A transmission is a machine in a power transmission system, which provides controlled application of the power. Often the term refers simply to the gearbox that uses gears and gear trains to provide speed. In British English, the term refers to the whole drivetrain, including clutch, prop shaft, differential. In American English, the term more specifically to the gearbox alone. The most common use is in vehicles, where the transmission adapts the output of the internal combustion engine to the drive wheels. Such engines need to operate at a high rotational speed, which is inappropriate for starting, stopping. The transmission reduces the engine speed to the slower wheel speed. Transmissions are used on bicycles, fixed machines. Often, a transmission has multiple gear ratios with the ability to switch between them as speed varies and this switching may be done manually or automatically. Directional control may be provided, single-ratio transmissions exist, which simply change the speed and torque of motor output.
The output of the transmission is transmitted via the driveshaft to one or more differentials, while a differential may provide gear reduction, its primary purpose is to permit the wheels at either end of an axle to rotate at different speeds as it changes the direction of rotation. Conventional gear/belt transmissions are not the mechanism for speed/torque adaptation. Alternative mechanisms include torque converters and power transformation, automatic transmissions use a valve body to shift gears using fluid pressures in conjunction with an ecm. Early transmissions included the right-angle drives and other gearing in windmills, horse-powered devices, and steam engines, in support of pumping, most modern gearboxes are used to increase torque while reducing the speed of a prime mover output shaft. This means that the shaft of a gearbox rotates at a slower rate than the input shaft. A gearbox can be set up to do the opposite and provide an increase in speed with a reduction of torque. Some of the simplest gearboxes merely change the rotational direction of power transmission.
Many typical automobile transmissions include the ability to select one of several gear ratios, in this case, most of the gear ratios are used to slow down the output speed of the engine and increase torque
Compared to OHV pushrod systems with the same number of valves, the reciprocating components of the OHC system are fewer and have a lower overall mass. Though the system drives the camshafts may be more complex, most engine manufacturers accept that added complexity as a trade-off for better engine performance. The fundamental reason for the OHC valvetrain is that it offers an increase in the ability to exchange induction. Another performance advantage is gained as a result of the better optimised port configurations made possible with overhead camshaft designs, with no intrusive pushrods, the overhead camshaft cylinder head design can use straighter ports of more advantageous cross-section and length. The OHC design allows for higher speeds than comparable cam-in-block designs. The higher engine speeds thus allowed increases power output for a given torque output, in earlier OHC systems, including inter-war Morrises and Wolseleys, oil leaks in the lubrication systems were an issue. Single overhead camshaft is a design in which one camshaft is placed within the cylinder head, in the SOHC design, the camshaft operates the valves directly, traditionally via a bucket tappet, or via an intermediary rocker arm. SOHC cylinder heads are less expensive to manufacture than double overhead camshaft cylinder heads.
Timing belt replacement can be easier since there are fewer camshaft drive sprockets that need to be aligned during the replacement procedure, SOHC designs offer reduced complexity compared to overhead valve designs — when used for multivalve cylinder heads, in which each cylinder has more than two valves. Exhaust and inlet manifolds were both on the side of the engine block. This did, offer excellent access to the spark plugs, in the early 1980s, Toyota and Volkswagen Group used a directly actuated, SOHC parallel valve configuration with two valves for each cylinder. The Toyota system used hydraulic tappets, the Volkswagen system used bucket tappets with shims for valve clearance adjustment. Honda used a similar system in their motorcycles, using the term Unicam for the concept. This system uses one camshaft for each bank of cylinder heads, with the cams operating directly onto the valve and indirectly, through a short rocker arm. This allows a compact, light valvetrain to operate valves in a combustion chamber.
