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...gine''' is a [[piston engine]] made up of two separate [[straight engine]] engines (complete with separate crankshafts) joined by [[gear]]s. ...interest in this design is its ability to share common parts with Straight engines.

...engines with more than 12 cylinders, their compact size being useful as [[aircraft engine]]s where their small size allows for better [[aerodynamics]] - see [ ...ier|Rapier]], [[Napier Dagger|Dagger]] and [[Napier Sabre|Sabre]] airplane engines. Unlike the BRM and the Lycoming, the Sabre eventually matured into a super

[[Image:Opposed_piston_engine_1.jpg|thumb|300px|Fairbanks-Morse opposed piston [[diesel engine]]s on the [[submarine]] ''[[USS Pampanito]]''.]] ...the Opposed Piston or OP designs can use 1 crankshaft like the Doxfordship engines [http://www.oldengine.org/members/diesel/Marine/doxford.htm]

...omentum. Flat engines with four or fewer cylinders are most commonly boxer engines. ...] have favored such engines and it is a common configuration for smaller [[aircraft engine]]s such as made by [[Lycoming]] or [[Continental Motors|Continental]

...engines with more than 12 cylinders, their compact size being useful as [[aircraft engine]]s where their small size allows for better [[aerodynamics]] - see [ ===Aircraft engines===

[[Image:Rotary_Piston_Engine_8b03590r.jpg|right|thumb|280px|A radial piston engine from [[Continental engine]] is torn down after testing, 1944]] ...craft]] engines before being superseded by [[turboshaft]] and [[turbojet]] engines.

...] for other uses of this term, and [[rotary engine]] for the World War I [[aircraft engine]]s by that name.'' ...'rotary engine''' is an [[internal combustion engine]] that does not use [[piston]]s in the way a [[reciprocating engine]] does, but instead uses one or more

...otorbike]]s. It is this W3 engine which also powered the Blériot XI, the [[aircraft]] used by [[Louis Blériot]] when on the 25th of July, 1909, he made the fi The [[1917]], [[Napier Lion]] aircraft had a first [[W12 engine]].

...prove [[engine vibration]] characteristics. X-engines were often [[coupled engines]] derived from existing powerplants. ...ns rather than their advantages. Overheating was a perpetual problem for X engines, and a major reason for the failure of the type.

[[Image:ULPower UL260i.jpg|thumb|[[ULPower UL260i|UL260i]] [[Flat-4]] aircraft engine]] [[Image:Boxer engine cutaway.jpg|thumb|A cutaway of an aircraft boxer engine.]]

...an [[engine]] which translates [[reciprocate|reciprocating]] [[linear]] [[piston]] motion into rotation. It typically connects to a [[flywheel]], to reduce ...he [[cylinder bore]]. In production [[V engine|V]] or [[flat engine|flat]] engines, neighboring connecting rods attach side by side to the same crank throw, s

...fewer [[cylinder head|cylinder heads]] and [[camshaft|camshafts]]. Inline engines are also much smaller in volume than designs like the [[radial engine|radia ...''GM Atlas engine'' family includes straight-4, straight-5, and straight-6 engines.

This article is about a type of piston engine. For internal combustion engines which do not use pistons, see [[pistonless rotary engine]] and [[Wankel eng ...was an early type of [[internal-combustion engine|internal combustion]] [[aircraft engine]], used mostly in the years shortly before and during [[World War I]

...urbocharged]] nor [[supercharged]]. Most [[automobile]] gasoline (petrol) engines are naturally-aspirated, though turbochargers and superchargers have enjoye ...high-performance NA engines that benefit from higher [[internal combustion engines|compression]].

...at has the [[poppet valve|valves]] placed in the engine block beside the [[piston]], instead of in the [[cylinder head]], as in an overhead valve or [[OHV]] ...t's said that such an engine has poorer "breathing". In the early days all engines had poor combustion anyway, so this was a minor concern given the benefits

...wo banks of three cylinders on each side of a central [[crankcase]]. The [[piston]]s are mounted to the [[crankshaft]] such that opposing pistons move back a ...h makes it more suitable for luxury sports cars, cruising motorcycles, and aircraft than ordinary passenger cars.

