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An overhead valve engine, abbreviated (OHV) and sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead (or "sidevalve") engines , where the valves were located below the combustion chamber in the engine block .
The engine in fact produced 67 bhp (50 kW) at 3800 rpm. The car shared a number of features with the famed London Taxi, one of which was the built-in hydraulic jacking system operated from a pump located under the bonnet. The Sixteen had a healthy turn of speed for its day with a maximum quoted speed of 75 mph (121 km/h).
The first 12/50s were produced in late 1923 for the 1924 model year. The cars from this first year of production were designated SA and SB. The SA had a 1496 cc 4-cylinder overhead valve engine in a chassis with a wheelbase of 108.5 in (2,756 mm), while the SB had a wheelbase of 112.5 in (2,858 mm).
Alvis manufactured the four-cylinder 1,842 cc pushrod overhead valve engine [6] which was similar to the engine of the Alvis Firebird but was, in fact, a new design. Its 63 hp (47 kW) was enough to propel the car to a top speed of about 80 mph (130 km/h). [ 6 ]
The water-cooled overhead valve engine featured novel advances for an immediate post-war design, which included thin-wall bearings with replaceable shells and loose-fitted wet liners. Displacement varied from 1,850 cc to 2,088 cc (and 2,188 cc in a tractor variant), growing with time.
Cutaway of a dual overhead camshaft engine 1969 AMC V8 overhead valve engine. The rocker cover has been removed, so the pushrods, rocker arms, valve springs, and valves are visible. A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1]
An F-head engine combines features from both overhead-valve and flathead type engines, the inlet valve operating via pushrod and rocker arm and opening downward like an overhead valve engine, while the exhaust valve is offset from the cylinder and opens upward via an integrated pushrod/valve stem directly actuated by the camshaft, much like the ...
The engine was an air-cooled 47° V-twin with overhead valves operated by rocker arms and short pushrods driven by two camshafts mounted high in the engine's timing case. With a bore of 84 mm and stroke of 90 mm, total displacement was 998 cc (60.9 cu in). These measurements would not change throughout the engine's production life.