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Triumph slant-four engine
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==Technical features== The slant-four's engine block is of cast iron (called ''chrome iron'' in some references). The cylinders are inclined at an angle of 45Β° from vertical.<ref name="valebook"/>{{rp|44β49}} This allowed the engine to be built with the same tooling needed for a V8, and reduced the overall engine height, permitting lower bonnets. The crankshaft ran in five main bearings. The pistons are aluminium with three rings. All slant-fours are [[oversquare]], with the larger capacity versions being even more so, as the increase in displacement came from increasing the bore diameter while holding the stroke length constant. The cylinder head was cast from aluminium alloy. Combustion chambers were wedge-shaped. The [[Overhead camshaft#Single overhead camshaft|single overhead camshaft]] was driven by a single-row {{cvt|3/8|in}} chain. The eight valves, two per cylinder, were inline and were operated on by the camshaft through bucket tappets with shims for adjustment.
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