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Straight-twin Engine
A straight-twin engine, also known as an inline-twin, vertical-twin, or parallel-twin, is a two-cylinder piston engine whose cylinders are arranged in a line along a common crankshaft. Straight-twin engines are primarily used in motorcycles; other uses include automobiles, marine vessels, snowmobiles, Jet Skis, all-terrain vehicles, tractors and ultralight aircraft. Various different crankshaft configurations have been used for straight-twin engines, with the most common being 360 degrees, 180 degrees and 270 degrees. Terminology The straight-twin layout is also referred to as "parallel-twin", "vertical-twin" and "inline-twin". Some of these terms originally had specific meanings relating to the crankshaft angle or engine orientation, however they are often also used interchangeably. In the United Kingdom, the term "parallel-twin" is traditionally used for engines with a crankshaft angle of 360 degrees, since the two pistons are in the same direction (i.e. parallel to each o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rovena 250 1964 - Hispano Villiers Engine
Rovena is a given name and surname. Notable people with the name include: * Rovena Stefa (born 1979), Albanian singer * Rovena Marku, Olympic freestyle swimmer from Albania * Marcella Rovena Marcella Rovena (22 January 1905 – 6 October 1991) was an Italian film and voice actress. Born in Conegliano, she started her career on the big screen in 1932 with director Nunzio Malasomma Nunzio Malasomma (4 February 1894 – 12 J ..., Italian film and voice actress See also * '' Cheneya rovena'', a moth in the family Bombycidae {{given name, type=both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamaha TX750
The TX750 is a two-cylinder standard motorcycle built by Yamaha. The bike was released in 1972. Significant reliability problems affected the engines in early bikes. Yamaha made several changes to solve the problems but the bike was withdrawn from most markets after 1974 and production stopped in the home market after 1975. Chassis and suspension The TX750 had a double-cradle frame of tubular steel. Front suspension was a hydraulically-damped telescopic fork with of travel and coil springs with a rate of . There were no gaiters on the standpipes. A vane-type steering damper was fitted. At the rear was a steel swing-arm that rode in plain bearings. Springing and damping were provided by dual shock absorbers and progressively wound coil springs whose rate varied from and provided of travel. The rear-shocks were five-way adjustable units. The TX750 was the first Yamaha road bike to have aluminum wheel rims. The rims were copies of Akront valanced rims made by DID. In Europe t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamaha TDM
The Yamaha TDM is a sport touring motorcycle built by Yamaha Motor Company between 1991 and 2011. Design The TDM was not intended as an off-road machine but as a comfortable yet manoeuvrable all-rounder. A TDM is too bulky and heavy for serious off-road work, but its long-travel suspension can cope with gravel tracks. The TDM's engine was derived from the Paris-Dakar winning Yamaha XTZ 750 Super Tenere. Yamaha intended to create a motorcycle capable of handling European mountain roads and coping with rougher road surfaces. The TDM's upright riding position seemed radical in its day. The TDM was imported into the United States for only two years, 1992 and 1993. It was never a big seller in the United Kingdom nor at first in the Netherlands, but sales were strong in other European countries, particularly in France, Germany and Greece Models TDM 850 (MKI) 1991 to 1995 The Yamaha TDM is an 849 cc DOHC parallel-twin motorcycle that heralded the modern "Sport touring" categ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamaha TRX850
The Yamaha TRX850 is a sports motorcycle with a 10-valve DOHC 849 cc 270° parallel-twin engine. First released in Japan in 1995, a version for the European market was available from 1996 to 2000. Design and development The TRX has a half fairing, clip-on handlebars and mildly rear-set footrests. The front forks are conventional telescopics, and the rear suspension is a rising-rate monoshock unit. Effectively a factory-built café racer, there is meagre provision for a pillion passenger. The TRX engine was derived from that in the Yamaha TDM850, but the TRX is lighter, lower and sportier than its TDM stablemate. The engine has five valves per cylinder, three inlet and two exhaust; the inlets are 26mm, exhausts 28mm. Unusually for a dry sump design, the oil tank is not remote, but is integral to the engine, sitting atop the gearbox. This simplifies manufacture, avoids external oil lines, and gives faster oil warm-up. The shallow sump allows the engine to be sited lower, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yankee (motorcycle)
The Yankee motorcycle is a motorcycle which was produced in Schenectady, New York by the Yankee Motor Company in the 1970s. This company was started by John Taylor, a long-time resident of that area. The motorcycle used an air-cooled two-stroke engine, designed by Eduard Giró that was produced by the Ossa_(motorcycle), Ossa firm in Barcelona, Spain. The engine was a unique combination of two Ossa cylinders, that produced a twin-cylinder engine of near 500 cc capacity. The Yankee frame, designed with help from Dick Mann, and running gear were produced in the US, and the entire motorcycle was assembled in the Yankee plant on Campbell Avenue in Schenectady. External linksHistory of the Yankee Defunct motorcycle manufacturers of the United States Motorcycles introduced in the 1970s Manufacturing companies based in New York (state) Schenectady, New York {{motorcycle-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fundamental Frequency
