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This contrasts the earlier overhead valve engine (OHV) and flathead engine configurations, where the camshaft is located down in the engine block. The valves in both OHC and OHV engines are located above the combustion chamber; however an OHV engine requires pushrods and rocker arms to transfer the motion from the camshaft up to the valves ...
Simpler camshaft drive system: OHV engines have a less complex drive system for the camshaft than OHC engines. [16] Most OHC engines drive the camshaft or camshafts using a timing belt, a chain, or multiple chains. These systems require the use of tensioners, which add complexity. In contrast, an OHV engine has the camshaft positioned close to ...
The Vortec 2200 (RPO code L43) is an OHV straight-4 truck engine. This engine is equipped with secondary air injection, and is flex-fuel capable. It is entirely different from the Iron Duke, and was the last North American iteration of the GM 122 engine. The 2200 uses an iron block and aluminum two-valve cylinder head.
A single camshaft located in the engine block uses pushrods and rocker arms to actuate all the valves. OHV engines are typically more compact than equivalent OHC engines, and fewer parts mean cheaper production, but they have largely been replaced by OHC designs, except in some American V8 engines.
OHC engines always have fewer parts when comparing systems with the same number of valves and cylinders (4 cylinder 2 valve OHC engine to 4 cylinder 2 valve OHV engine). Though it is true that some OHC engines do come close to the high moving part count of an OHV engine it is very rare. The Honda SOHC C series V6 engines for example had a ...
Considered advanced by Detroit engineering standards at the time, the Pontiac OHC 6 followed the Jeep Tornado I6 as the second post-World War II domestic-developed and mass-produced overhead cam automobile engine. [6] The Pontiac's single camshaft was supported by journals within the aluminum valve cover; no separate bearing shells were used.
All of Ford's mainstream V8 engines were replaced by the overhead cam Modular family in the 1990s and the company introduced a new large architecture, the Boss family, for 2010. 1920–1932 Lincoln 60 Degree Fork & Blade V8 —(357.8 and 384.8 cu in (5.9 and 6.3 L))
Mazda's strength since the 1960s has been in its line of Inline-4 engines. Beginning with a tiny 358 cc kei car engine, one of the smallest ever made, Mazda continues to this day to be a leading developer of this type of engine. OHV engine – 358 cc–1.2 L OHV I4 (1961–1974) xC engine – 1.0 L–2.0 L SOHC I4 (1965–1983)