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The cylinder head was also modified from 8-valve OHV to 16-valve DOHC, an extremely rare configuration at that time. At first the power output was originally 110 PS (81 kW) which was then increased to 130 PS (96 kW) at 8000 rpm. [10]
Other O-series engines, however, cannot run on unleaded without modification of the cylinder head or use of an additive. By 1987, British Leyland (now known as the Rover Group) equipped the O-series with a 16-valve cylinder head for the Rover 800. This 2.0 L unit was known as the M series, and was further reworked into the T series in 1992. The ...
This is also common for motorcycles, and such head/cylinder components are referred to as barrels. Some engines, particularly medium- and large-capacity diesel engines built for industrial, marine, power generation, and heavy traction purposes (large trucks, locomotives, heavy equipment, etc.) have individual cylinder heads for each cylinder ...
The H-series engine has aluminium engine blocks and cylinder heads, timing belt driven heads, water-cooled engine cooling system, equipped with both carburetors (earlier models) and Multi-Point Fuel Injection (later models) and only available in 16-valve SOHC design.
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A cylinder from an air-cooled aviation engine, a Continental C85. Notice the rows of fins on both the steel cylinder barrel and the aluminum cylinder head. The fins provide additional surface area for air to pass over the cylinder and absorb heat. Flat-four aircraft engine
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Group 4 regulations at that time allowed the use of a cylinder head of a "free" design. This engine still used a three-piece cylinder head design with an included valve angle of 46 degrees. In later years motorsport regulations were changed so that the use of four valve heads was only possible when the homologated cars had four valve heads.