Difference between revisions of "Ohv"
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| + | [[Image:DOHC-Zylinderkopf-Schnitt.jpg|thumb|300px|A [[cylinder head]] containing two [[overhead camshaft]]s, one above each of the two valves]] | ||
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In [[automotive engineering]], an '''overhead valve''' [[internal combustion engine]] is one in which the entry and exit [[poppet valve|valves]] and ports are contained in the [[cylinder head]]. | In [[automotive engineering]], an '''overhead valve''' [[internal combustion engine]] is one in which the entry and exit [[poppet valve|valves]] and ports are contained in the [[cylinder head]]. | ||
| − | The original overhead valve or '''OHV''' [[piston engine]] was developed by [[David Dunbar Buick]]. It employed [[pushrod]]-actuated valves [[parallel]] to the [[piston]]s and this is still | + | The original overhead valve or '''OHV''' [[piston engine]] was developed by the [[Scottish-American]] [[David Dunbar Buick]]. It employed [[pushrod]]-actuated valves [[parallel (geometry)|parallel]] to the [[piston]]s and this is still in use today. This contrasts with previous designs, which made use of [[Cam-in-block#L-head|side valves]] and [[sleeve valve]]s. |
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| + | Today the technology is widespread, and the term, "OHV", is generally used to differentiate a [[pushrod engine]] from one which uses [[overhead cam]]s, although both types employ overhead valves and so are both OHV engines. | ||
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===See also=== | ===See also=== | ||
| − | * [[ | + | * [[Valvetrain]] |
| − | + | * [[Overhead camshaft]] | |
| + | * [[Cam-in-block]] | ||
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| − | [[Category:Engine | + | [[Category:Engine valves]] |
Latest revision as of 09:59, 27 September 2009
In automotive engineering, an overhead valve internal combustion engine is one in which the entry and exit valves and ports are contained in the cylinder head.
The original overhead valve or OHV piston engine was developed by the Scottish-American David Dunbar Buick. It employed pushrod-actuated valves parallel to the pistons and this is still in use today. This contrasts with previous designs, which made use of side valves and sleeve valves.
Today the technology is widespread, and the term, "OHV", is generally used to differentiate a pushrod engine from one which uses overhead cams, although both types employ overhead valves and so are both OHV engines.