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Straight-twin
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Straight-twin Engine With Different Crank Shaft Angles
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] |
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] |
Primary 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] |
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] |
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] |
Triumph Thunderbird (2009)
The Triumph Thunderbird is Triumph motorcycle made in Hinckley, England, and sold since June 2009. The name "Thunderbird" is revived from a previous Triumph three-cylinder 885 cc bike. The name was previously applied to a single carburettor version of the 650cc twin Bonneville produced in the mid-1960s for police work. The final iteration was the Thunderbird Sport, last made in 2004. Design The Thunderbird is a cruiser with a large 200/50 R17 rear tyre. Design was by Tim Prentice in California. The DOHC eight-valve parallel-twin engine has two balance shafts and a 270° crank, which imitates the sound and feel of a V-twin. The engine was originally intended to be modular, namely "two-thirds of" a Triumph Rocket III engine; but after four years of development, the only parts in common are the valves. Power output is and torque is . The engine has two spark plugs per cylinder, which gives better combustion, resulting in lower fuel consumption, cleaner exhaust emis ... [...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] |
BMW F Series Parallel-twin
The BMW F series is a family of parallel-twin engine dual-sport motorcycles manufactured in Berlin, Germany by BMW Motorrad. Launched in 2008, the range comprises the F650GS, F700GS'', ''F800GS, and F800GSA. In 2012, the F700GS replaced the discontinued F650GS, and in 2013, the F800GSA was introduced with a fuel tank and a larger front fairing and screen. The F800GT and F800S both have belt drive. Models Contrary to industry convention, each model's "number" does not refer to the engine capacity. Instead, each bike in the F-series range uses essentially the same engine, but with different power outputs and equipment levels. The parallel-twin engine was first used in the F800S, and is also used in the F800GT, F800R and F800ST, although these bikes are tuned to deliver peak power at a different RPM from the GS models. The GS models have longer suspension travel, needed for offroad use. The F650GS name causes further confusion as it was previously used for a BMW bike ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda CB250N/CB400N
The Honda CB250N and CB400N Super Dream are motorcycles manufactured by the Honda Motor Company from 1978 to 1986. The successor to the short lived Dream model, it had a series of revisions including a six-speed transmission and what Honda termed as European styling which resembled the CB750F and CB900F. It was a popular model for Honda with 70,000 bikes sold in the UK alone. Engine The Super Dream was fitted with a four stroke, air-cooled, twin-cylinder engine. It had three valves per cylinder, two inlet and one exhaust, operated by a chain-driven overhead camshaft. Ignition was provided by capacitor discharge ignition (CDI). It had a 360° crank layout similar to many traditional British parallel twins, but with two balance shafts to reduce unwanted vibrations. It used a six-speed transmission and chain final drive. Fuelling was provided by twin Keihin carburettors A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control ... [...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 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 C92, CB92, C95 Benly
The Honda C92 Benly is a parallel-twin motorcycle made by Honda from 1959 through 1965. Running concurrently were the CB92 Sports and the slightly larger C95 , called the CA92 and CA95 in the US. These twins took their styling and design cues from the larger-displacement Honda C71, C76, C72, C77 Dream series. Description The name Benly comes from the Japanese word ''benri'', meaning ''convenient''. The frame was a pressed-steel, fully-welded design with the front end carrying the steering head and the rear end forming the deeply valanced mudguard. The front forks were pressed steel and carried the front mudguard. Front suspension was of the leading link type. Rear suspension was by fully enclosed telescopic dampers. Front and rear brakes were six-inch single-leading-shoe type in full-width hubs. Wheels were 16-inch. The engine was a straight- or parallel-twin, four stroke with two valves per cylinder operated by a chain-driven overhead camshaft. The compression ratio of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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