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2. Flat engine - Wikipedia

   en.wikipedia.org/wiki/Flat_engine

   A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, whereby each cylinder has two pistons sharing a central combustion chamber.

3. Engine configuration - Wikipedia

   en.wikipedia.org/wiki/Engine_configuration

   Douglas flat-twin motorcycle engine. Flat engines (also known as "horizontally-opposed" engines) have the cylinders arranged in two banks on either side of a single crankshaft. Boxer engines are a subtype of flat engines where opposing pistons move in and out in tandem. Types of flat engines include: Flat-2, commonly called "flat-twin" Flat-4 ...

4. Flat-four engine - Wikipedia

   en.wikipedia.org/wiki/Flat-four_engine

   A flat-four engine, also known as a horizontally opposed-four engine or boxer engine, [1] is a four-cylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. The most common type of flat-four engine is the boxer-four engine , each pair of opposed pistons moves inwards and outwards at the same time.

5. Flat-six engine - Wikipedia

   en.wikipedia.org/wiki/Flat-six_engine

   A boxer-style flat-six engine is able to have perfect primary and secondary balance.As in other six-cylinder engines, the overlapping of the power strokes of the different cylinders (with a firing interval of 120 degrees in a four-stroke engine) reduces the pulsating of the power delivery relative to that of similar engines with fewer cylinders.

6. Engine balance - Wikipedia

   en.wikipedia.org/wiki/Engine_balance

   A 'flat' engine may either be a 180-degree V engine or a 'boxer' engine. A 180-degree V engine as used in the Ferrari 512BB has opposed cylinder pairs whose connecting rods use the same crank throw. Contrary to this, in a 'boxer' engine, as applied in BMW motorcycles, each connecting rod has its own crank throw which is positioned 180 degrees ...

7. Ferrari flat-12 engine - Wikipedia

   en.wikipedia.org/wiki/Ferrari_flat-12_engine

   "Flat" does not specify crankshaft design and therefore can refer to either a non-boxer engine like the Ferrari or a true boxer engine like a Porsche flat-6. Alternatively, some sources prefer to call Ferrari flat-12 engines a "180° V12", referring to the V12-derived crankshaft design and the 180° angle between cylinder banks. [3]: 60 [4]: 8 ...

8. Talk:Flat engine - Wikipedia

   en.wikipedia.org/wiki/Talk:Flat_engine

   Does it mean "180 degree V engines" (i.e. non-boxer type) or does it mean V engines with some angle (e.g. 60 degree or 90 degree)? 4. It seems that the true distinguishing characteristic of boxer vs. non-boxer type of flat engines is the "horizontally-opposed" nature of them. If we can get agreement on this item, we'll be closer to a consensus.

9. Flat-twin engine - Wikipedia

   en.wikipedia.org/wiki/Flat-twin_engine

   Boxer crankshaft configuration. Most flat-twin engines use a boxer configuration for the crankshaft and are therefore called "boxer-twin" engines. In a boxer-twin engine, the 180° crankshaft moves the pistons in phase with each other, therefore the forces generated by one piston are cancelled out by the other, resulting in excellent primary balance.