...& Son]], and the locomotives produced by [[English Electric]] using these engines, including their [[British Rail DP1|demonstrator locomotive named ''DELTIC' Until this time, diesel engines had poor [[power-to-weight ratio]] and low speed. Before the war, Napier ha

[[Image:L V VR6 engines.png|thumb|200px|right|Three types of engine: a — straight engine, b& ...configuration|configuration]] for an [[internal combustion engine]]. The [[piston]]s are aligned so that they appear to be in a V when viewed along the line

...& Son]], and the locomotives produced by [[English Electric]] using these engines, including their [[British Rail DP1|demonstrator locomotive named ''DELTIC' ...ft. Hitherto in the [[Royal Navy]], such boats had been driven by gasoline engines but this fuel is obviously highly flammable and made them very vulnerable t

...delivery. In a large, heavy-duty engine, a V12 can run slower than smaller engines, prolonging engine life. ...craft to make a [[transatlantic]] flight, the [[NC-4]], had a set of 4 V12 engines.

...otorbike]]s. It is this W3 engine which also powered the Blériot XI, the [[aircraft]] used by [[Louis Blériot]] when on the 25th of July, 1909, he made the fi The 1917 Napier Lion aircraft had a first [[W12]] engine.

...[[Willys-Knight]] car and light truck, and saw substantial use in 1940s [[aircraft engine]]s, but subsequently fell from use due to advances in poppet-valve t ...does the piston and the valve no good at all. Even in "non-interference" engines, at some point the valve head can simply part from the valve stem due to th

...] for other uses of this term, and [[rotary engine]] for the World War I [[aircraft engine]]s by that name.'' ...'rotary engine''' is an [[internal combustion engine]] that does not use [[piston]]s in the way a [[reciprocating engine]] does, but instead uses one or more

...|English]] between two meanings of the word "engineer": 'those who operate engines' and 'those who design and construct new items'. ==History of engines==

...|English]] between two meanings of the word "engineer": 'those who operate engines' and 'those who design and construct new items'. ==History of engines==

...sion cam-in-block design, and is the [[archetype]] for most modern pushrod engines. Generally L-head engines use a small chamber on one side of the cylinder to carry the valves. This h

...h are permitted to expand. The expanding gases are used to directly move a piston, turbine blades, rotor(s), or the [[engine]] itself thus doing useful work. Internal combustion engines can be powered by any [[fuel]] that can be combined with an "[[oxidizer]]"

...s smooth high-rpm power from a compact, lightweight engine; however Wankel engines are criticized for poor [[fuel efficiency]] and [[emissions standard|exhaus ...[Mercedes-Benz C111|C111]] concept car, only [[Mazda]] has produced Wankel engines in large numbers. As of [[2005]], the engine is only available in the [[Maz

...ull away immediately, or else risk a broken wrist, or worse. Moreover, as engines evolved, they became larger and compression ratios increased, making hand c ...e this design weighs less, it has also been adapted to some light aircraft engines, where minimizing weight is very important.

*Piston ...e first person to patent a forced-induction system for internal combustion engines. His first superchargers were based on a twin-rotor air-pump design first p

...ber, which are permitted to expand. The expanding gases are used to move a piston, turbine blades, rotor, or the engine itself. ...ons are called oil engines. However, gasoline engines are often called gas engines for short. The only limitations are that the fuel must be easily transporta

...g for nearly 196 of the 200 laps, his [[Mercedes-Benz|Mercedes]] cracked a piston and only 2 laps remaining, he and his mechanic had to push the car across t ...ring Company in Detroit to build race cars and engines for automobiles and aircraft.

