71,744
edits
m (OHV moved to Overhead Valve) |
m (Robot: Automated text replacement (-rocker arm +rocker arm)) |
||
Line 1: | Line 1: | ||
An '''overhead valve''' (OHV) is a type of [[Four stroke|4-stroke]] engine, also called [[pushrod]] engine or I-head engine is a type of piston engine that places the [[camshaft]] in the cylinder block (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine) and uses pushrods or rods to actuate rocker | An '''overhead valve''' (OHV) is a type of [[Four stroke|4-stroke]] engine, also called [[pushrod]] engine or I-head engine is a type of piston engine that places the [[camshaft]] in the cylinder block (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine) and uses pushrods or rods to actuate [[rocker arm]]s above the cylinder head to actuate the valves. Lifters or tappets reside in the engine block between the camshaft and pushrods. | ||
This contrasts with an [[OHC|overhead cam]] design which places the camshaft(s) above the cylinder head and drives the valves directly or through short rocker | This contrasts with an [[OHC|overhead cam]] design which places the camshaft(s) above the cylinder head and drives the valves directly or through short [[rocker arm]]s. In an OHC engine, the camshaft(s) are normally part of the cylinder head assembly, while in an I-head engine the camshaft (rarely more than one) is part of the main engine block assembly. | ||
[[Category:Definitions]] | [[Category:Definitions]] |