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In a piston engine, the cylinder head sits above the cylinders, [1] forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins .
Difference between two flat 6 cylinder engines: 180° V on the left, boxer on the right. The advantages of flat engines are a short length, low centre of mass and suitability for air cooling (due to the well-exposed, large-surface-area cylinders and cylinder heads, and their short length).
GM's German subsidiary, Opel, relies on a range of three-, four- and six-cylinder gasoline and diesel engines. A survey [citation needed] of their range shows a reliance on petrol and diesel four-cylinders, and in 2014, there was only one 3-cylinder engine and one 6 cylinder engine in service in Opel's passenger car range.
This design also relocated the water outlet from the front of the heads to the top center of the heads. These, designated V8-78, were offered with standard 6.2:1 compression aluminum or 7.5:1 compression iron cylinder heads , rated at 85 hp (63 kW) and 144 lb⋅ft (195 N⋅m) (aluminum) or 94 hp (70 kW) (iron). [ 19 ]
These engines have a cast-iron engine block with cast aluminium alloy cylinder heads. The cylinder heads contain four valves per cylinder actuated by dual overhead camshafts which are driven by a timing belt. These engines, however, differed from many modern V6 engines in that it has a 54-degree cylinder bank angle as opposed to the more ...
Some engines have used a V-angle of 180 degrees (the same angle as a flat engine), such as several Ferrari V12 engines. [7] [8] At the other end of the scale, the 1922-1976 Lancia V4 engine and the 1991–present Volkswagen VR6 engine use V-angles as small as 10 degrees, along with a single cylinder head used by both banks of cylinders.
These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons. They were called Polyspheric or Poly engines, because they featured polyspherical-shaped (meaning "more than one sphere") combustion chambers. These combustion chambers were ...
The Type 908 was not based on the Type 771, but instead the Type 916 flat-six racing six-cylinder engine with two additional cylinders. [18] Porsche also installed Type 908 engines into two Porsche 914/8 mid-engined road cars. The first of these was a concept study built by the head of the racing department, and the second was built as a 60th ...
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