Overhead Valve - Revision history

TristanT at 03:45, 25 July 2009

2009-07-25T03:45:00Z

← Older revision		Revision as of 03:45, 25 July 2009
Line 23:		Line 23:
	* ''Smaller overall packaging'' - Because of the [[Cam-in-block\|camshaft's location inside the engine block]], pushrods are more compact than an overhead cam engine of comparable displacement. For example, [[Ford]]'s 4.6 L OHC [[Ford Modular engine\|modular]] V8 is larger than the 5.0 L I-head [[Ford Windsor engine\|Windsor]] V8 it replaced. GM's 4.6 L OHC [[Cadillac Northstar engine\|Northstar]] V8 is slightly taller and wider than GM's larger displacement 5.7 to 7.0 L I-head [[GM LS engine\|LS]] V8. The [[Ford Ka]] uses the venerable Kent Crossflow pushrod engine to fit under its low bonnet line.		* ''Smaller overall packaging'' - Because of the [[Cam-in-block\|camshaft's location inside the engine block]], pushrods are more compact than an overhead cam engine of comparable displacement. For example, [[Ford]]'s 4.6 L OHC [[Ford Modular engine\|modular]] V8 is larger than the 5.0 L I-head [[Ford Windsor engine\|Windsor]] V8 it replaced. GM's 4.6 L OHC [[Cadillac Northstar engine\|Northstar]] V8 is slightly taller and wider than GM's larger displacement 5.7 to 7.0 L I-head [[GM LS engine\|LS]] V8. The [[Ford Ka]] uses the venerable Kent Crossflow pushrod engine to fit under its low bonnet line.

	* ''Less complex drive system'' - Pushrod engines have a less complex drive system when compared with [[OHC]] engines. Most [[OHC]] engines drive the [[camshaft]] or [[camshaft]]s using a [[timing belt]], a [[Roller chain\|chain]] or multiple [[Roller chain\|chain]]s. These systems require the use of tensioners which add some complexity to the engine. In addition, failure of the timing belt or chain can sometimes result in the pistons colliding with the open valves, resulting in severe damage to the engine.		* ''Less complex drive system'' - Pushrod engines have a less complex drive system when compared with [[overhead camshaft\|OHC]] engines. Most [[overhead camshaft\|OHC]] engines drive the [[camshaft]] or [[camshaft]]s using a [[timing belt]], a [[Roller chain\|chain]] or multiple [[Roller chain\|chain]]s. These systems require the use of tensioners which add some complexity to the engine. In addition, failure of the timing belt or chain can sometimes result in the pistons colliding with the open valves, resulting in severe damage to the engine.

	==Limitations==		==Limitations==

Red marquis: /* External links */

2008-10-29T11:11:45Z

External links

← Older revision		Revision as of 11:11, 29 October 2008
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	[[Category:engine technology]]		[[Category:engine technology]]
	[[Category:Engine valves]]		[[Category:Engine valves]]
	~~[[Category:Engines]]~~

Red marquis at 06:31, 12 August 2007

2007-08-12T06:31:50Z

← Older revision		Revision as of 06:31, 12 August 2007
Line 5:		Line 5:
	This contrasts with an [[overhead cam]] (OHC) design which places the camshafts above the cylinder head and drives the valves directly or through short rocker arms. In an OHC engine, the camshafts 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.		This contrasts with an [[overhead cam]] (OHC) design which places the camshafts above the cylinder head and drives the valves directly or through short rocker arms. In an OHC engine, the camshafts 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.

