072-5.
- ^ The Classic Motor Cycle, Goodman on Velocette, interview with Peter Goodman, by Dennis Frost, pp.47-51. Accessed 15 June 2016
- ^ ISBN 978-1-85648-166-3.
- ^ a b c Motorcycle Sport, July 1971 pp.253-255, 262-263, 271-272. Road Test - Indian Velo 500 Accessed 2014-05-14
- ^ a b c Melling, Frank. "Memorable MC Venom Thruxton". Retrieved 31 May 2009.
- ^ The Classic MotorCycle, July 1996, p.27 Shaping the Future by Roy Poynting. "Engine/gearbox fairing for the so-called Sports Velocettes was not a sales success story". Accessed and added 2014-09-25
- ^ Motorcycle Mechanics, April 1966. pp.60–61 Road test. "Another unique point about the Velo are the glass-fibre enclosure panels around both sides of the engine and gearbox. They cover all the lower parts of the engine and gearbox, and make the Velo one of the few bikes one can ride in decent street clothing without danger of oily smuts and splashes. The only tool needed to remove them is a bronze penny, and they come off within seconds" Accessed and added 2014-09-25
- ^ ISBN 978-0-86363-010-1.
- ^ Motorcycle Mechanics, April 1966. pp.60–61 Road test Accessed and added 2014-09-24
- ^ Motorcycle Mechanics, April 1966. pp.60–61 Road test. "Built rather on the heavy side, the frame is a solid example of traditional British craftmanship, and coupled with the chunky Velo forks and the finely adjustable rear suspension, is responsible for the absolutely unshakeable steering. With the current rage for special building, one is tempted to wonder why the Velo frame and cycle parts are not more popular with the powerhouse Bonneville boys—..." Accessed and added 2014-09-25
- ^ Gibbison, David. "Velocette Evolution". Retrieved 30 May 2009.
- ^ "Velocette Viper Scrambler". Retrieved 30 May 2009.
- ^ ISBN 978-1-85260-033-4.
- ^ Clement Salvadori (November–December 2009). "1962 Velocette Venom Clubman". Motorcycle Classics. Retrieved 8 October 2009.
- ISBN 9789036614979.
...in 1956 there were two super sports machines, the Venom 500 cc and the Viper 350 cc. This year saw the introduction of an uprated LE called the Valiant, which was phased out in 1963, but not before the Vogue version was introduced.
A great feat was achieved when a Venom set the 24 hour world record for a 500 cc motorcycle, reaching 100.05 mph at the Montlhéry banked circuit south of Paris in France on 18–19 March 1961. - ^ d'Orleans, Paul. "24 hour record". Retrieved 31 May 2009.
- ^ "The Velocette Owners Club". Retrieved 6 June 2009.
- ^ Motor Cycle, 3 August 1964, p9. Block Advert Dealer Entrants for the Thruxton '500'. "L.Stevens, 500 cc Class Winners (Alan Harris and Howard German)". Accessed 2014-05-25
- ^ Thruxton 500 results Southampton & District Motor Cycle Club. Official Site. Retrieved 2014-05-25
- ^ Motorcycle Mechanics, October 1966, pp.30,31 Thrilling Thruxton Road test "When Reg Orpin, of L. Stevens, built up this superb piece of machinery from an old hack 500 that was bought-in, he did it not just as a showpiece but as an example of what his firm can do for any of their customers' Velos". Accessed 2014-05-09
- The Classic Motor CycleJuly 1996, p.39 Register that Thruxton. "In July 1968, Floyd Clymer bought a Thruxton engine...records show that 26 more engines were sold to Clymer in November 1968, with a final 18 the following January". Accessed and added 2014-06-27