The Unicam valve train was first used in single cylinder dirt bikes, a dual overhead camshaft valvetrain layout is characterised by two camshafts located within the cylinder head, one operating the intake valves and the other one operating the exhaust valves. This design reduces valvetrain inertia more than is the case with a SOHC engine, a DOHC design permits a wider angle between intake and exhaust valves than do SOHC engines. This can allow for a less restricted airflow at higher engine speeds, DOHC with a multivalve design allows for the optimum placement of the spark plug which, in turn, improves combustion efficiency
Tour de France Automobile
Tour de France Automobile was a sports car race held on roads around France regularly – mostly annually – between 1899 and 1986. The first edition was held in 1899 at speeds of 30 mph, the first event was won by René de Knyff driving a Panhard et Levassor. Out of 49 starters,21 vehicles finished, the 1908 event was won by Clément-Bayard. The 1951 event was won by Pagnibon-Barracquet in a 2. 6-litre Ferrari, the event visited La Turbie Hill Climb, near Nice. In 1954 the event was won by the 2.5 litre Gordini of Jacques Pollet and M. Gauthier, the 1956 event was won by de Portago/Nelson in a Ferrari 2502.9 with Moss/Houel in second place. The 1960 Tour de France took place between September 15 and 23 that year, starting at Nice it visited Mont Ventoux, Spa, Montlhéry, Rouen and Le Mans with the finish at Clermont Ferrand. The event was won overall by the Ferrari 250 G. T. of Willy Mairesse/Georges Berger, the Jaguar 3.8 litre Mk. II of Bernard Consten/J. Renel won the Touring category with the BMW700 coupé of Metternich/Hohenlohe winning the Index of Performance, the 1964 event was won by Lucien Bianchi/Georges Berger in a Ferrari GTO, entered by Ecurie Nationale Belge.
The event started at Lille, visiting Reims, Rouen, Le Mans, Clermont-Ferrand, the Touring car category was won by Peter Procter/Andrew Cowan in a Ford Mustang, entered by Alan Mann Racing. The A. C. Shelby Cobras of Maurice Trintignant, Bob Bondurant, the 1980s saw the event incorporated into the European Rally Championship which saw an influx of new competitors. The last event was held in 1986, known as Tour Auto, it was revived in 1992 for historic cars, with both a competition and a regularity class. The format is a 5-day event combining about 2,500 km of roads,4 or 5 circuit races and 6 to 8 hillclimbs, patrick Peter of Agence Peter is the organiser. The start of the International event with some 300 entrants is in Paris, the winning cars over the years, Ford Shelby Mustang 350GT, Ford GT40, AC Cobra 289, Lotus Elan, Ferrari Daytona Gr IV
Berlinetta is an especially sporty form of coupé. Typically a two-seater, the type may include 2+2s, the original meaning for berlinetta in Italian is “little saloon”. Introduced in the 1930s, the term was popularized by Ferrari in the 1950s, Opel, Alfa Romeo, and other European car manufacturers have used the Berlinetta label. In North America, Chevrolet produced a version of the Chevrolet Camaro called the Berlinetta, the model offered European styling touches to emphasize the interior rather than the performance of the car, which had long been the main selling point of the Camaro
The Ferrari Daytona, officially designated the Ferrari 365 GTB/4, is a two-seat grand tourer produced by Ferrari from 1968 to 1973. It was introduced at the Paris Auto Salon in 1968 to replace the 275 GTB/4, the Daytona was succeeded by the mid-engined 365 GT4 Berlinetta Boxer in 1973. To this day, Ferrari itself only rarely refers to the 365 as the Daytona, unlike Lamborghinis then-new, mid-engined Miura, the Daytona was a traditional front-engined, rear-drive car. At a compression ratio of 9.3,1, it produced 357 PS, 0-60 mph acceleration was just 5.4 seconds. The five-speed manual transmission was mounted in the rear for optimal weight distribution, although a Pininfarina design, as with many previous Ferrari road cars styled by Leonardo Fioravanti, the 365 GTB/4 was radically different. Its sharp-edged styling resembled a Lamborghini more than a traditional Pininfarina Ferrari, early Daytonas featured fixed headlights behind an acrylic glass cover. A new U. S. safety regulation banning headlights behind covers resulted in retractable pop-up twin headlights in 1971, the generally accepted total number of Daytonas from the Ferrari club historians is 1,406 over the life of the model.
This figure includes 156 UK right-hand-drive coupés,122 factory-made spyders, all bodies except the first Pininfarina prototype were produced by Italian coachbuilder Scaglietti, which at the time already had a reputable record of working with Ferrari. Historically, and especially since the mid-1980s and early 1990s, there has mostly been a market price difference between a real berlinetta and a real spyder. Many berlinettas were turned into spyders by aftermarket mechanics, often to increase the monetary value or simply because of the owners preference for an open car. Differences in value have typically remained, even after the most skillful conversions, no Berlinettas were converted into Spyders by Scaglietti, Ferrari would not allow this, or now. The first racing version of the 365GTB/4 was prepared in 1969, Ferrari did not produce an official competition car until late in 1970. The official cars were built in three batches of five each, in 1970-1,1972 and 1973. They all featured a lightweight body making use of aluminium and fibreglass panels, the engine was unchanged from the road car in the first batch of competition cars, but tuned in the latter two batches.
