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Overhead Valve
An overhead valve (OHV) engine, sometimes called a ''pushrod engine'', is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with earlier flathead engines, where the valves were located below the combustion chamber in the engine block. Although an overhead camshaft (OHC) engine also has overhead valves, the common usage of the term "overhead valve engine" is limited to engines where the camshaft is located in the engine block. In these traditional OHV engines, the motion of the camshaft is transferred using pushrods (hence the term "pushrod engine") and rocker arms to operate the valves at the top of the engine. Some early intake-over-exhaust engines used a hybrid design combining elements of both side-valves and overhead valves. History Predecessors The first internal combustion engines were based on steam engines and therefore used slide valves. This was the case for the first Otto engine, which was first s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pushrod2
A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gasses out of the combustion chamber once combustion is completed. Layout The valvetrain layout is largely dependent on the location of the camshaft. The common valvetrain configurations for piston engines - in order from oldest to newest - are: * Flathead engine: The camshaft and the valves are located in the engine block below the combustion chamber. * Overhead valve engine: The camshaft remains in the block, however the valves are located in the cylinder head above the combustion chamber. * Overhead camshaft engine: The valves and camshaft(s) are in the cylinder head above the combustion chamber. Components The valvetrain consists of all the compo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marr (automobile)
The Marr Auto-Car was an automobile built in Elgin, Illinois by the Marr Auto-Car Company from 1902 to 1904. History The car was designed by early automobile pioneer Walter L. Marr who had worked as an engine designer for Buick in 1901 and went on to be Chief Engineer there from 1904 to 1918. The Marr was a two-seat runabout with a single-cylinder 1.7L engine that was mounted under the seat. The engine is one of the first known to have featured an overhead camshaft (OHC). The vehicle had the first tilt steering wheel, changeable speed gears on a planetary transmission and a revolutionary new carburetor A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meteri .... Factory price was $600, (). The plant burned to the ground in August 1904 with 14 cars inside. Only one Marr Auto-Car is exta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Motors LS-based Small-block Engine
"LS engine" is the colloquial name given to the third and fourth generation small-block V8 gasoline engine used in General Motors' vehicles. The name evolved from the need to differentiate the Gen 3/Gen 4 small blocks from the original Gen 1/Gen 2 small blocks released in 1954, which are commonly referred to as "Small Block Chevrolets". The "LS" name originates from the engine RPO code of the first Gen 3 small block, the LS1, introduced in the 1997 Corvette. The term "LS engine" is used to describe any Gen 3 or Gen 4 Small Block Chevrolet, including those that do not specifically include "LS" as part of their RPO code. Sometimes referred to as an "LSx", with the lower case "x" standing in for one of the many RPO code variations of the motor, the term can cause confusion since GM now sells an aftermarket LS cylinder block named "LSX" with a capital "X". The original RPO code "LS1" is still sometimes used, if not confusingly, to describe the entire Gen 3/Gen 4 engine family. L ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Car And Driver
''Car and Driver'' (''CD'' or ''C/D'') is an American automotive enthusiast magazine. In 2006 its total circulation was 1.23 million. It is owned by Hearst Magazines, who purchased prior owner Hachette Filipacchi Media U.S. in 2011. It was founded as ''Sports Cars Illustrated.'' The magazine is based in Ann Arbor, Michigan. History ''Car and Driver'' was founded as ''Sports Cars Illustrated'' in 1955. In its early years, the magazine focused primarily on small, imported sports cars. In 1961, editor Karl Ludvigsen renamed the magazine ''Car and Driver'' to show a more general automotive focus. ''Car and Driver'' once featured Bruce McCall, Jean Shepherd, and Brock Yates as columnists, and P. J. O'Rourke as a frequent contributor. Former editors include William Jeanes and David E. Davis, Jr., the latter of whom led some employees to defect in 1985 to create '' Automobile''. Rather than electing a Car of the Year, ''Car and Driver'' publishes its top ten picks each y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cam-in-block
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A cam-in-block engine is where the camshaft is located in the engine block. Types of cam-in-block engines are: * F-Head Engine * Flathead engine * Overhead valve engine (the only type where the valves are above the combustion chamber) * T-head engine A T-head engine is an early type of internal combustion engine that became obsolete after World War I. It is a sidevalve engine that is distinguished from the much more common L-head by its placement of the valves. The intake valves are on on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pushrod Engine
