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Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability. Ports can be modified for maximum power, minimum fuel consumption, or a ...
The aluminum DOHC cylinder heads have 4 valves per cylinder. All have forged steel connecting rods , one-piece cast crankshaft , iron-coated aluminum pistons and a magnesium intake manifold . Like the M112, a balance shaft is installed in the engine block between the cylinder banks to deal with vibrations in the 90 degree V6 design.
The Volkswagen air-cooled engine is an air-cooled, gasoline-fuelled, boxer engine with four horizontally opposed cast-iron cylinders, cast aluminum alloy cylinder heads and pistons, magnesium-alloy crankcase, and forged steel crankshaft and connecting rods. There are two distinct families/variations of the aircooled engine namely Type 1 and Type 4.
Further improvements (mostly improved intake porting of the heads) were made in 1999 that raised power output to 200 hp (149 kW) and 169 lb⋅ft (229 N⋅m) and were carried over in the 2000 model. The SVT engine was used in the 1998 to 2001 European Ford Mondeo Mk 2 , Ford Cougar and called the ST200, it also appeared in the American Ford ...
For this reason, aluminum is often in engines that operate at higher RPM. Upgraded bearings for the rocker arm's fulcrum are also sometimes used in engines operating at high RPM. Diesel truck engines often use rocker arms made from cast iron (usually ductile), or forged carbon steel .
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