The cars were not raced by the official Scuderia Ferrari team and they enjoyed particular success in the 24 Hours of Le Mans, with results including a 5th overall in 1971, followed by GT class wins in 1972,1973 and 1974. In 1972 Ferrari 365 GTB/4s took the first 5 places of the GT class, the final major success of the car was in 1979, when a 1973 car achieved a class victory in the 24 Hours of Daytona. In 1971, the Daytona gained fame when one was driven by Dan Gurney and Brock Yates in the inaugural Cannonball Baker Sea-To-Shining-Sea Memorial Trophy Dash. Showcasing the cars potential for sustained high speed travel, the pair won with an speed of 80.1 miles per hour
Ferrari 195 S
See the 195 Inter grand tourer The 195 S was a racing sports car produced by Ferrari in 1950. Introduced at the Giro di Sicilia on April 2,1950, the two cars, one open and one closed coupe, shared that cars 2250 mm wheelbase but sported an enlarged 2.3 L version of the Colombo V12. These two initial cars were forced to retire, but three came to the Mille Miglia of that year, with the event won by the 195 S Touring coupe of Giannino Marzotto, Ferrari, A Complete Guide to All Models
Governments and private organizations have developed car classification schemes that are used for innumerable purposes including regulation and categorization, among others. This article details commonly used classification schemes in use worldwide, vehicles can be categorized in numerous ways. Regulatory agencies may establish a vehicle classification system for determining a tax amount, in the United Kingdom, a vehicle is taxed according to the vehicles construction, weight, type of fuel and emissions, as well as the purpose for which it is used. Other jurisdictions may determine vehicle tax based upon environmental principles, such as the user pays principle, another standard for road vehicles of all types that is used internationally, is ISO 3833-1977. In the United States, since 2010 the Insurance Institute for Highway Safety uses a scheme it has developed that takes into account a combination of both shadow and weight. The United States Federal Highway Administration has developed a scheme used for automatically calculating road use tolls.
There are two categories depending on whether the vehicle carries passengers or commodities. Vehicles that carry commodities are further subdivided by number of axles and number of units, the United States Environmental Protection Agency has developed a classification scheme used to compare fuel economy among similar vehicles. Passenger vehicles are classified based on a total interior passenger. Trucks are classified based upon their gross vehicle weight rating, heavy duty vehicles are not included within the EPA scheme. A similar set of classes is used by the Canadian EPA, in Australia, the Federal Chamber of Automotive Industries publishes its own classifications. This is a table listing several different methods of vehicle classification. Straddling the boundary between car and motorbike, these vehicles have engines under 1.0 litre, typically only two passengers, and are sometimes unorthodox in construction. Some microcars are three-wheelers, while the majority have four wheels, microcars were popular in post-war Europe, where their appearance led them to be called Bubble cars.
More recent microcars are often electric powered, the size of ultracompact cars will be less than minicars, but have engine greater than 50cc displacement and able to transport 1 or 2 persons. Ultracompact cars cannot use standard, because of strict safety standards for minicars. The regulation about running capacity and safety performance of cars will be published in early autumn. Today, there are smaller than ultracompact cars, called category-1 motorized vehicles which it has 50cc displacement or less
The Ferrari 275 is a series of two-seat front-engined V12-powered automobiles produced in GT, and spyder form by Ferrari between 1964 and 1968. The first Ferrari to be equipped with a transaxle, the 275 is powered by a 3.3 L Colombo 60° V12 engine that produces 280-300 hp, Pininfarina designed the GT and roadster bodies, Scaglietti the rare NART Spyder, among the most valuable of all Ferraris made. In a contemporary road test, Road & Track described it as the most satisfying car in the world. Motor Trend Classic named the 275 GTB gran turismo/GTS roadster as number three in their list of the ten Greatest Ferraris of all time, the 275 GTB/4 debuted in 1966. A much updated 275 GTB, the four overhead camshaft, six 2-barrel carbuerated 275 GTB/4 was named number seven on Sports Car Internationals 2004 list of Top Sports Cars of the 1960s. The 275 GTB was a gran turismo automobile produced between 1964 and 1968 with a 3.3 litre Colombo 60-degree V-12 engine displacing 275 cc per cylinder. The standard 275 GTB coupe was produced by Scaglietti and was available with 3 or 6 Weber twin-choke carburettors and it was more of a pure sports car than the GT name suggested.
