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A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
A 1967 redesign gave it a cross-flow type cylinder head, hence the Kent's alternative name Ford Crossflow. It went on to power the smaller-engined versions of the Ford Cortina and Ford Capri, the first and second editions of the European Escort as well as the North American Ford Pinto (1971, 1972 and 1973 only).
The reverse-flow head still enjoys some popularity among enthusiasts including Leyland Mini, Chrysler Slant-6, Holden and Ford Inline 6 fans. In fact some Australian Ford enthusiasts consider the 250 2V reverse-flow head to be superior to the Honda designed [citation needed] cross-flow head that replaced it.
Cross flow scavenging with a deflector piston. Crossflow cylinder heads are used by most modern 4-stroke engines, whereby the intake ports are located on one side of the combustion chamber and the exhaust ports are on the other side.
The crossflow cylinder heads are made from a cast iron alloy, and the five-bearing camshaft is constructed from a case-hardened steel alloy. Although the engine is often described as a twinned Volvo B18 four-cylinder, only some components of the valve train are interchangeable between the two engines.
The first generation Ecotec engines are belt-driven 16-valve DOHC engines, with cast-iron cylinder blocks and aluminum cross-flow cylinder heads. They feature sodium-filled exhaust valves , a cast steel crankshaft , and a spheroidal graphite flywheel .
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