Difference between revisions of "Flat-4"

Revision as of 15:29, 18 January 2006

A flat-4 is a four cylinder internal combustion engine where the cylinders are arranged in a flat configuration. This is not a common configuration, but some brands of automobile have favoured such engines and it is a common configuration for smaller aircraft engines such as made by Lycoming. Although they are considered to be superior to

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-A '''flat-4''' is a four cylinder [[internal combustion engine]] where the cylinders are arranged in a [[flat engine|flat configuration]].  This is not a common configuration, but some brands of [[automobile]] have favoured such engines and it is a common configuration for smaller [[aircraft engine]]s such as made by [[Lycoming]].  Although they are considered to be superior to "inline-fours" in terms of refinement and vibration, they have largely fallen out of favor because their larger overall dimensions are not suited to modern small cars. The shape of the engine suits it better for [[rear engine]] designs, where the low [[center of gravity]] is an advantage; in [[front engine]] designs the width interferes with the ability of the front wheels to steer.
+A '''flat-4''' is a four cylinder [[internal combustion engine]] where the cylinders are arranged in a [[flat engine|flat configuration]].  This is not a common configuration, but some brands of [[automobile]] have favoured such engines and it is a common configuration for smaller [[aircraft engine]]s such as made by [[Lycoming]].  Although they are considered to be superior to
-The open and exposed design of the engine allows air cooling over water cooling, and in air cooled applications fins are often seen machined into the external cylinder block walls.
-==Automobile use==
-[[Image:1955 Porsche 550 Spyder engine.jpg|right|thumb|250px|Flat-4 engine in a 1955 [[Porsche 550 Spyder]]]]
-[[Volkswagen]] used air-cooled flat-4s extensively in their early days, in the [[VW Beetle]] and most early VW designs.  [[Porsche]] also used the VW engine in the early [[Porsche 356]]. This engine was replaced by a Porsche designed flat-4 in the late 356s and the [[Porsche 912|912]]. The [[VW-Porsche 914|914]] that replaced the 912 was built in partnership with VW using a VW engine.  VW used a water-cooled flat-4 in the [[Volkswagen Type 2 (T3)|T3]] until 1991.
-[[Citroën]] used an air-cooled flat-4 on the [[Citroën GS|GS]] and [[Citroën GS|GSA]].
-[[Alfa Romeo]] introduced a water cooled flat-4 on the [[Alfa Romeo Alfasud]]. That engine was later used on the [[Alfa Romeo Arna]], the [[Alfa Romeo 33]], the [[Alfa Romeo Sprint]], the [[Alfa Romeo 145|Alfa Romeo 145/146]].
-[[Lancia]] also used a water cooled flat-4 on the high-end [[Lancia Gamma]].
-[[Subaru]] produces water-cooled front mounted flat-4 engines marketed as H-4, by which they mean '''H'''orizontal rather than the H cross-section normally meant by [[H engine]].
-==Motorcycle use==
-[[Honda]] introduced water cooled flat-4 on the [[Honda Gold Wing|Honda 1000 Gold Wing]].
-==Aircraft use==
-[[Lycoming]] developed a very successful series of flat-4 [[aircraft engine]]s, as used in many [[Cessna]] aircraft.  Similar engines are produced by [[Continental Motors]].
-{{auto-part-stub}}
-[[Category:Piston engine configurations]]

Difference between revisions of "Flat-4"

Revision as of 15:29, 18 January 2006

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