...cient to ignite the fuel spontaneously. All conventional petrol (gasoline) engines, by contrast, require an ignition system. The ignition system is usually sw The earliest petrol engines used a very crude ignition system. This often took the form of a copper or

The '''cam-in-block''' [[valvetrain]] layout of [[piston engine]]s is one where the [[camshaft]] is placed within the [[cylinder blo ...Motors, Ford, DaimlerChrysler, and Cummins produce cam-in-block or pushrod engines in any large numbers, although GM in particular has several OHV engine fami

...sion cam-in-block design, and is the [[archetype]] for most modern pushrod engines. Generally L-head engines use a small chamber on one side of the cylinder to carry the valves. This h

[[Image:Aero4G11.jpg|thumb|250px|The Liberty V8 aircraft engine clearly shows the configuration]] The V8 is a very common configuration for large [[automobile]] engines. V8 engines are rarely less than 4 litres in displacement and in automobile use have go

==How diesel engines work== ...to heat up rapidly, which increases its pressure, which in turn forces the piston downwards. The [[connecting rod]] transmits this motion to the [[crankshaf

P.68B - Two 150kW (200hp) Lycoming IO360A1B fuel injected flat four piston engines driving two blade constant speed propellers. P.68TC - Two 155kW (210hp) tur ...first flew on May 25 1970 and demonstrated performance similar to that of aircraft in its class (such as the Seneca) which had retractable undercarriage, but

...arate working fluid, which then in turn does work, for example by moving a piston. ...s, most [[rocket]]s and many [[gas turbine]]s are also internal combustion engines.

...[[Engine knocking|knock]], a condition which is potentially destructive to engines, and "judges" it to be the result of the ignition timing being too early in ...k" requirement of the moment. In this case the knock/ping results from the piston not being able to move downward as fast as the flame front is expanding.

..., requiring a mixture of oil with the gasoline in order to lubricate the [[piston]] and [[cylinder]]. The mixture of oil in the fuel produced high amounts of ...our-stroke cycle|four stroke]] and cleaner [[two-stroke cycle|two stroke]] engines. First came the ET2 (50 cc) and ET4 (50-124cc). Next came the larger 200 c

...]es. In a [[piston engine]], this is the volume that is ''swept'' as the [[piston]]s are moved from ''[[top dead centre]]'' to ''bottom dead centre''. ==Standard engines==

A '''hydrogen vehicle''' is a [[vehicle]], such as an [[automobile]] or [[aircraft]], which uses [[hydrogen]] as its primary source of [[power (physics)|power * In combustion, the hydrogen is "burned" in engines in fundamentally the same method as traditional gasoline cars.

...or an [[internal-combustion engine]]. Carburetors are still found in small engines and in older or specialized [[automobile]]s such as those designed for [[st ...flat airplane engines still have the updraft carburetor, as do many small engines, as on [[lawnmower]]s and so on.

...re) | inch]]³; utililzzato until then, to be used more varied: on vessels, aircraft, even by firemen to Operate large pumps. It is lightweight and compact with ...riguardarono l '[[crankshaft]] which was replaced with one in [[steel]], [[piston (mechanical) | pistons]] the [[camshaft | camshafts]], the pump of oil and

...[[Taiwan|Taiwanese]] manufactured scooters; [[India|Indian]] light vehicle engines; [[United Kingdom|British]] fashion clothing; and [[China|Chinese]] produce ...es or skirts made riding a motorcycle a challenge. The front fork, like an aircraft's landing gear, allowed for easy wheel changing. The internal mesh transmi

For [[gasoline]] engines, [[carburetor]]s were the predominant method to meter fuel before the wides ...trend continues, it is conceivable that virtually all internal combustion engines, including garden equipment and snow throwers, will eventually use EFI.

...roductive capacity and tecnology, in other fields, like marine, industrial engines and a collaboration with [[Isotta Fraschini]] . ...[[Piaggio]] pistons engine and the first one of the first [[Italian]] jet aircraft, the 1940 Caproni Campini CC2, that flew the first time during a 1941 fligh

...e edge of the track close to the finish line for hours, then restart their engines and crawl across the line to be listed amongst the finishers. However, this ...At the dropping of the French tricolor, the drivers would then start their engines and drive away. However, in 1971 this method would be done away with altoge

...lled '''Hybrid-electric vehicle (HEV)''' which use [[internal combustion]] engines and [[electric battery|electric batteries]] to power [[electric motor]]s. M ...ids where a small petrol engine powered a compressor. Several types of air engines also increased the range between fill-ups with up to 60% by absorbing ambie