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...penings compared to the volume of the cylinder and streamlining the ports. Engines with higher volumetric efficiency will generally be able to run at higher R ...g air-fuel mixture back to the cylinder. A more modern technique, variable valve timing, attempts to address changes in volumetric efficiency with changes i

The '''slide valve''' is a rectilinear valve used to control the admission of steam into, and emission of exhaust from, ...ide valves were gradually superseded by [[piston valves]], particularly in engines using superheated steam. There were two reasons for this:

...in 1919 started produced cars using [[Knight Engine|Knight]] sleeve valve engines at Issy-les-Moulineaux, an industrial suburb to the South West of Paris. Re ''Voisin engine layouts used:(Knight engines)''

...868-1940), that used [[sleeve valve]]s instead of the more common [[poppet valve]] construction. ...s - this also made the Knight engine more quiet than standard engines. The engines also allowed for Hemi-spherical chambers. Knight received backing from L.B

For many [[automobile]] engines, the term '''block''' is interchangeable with engine in this context, for e ...features and consequent performance characteristics are also regarded as V engines, purely because of their shape. Similarly, the Volkswagen [[VR6 engine]] is

...o been tried, so far unsuccessfully, except with low-speed "oilless" steam engines.[http://www.www.spilling.de/uk/index-steamengines.htm.com] A cylinder's dis ...for compressional sealing and one to seal the [[motor oil|oil]] (In steam engines only compressional sealing rings are used of which there can be from two to

...Viewed head-on, this would appear as an X. X engines were often [[coupled engines]] derived from existing powerplants. Most examples of X engines are from the World War II era, and were designed for large military aircraf

...system which, after extensive development, saw substantial use in aircraft engines of the 1940s, such as the Napier Sabre and Bristol Hercules and Centaurus, ...on engine where it rotates and/or slides, ports (holes) in the side of the valve(s) aligning with the cylinder's inlet and exhaust ports at the appropriate

...of WW1, offered a wide range of cars. During the war Itala built aeroplane engines but made a loss producing them.

...'s, a 1997cc sports model was marketed and in some models [[sleeve valve]] engines were used.

.... McCollum]] began production; the entire range featured [[Burt-McCollum]] engines by 1914. ...tric starter but few were sold. In 1922 it was joined by a 1½-litre sleeve valve model and in 1926 by the 12/40 sports.

[[Image:Overhead Valve V8.jpg|thumb|400px]] ...to actuate rocker arms above the [[cylinder head]] to actuate the [[poppet valve|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the

Napiers expanded into marine engines as well, their 1905 boat ''Napier II'' setting the world water speed record ...est-seller for the company, and they eventually dropped all the other aero-engines. The Lion went on to be used in the 1920s to win the [[World Land Speed Rec

...during the 1930s, before the introduction of modern-type opposed-cylinder engines. ...te which is concentric with the crankshaft. A few engines utilize [[sleeve valve]]s instead.

...and design, extending to the construction and testing of several prototype engines from as early as 1943. ...XJ" began prototype testing and underwent many changes as its head, ports, valve gear and camshaft drives were perfected.

...]]s and many [[gas turbine]]s are also very definitely internal combustion engines. ...ke. The most significant distinction between '''modern internal combustion engines''' and the early designs is the use of compression and in particular of in-

...esellschaft'' (DMG). Its purpose was the construction of small, high speed engines based on the same [[stationary engine]] technology. ...etor]], and so on. The company would manufacture small internal combustion engines suitable for use on land, sea, and in the air (the basis for a symbol Daiml

In 1913 Willys acquired a license to build [[Knight Engine]]s (sleeve-valve) engine which it used in cars bearing the [[Willys-Knight]] nameplate. In t ...ustries decided to leave the automobile business. After the sale, AMC used engines it had developed for its other cars in the Jeep products to improve perform

...any acquired a [[Knight Engine]] licence in 1908 to build [[sleeve valve]] engines for its automobiles. ...er built in 1914 ("Little Willie" and "Big Willie"), a scout army vehicle, engines used in aeroplanes, ambulances, trucks, and double-decker buses. In late 19

==[[internal combustion engine|Engines]]== ...vert|368|kW|PS bhp|0|abbr=on}} [[DIN]] - [[list of Volkswagen Group diesel engines#V12|Audi V12 TDI]] in the [[Audi Q7]]<ref name=AW-Q7>{{cite web|title=The W