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Encyclopedia > Single overhead cam

Single overhead cam (also SOHC) refers to the internal combustion engine design where one camshaft is located above the valves. SOHC engines are generally (but not always) limited to two valves per cylinder, one for intake and one for exhaust. A colorized automobile engine An internal combustion engine is an engine that is powered by the expansion of hot combustion products of fuel directly acting within an engine. ... The camshaft is an apparatus used in piston engines to operate poppet valves. ... A valve is a mechanical device that regulates the flow of fluids (either gases, fluidised solids, slurries or liquids) by opening, closing, or partially obstructing various passageways. ... An intake is an air intake for an engine. ... The word exhaust can mean:- A verb meaning tire out, as in After the long gallop, his horse was exhausted. ...


History

In America

While modern domestic manufacturers have only recently begun a large-scale implementation of overhead cam technology, it has been used in some domestic production vehicles intermittently at least since the 1960's, when Kaiser-Jeep produced the 230 cid "Tornado" SOHC inline six engine. In the 1970's, both General Motors and Ford produced SOHC inline four engines: the GM 2300 engine and the Ford "Pinto" engine, respectively. In the 1980's and 1990's the trend accelerated. Kaiser Jeep was the result of the merger between Kaiser Industries, an independent automobile manufacturing company based in Willow Run, Michigan and Toledo, Ohio based Willys-Overland Company. ... A cubic inch is the volume of a cube which is one inch long on each edge. ... General Motors Corporation (NYSE: GM), also known as GM, is a United States-based automobile maker with worldwide operations and brands including Buick, Cadillac, Chevrolet, Daewoo, GMC, Holden, Hummer, Opel, Pontiac, Saturn, Saab, and Vauxhall. ... Ford may mean a number of things: A ford is a river crossing. ... The 2300 was a 2. ... The Ford Pinto engine is the unofficial but ubiquitous nickname for a 4 cylinder internal combustion engine built by the Ford Motor Company in Europe. ...


See also


  Results from FactBites:
 
Camshaft (1534 words)
On single and double overhead cam engines, the cams are driven by the crankshaft, via either a belt or chain called the timing belt or timing chain.
Usually, double overhead cams are used on engines with four (or more) valves per cylinder -- a single camshaft simply cannot fit enough cam lobes to actuate all of those valves.
The main reason to use double overhead cams is to allow for more intake and exhaust valves.
Overhead camshaft - Wikipedia, the free encyclopedia (612 words)
A single overhead camshaft cylinder head from a 1987 Honda CRX Si.
Single overhead camshaft is a design in which one camshaft is placed within the cylinder head.
The cams operate the valves directly or by a short rocker as opposed to overhead valve pushrod engines, which have tappets and long pushrods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
  More results at FactBites »


 

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