An overhead valve (OHV) engine, sometimes called a ''pushrod engine'', is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with earlier flathead engines, where the valves were located below the combustion chamber in the engine block. Although an overhead camshaft (OHC) engine also has overhead valves, the common usage of the term "overhead valve engine" is limited to engines where the camshaft is located in the engine block. In these traditional OHV engines, the motion of the camshaft is transferred using pushrods (hence the term "pushrod engine") and rocker arms to operate the valves at the top of the engine. Some early intake-over-exhaust engines used a hybrid design combining elements of both side-valves and overhead valves. History Predecessors The first internal combustion engines were based on steam engines and therefore used slide valves. This was the case for the first Otto engine, which was first succes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dodge Viper
The Dodge Viper is a sports car that was manufactured by Dodge (by SRT for 2013 and 2014), a division of American car manufacturer FCA US LLC from 1992 until 2017, having taken a brief hiatus in 2007 and from 2010 to 2012. Production of the two-seat super car began at New Mack Assembly Plant in 1991 and moved to Conner Avenue Assembly Plant in October 1995. Although Chrysler considered ending production because of serious financial problems, on September 14, 2010, the then chief executive Sergio Marchionne announced and previewed a new model of the Viper for 2012. In 2014, the Viper was named number 10 on the "Most American Cars" list, meaning 75% or more of its parts are manufactured in the U.S. The Viper was eventually discontinued in 2017 after being in production for 26 years. The 0-60 mph time on a Viper varies from around 3.5-seconds to 4.5 seconds. Top speed ranges from 160 mph to over 200 mph, depending on variant and year. Development history The Viper was initiall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Valve Timing
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Displacement
Variable displacement is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi-cylinder engines. Many automobile manufacturers have adopted this technology as of 2005, although the concept has existed for some time prior to this. Theory of operation Cylinder deactivation is used to reduce the fuel consumption and emissions of an internal combustion engine during light-load operation. In typical light-load driving the driver uses only around 30 percent of an engine’s maximum power. In these conditions, the throttle valve is nearly closed, and the engine needs to work to draw air. This causes an inefficiency known as pumping loss. Some large capacity engines need to be throttled so much at light load that the cylinder pressure at top dead centre is approximately half that of a small 4-cylinder engine. Low cylinder pressure results in lower fuel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercedes-Benz 500I Engine
The Mercedes-Benz 500I engine is a highly powerful, turbocharged, 3.4-liter, Indy car racing V-8 engine, designed, developed, and built by Ilmor, in partnership with Mercedes-Benz, specifically to compete in the 1994 Indianapolis 500. The Mercedes-Benz 500I engine was slightly lighter than the Ilmor 265D Indy V8 it replaced in the Penske PC-23, although because of its longer inlets, the 500I had a higher overall centre of gravity, thus changing the overall balance of the car a bit. The development and testing of the 500I engine, at that time called Ilmor 265E, took place in the utmost secrecy because there was a possibility of the turbocharger boost level being changed, or the engine being banned by the Indy 500 sanctioning body. Background Mercedes-Benz 500I Much to the surprise of competitors, media, and fans, Marlboro Team Penske arrived at the Indianapolis Motor Speedway with a brand new, secretly-built 209 cid Mercedes-Benz pushrod engine, which was capable of a rep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1994 Indianapolis 500
The 78th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana on Sunday, May 29, 1994. The race was sanctioned by United States Auto Club (USAC), and was included as race number 4 of 16 of the 1994 PPG IndyCar World Series. For the second year in a row, weather was nary a factor during the month. Only one practice day was lost to rain, and pole day was only partially halted due to scattered showers. Warm, sunny skies greeted race day. Al Unser Jr. won from the pole position, his second Indy 500 victory. Much to the surprise of competitors, media, and fans, Marlboro Team Penske arrived at the Speedway with a brand new, secretly-built 209 in3 (3.42 L) displacement Ilmor Mercedes-Benz pushrod engine, which was capable of nearly . Despite reliability issues with the engine and handling difficulties with the chassis, the three-car Penske team (Unser, Emerson Fittipaldi and Paul Tracy) dominated most of the month, and practically the entire race. While ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chevrolet
Chevrolet ( ), colloquially referred to as Chevy and formally the Chevrolet Motor Division of General Motors Company, is an American automobile division of the American manufacturer General Motors (GM). Louis Chevrolet (1878–1941) and ousted General Motors founder William C. Durant (1861–1947) started the company on November 3, 1911 as the Chevrolet Motor Car Company. Durant used the Chevrolet Motor Car Company to acquire a controlling stake in General Motors with a reverse merger occurring on May 2, 1918, and propelled himself back to the GM presidency. After Durant's second ousting in 1919, Alfred Sloan, with his maxim "a car for every purse and purpose", would pick the Chevrolet brand to become the volume leader in the General Motors family, selling mainstream vehicles to compete with Henry Ford's Model T in 1919 and overtaking Ford as the best-selling car in the United States by 1929 with the Chevrolet International. Chevrolet-branded vehicles are sold in most a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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