The fundamental frequency, often referred to simply as the ''fundamental'', is defined as the lowest frequency of a periodic waveform. In music, the fundamental is the musical pitch of a note that is perceived as the lowest partial present. In terms of a superposition of sinusoids, the fundamental frequency is the lowest frequency sinusoidal in the sum of harmonically related frequencies, or the frequency of the difference between adjacent frequencies. In some contexts, the fundamental is usually abbreviated as 0, indicating the lowest frequency counting from zero. In other contexts, it is more common to abbreviate it as 1, the first harmonic. (The second harmonic is then 2 = 2⋅1, etc. In this context, the zeroth harmonic would be 0 Hz.) According to Benward's and Saker's ''Music: In Theory and Practice'': Explanation All sinusoidal and many non-sinusoidal waveforms repeat exactly over time – they are periodic. The period of a waveform is the smallest value of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two-stroke Engine
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft. A four-stroke engine requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time. Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds called the power band. Two-stroke engines have fewer moving parts than four-stroke engines. History The first commercial two-stroke engine involving cylinder compression is attributed to Scottish engineer Dugald Clerk, who patented his design in 1881. However, unlike most later two-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suzuki GS Series
The Suzuki GS series was Suzuki Motor Corporation's first full range of 4-stroke powered road motorcycles, having previously almost exclusively manufactured 2-stroke machines. Suzuki had produced the 4-stroke Colleda COX 125cc and 93cc 4-stroke single-cylinder machines in 1955 however the rest of Suzuki's production from 1952 to 1976 had been increasingly sophisticated two-stroke road machines, whose ultimate expression was the 750cc 3-cylinder water-cooled GT750. First models The first of the GS Series was the four-cylinder GS750 released alongside the GS400 parallel twin in November 1976. (1977 Model Year). The GS750 engine was essentially patterned off the Kawasaki Z1-900, and became the design basis for all air-cooled Suzuki four-stroke fours until the release of the air-oil cooled GSX-R. The GS750 engine was fitted into a dual cradle frame with telescopic forks, twin rear shocks and a front disc brake. The new GS750 was lauded for its handling at the time of its release, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamaha TX500
The Yamaha TX500 is a two-cylinder standard motorcycle built by Yamaha and sold in 1973 and 1974. Early models closely resembled the Triumph Bonneville in style. In 1975 the bike was renamed XS500 and then continued to be updated until 1978 when sales ended in the USA. In Europe, the model was available through 1980. History The TX500 debuted in Tokyo in October 1972. It arrived in most markets in 1973, along with the larger TX750. Like Yamaha's earlier XS650, both the TX500 and TX750 were four-stroke air-cooled twins. While the TX500 and TX750 were released at or near the same time, there were significant differences between their engines. The short production life of the TX500 was due in part to problems with engine leaks and failures. The TX750 experienced similar problems, which were in part attributed to aeration of the engine oil caused by the operation of the anti-vibration system. Yamaha attributed the problem to excessive heat build-up in the engine and a lack of machine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda CB450
The Honda CB450 is a standard motorcycle made by Honda from 1965 to 1974 with a 180° DOHC straight-twin engine. Producing 45 bhp (some 100 bhp/ litre), it was Honda's first "big" motorcycle, though it did not succeed in its goal of competing directly against the larger Triumphs, Nortons, and Harley-Davidsons in the North American market at the time. As a result, Honda tried again, leading to the development of the four cylinder Honda CB750 that marked a turning point for Honda and beginning of the "superbike" era of motorcycles. Design The CB450 had a distinctive chrome-sided fuel tank, and shared Honda's 'family' styling found elsewhere on the S90 and CD175. Early models were known as the 'Black Bomber', ''Motor Cycle'', 17 February 1966. Colour centrespread official Honda CB450 UK advertisement. "''Meet the big black bomber...''" "£360.0.0" Accessed 2013-08-22 or 'Dragon', but in Canada the K1 model was marketed as the 'Hellcat'. The four-speed K0 model was updated in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Revolutions Per Minute
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is a unit of rotational speed or rotational frequency for rotating machines. Standards ISO 80000-3:2019 defines a unit of rotation as the dimensionless unit equal to 1, which it refers to as a revolution, but does not define the revolution as a unit. It defines a unit of rotational frequency equal to s−1. The superseded standard ISO 80000-3:2006 did however state with reference to the unit name 'one', symbol '1', that "The special name revolution, symbol r, for this unit is widely used in specifications on rotating machines." The International System of Units (SI) does not recognize rpm as a unit, and defines the unit of frequency, Hz, as equal to s−1. :\begin 1~&\text &&=& 60~&\text \\ \frac~&\text &&=& 1~&\text \end A corresponding but distinct quantity for describing rotation is angular velocity, for which the SI unit is the ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secondary Balance
Engine balance refers to how the forces (resulting from combustion or rotating/reciprocating components) are balanced within an internal combustion engine or steam engine. The most commonly used terms are ''primary balance'' and ''secondary balance''. ''First-order balance'' and ''second-order balance'' are also used. Unbalanced forces within the engine can lead to vibrations. Causes of imbalance Although some components within the engine (such as the connecting rods) have complex motions, all motions can be separated into reciprocating and rotating components, which assists in the analysis of imbalances. Using the example of an inline engine (where the pistons are vertical), the main reciprocating motions are: * Pistons moving upwards/downwards * Connecting rods moving upwards/downwards * Connecting rods moving left/right as they rotate around the crankshaft, however the lateral vibrations caused by these movements are much smaller than the up–down vibrations caused by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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