Some cars were built with a body instead of the standard steel body. A Series Two version with a longer nose appeared in 1965, for the 1965 racing season,4 lightweight 275 GTB Competizione Speciales, a prototype and three production models, were built and equipped with 250 LM engines. The design was by Pininfarina and the coachwork by Scaglietti, mauro Forghieri designed a special super-lightweight steel and aluminium version of the 275 GTB chassis. A regular suspension was fitted, but it was slightly stiffer by the addition of extra springs. In all, this focus on saving weight made a difference of over 150 kg compared to the alloy bodied road cars, like the four Competizione Speciales, the 275 GTB/C was powered by the 250 LM engine. Somehow Ferrari forgot to mention to the body that the 275 GTB had a six carburetor option. Specifically for the 275 GTB/C, Weber constructed the 40 DF13 carburetor of which three would replace the six 38 DCNs found on the 250 LM, the rest of the drivetrain was similar to the 275 GTB, but strengthened slightly.
Two of the twelve built were sold for street use, unlike the race cars, these street cars were fitted with alloy wheels shod with Pirelli tires. Competition cars were fitted with special Borrani wire wheels, shod with Dunlops latest racing tires and it was this combination that would prove to be the weak spot of the 275 GTB/C, the tires had so much grip that they could overstress and break the spokes on the wheels. After the 275 GTB/C, no competition Ferrari would be fitted with wire wheels again, a British-entered 275 GTB/C finished 8th overall, gaining class victory in the 196624 Hours of Le Mans. Pininfarina built 200275 GTS roadsters for the American market between 1964-1966 with entirely different bodywork, the 275 GTS was replaced by the 330 GTS, leaving no 3.3 L convertible in the range until the creation of the 275 GTB/4 NART Spider
In both road and rail vehicles, the wheelbase is the distance between the centers of the front and rear wheels. For road vehicles with more than two axles, the wheelbase is defined as the distance between the axle and the centerpoint of the driving axle group. In the case of a truck, the wheelbase would be the distance between the steering axle and a point midway between the two rear axles. The wheelbase of a vehicle equals the distance between its front and rear wheels, at equilibrium, the total torque of the forces acting on a vehicle is zero. So, for example, when a truck is loaded, its center of gravity shifts rearward, the amount the vehicle sinks will depend on counter acting forces like the size of the tires, tire pressure, and the stiffness of the suspension. If the vehicle is accelerating or decelerating, extra torque is placed on the rear or front tire respectively, so, as is common experience, when the vehicle accelerates, the rear usually sinks and the front rises depending on the suspension.
Likewise, when braking the front noses down and the rear rises, because of the effect the wheelbase has on the weight distribution of the vehicle, wheelbase dimensions are crucial to the balance and steering. For example, a car with a greater weight load on the rear tends to understeer due to the lack of the load on the front tires. This is why it is crucial, when towing a single-axle caravan, likewise, a car may oversteer or even spin out if there is too much force on the front tires and not enough on the rear tires. Also, when turning there is lateral torque placed upon the tires which imparts a turning force that depends upon the length of the distances from the CM. Wheelbases provide the basis for one of the most common vehicle size class systems, some luxury vehicles are offered with long-wheelbase variants to increase the spaciousness and therefore the luxury of the vehicle. Prime Minister of the United Kingdom Tony Blair was given a version of the Rover 75 for official use. In contrast, coupé varieties of vehicles such as the Honda Accord are usually built on shorter wheelbases than the sedans they are derived from.
The wheelbase on many commercially available bicycles and motorcycles is so short, relative to the height of their centers of mass, in skateboarding the word wheelbase is used for the distance between the two inner pairs of mounting holes on the deck. This is different from the distance between the centers of the two wheel pairs. A reason for this use is that decks are sold with prefabricated holes. It is therefore easier to use the holes for measuring and describing this characteristic of the deck. A common misconception is that the choice of wheelbase is influenced by the height of the skateboarder, the length of the deck would be a better candidate, because the wheelbase affects characteristics useful in different speeds or terrains regardless of the height of the skateboarder