	In 1949, [[Oldsmobile]] introduced the [[Oldsmobile V8 engine\|Rocket V8]]. It was the first high-compression I-head design, and is the archetype for most modern pushrod engines. [[General Motors]] is the world's largest pushrod engine producer with engines such as the [[Buick V6 engine#L32 Supercharged\|3800 Series III]] [[Supercharged]] V6 (260 hp, 280 [[lbf·ft]] torque), [[GM LS engine#LS7\|LS7]] [[Chevrolet Corvette]] 7.0 L V8 Engine (505 hp, 475 lbf·ft torque) and [[GM LS engine#LS4\|LS4]] 5.3 L [[Active Fuel Management\|DOD]] V8 (303 hp, 323 lbf·ft torque). Fewer pushrod type engines remain in production, a result of the fact that it has become difficult to achieve competitive engine performance with the configuration. However, in 2002, Chrysler introduced a new pushrod engine: a 5.7L Hemi engine. The new [[Chrysler Hemi engine]] presents advanced features such as [[variable displacement]] technology and has been a popular option with buyers. The Hemi was on the [[Ward's 10 Best Engines]] list for 2003 through 2007.		In 1949, [[Oldsmobile]] introduced the [[Oldsmobile V8 engine\|Rocket V8]]. It was the first high-compression I-head design, and is the archetype for most modern pushrod engines. [[General Motors]] is the world's largest pushrod engine producer with engines such as the [[Buick V6 engine#L32 Supercharged\|3800 Series III]] [[Supercharged]] V6 (260 hp, 280 lbf·ft torque), [[GM LS engine#LS7\|LS7]] [[Chevrolet Corvette]] 7.0 L V8 Engine (505 hp, 475 lbf·ft torque) and [[GM LS engine#LS4\|LS4]] 5.3 L [[Active Fuel Management\|DOD]] V8 (303 hp, 323 lbf·ft torque). Fewer pushrod type engines remain in production, a result of the fact that it has become difficult to achieve competitive engine performance with the configuration. However, in 2002, Chrysler introduced a new pushrod engine: a 5.7L Hemi engine. The new [[Chrysler Hemi engine]] presents advanced features such as [[variable displacement]] technology and has been a popular option with buyers. The Hemi was on the [[Ward's 10 Best Engines]] list for 2003 through 2007.

	==History==		==History==
	[[Image:Pushrod2.PNG\|thumb\|200px\|Components of a pushrod valve actuation system]]		[[Image:Pushrod2.PNG\|thumb\|200px\|Components of a pushrod valve actuation system]]
	In [[automotive engineering]], an '''overhead valve''' [[internal combustion engine]] is one in which the intake and exhaust [[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 intake and exhaust [[poppet valve\|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 employs [[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.		The original overhead valve or '''OHV''' [[piston engine]] was developed by the Scottish-American [[David Dunbar Buick]]. It employs [[pushrod]]-actuated valves 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.

	Nowadays, side-valves have virtually disappeared (except perhaps in lawn-mower engines) and valves are almost all "overhead". However most are now driven more directly by the [[Overhead camshaft\|overhead camshaft]] system and these are designated OHC instead (either [[Overhead_camshaft#Single_overhead_camshaft\|SOHC]] or [[Overhead_camshaft#Dual_overhead_camshaft\|DOHC]]).		Nowadays, side-valves have virtually disappeared (except perhaps in lawn-mower engines) and valves are almost all "overhead". However most are now driven more directly by the [[Overhead camshaft\|overhead camshaft]] system and these are designated OHC instead (either [[Overhead_camshaft#Single_overhead_camshaft\|SOHC]] or [[Overhead_camshaft#Dual_overhead_camshaft\|DOHC]]).
Line 36:		Line 36:
	==1994 Mercedes Indianapolis 500 engine==		==1994 Mercedes Indianapolis 500 engine==

	The [[Indy 500]] race in [[Indianapolis]] each year bears some vestige of its original purpose as a proving ground for automobile manufacturers, in that it once gave an advantage in engine displacement to engines based on stock production engines, as distinct from out-and-out racing engines designed from scratch. One factor in identifying production engines from racing engines was the use of pushrods, rather than the overhead cams used on most modern racing engines; Mercedes-Benz realized before the [[1994]] race that they could very carefully tailor a purpose-built racing engine using pushrods to meet the requirements of the Indy rules and take advantage of the 'production based' loophole but still design it to be state of the racing art in all other ways, without any of the drawbacks of a real production-based engine. They entered this engine in 1994, and, as expected, dominated the race. After the race, the rules were changed in order to reduce the amount of [[Turbocharger#Boost\|boost pressure]] allowed to be supplied by the [[turbocharger]]. The inability of the engine to produce competitive power output after this change caused it to become obsolete after just the one race. Mercedes-Benz knew this beforehand, deciding that the cost of engine development was worth one win at Indianapolis.		The [[Indy 500]] race in [[Indianapolis]] each year bears some vestige of its original purpose as a proving ground for automobile manufacturers, in that it once gave an advantage in engine displacement to engines based on stock production engines, as distinct from out-and-out racing engines designed from scratch. One factor in identifying production engines from racing engines was the use of pushrods, rather than the overhead cams used on most modern racing engines; Mercedes-Benz realized before the 1994 race that they could very carefully tailor a purpose-built racing engine using pushrods to meet the requirements of the Indy rules and take advantage of the 'production based' loophole but still design it to be state of the racing art in all other ways, without any of the drawbacks of a real production-based engine. They entered this engine in 1994, and, as expected, dominated the race. After the race, the rules were changed in order to reduce the amount of [[Turbocharger#Boost\|boost pressure]] allowed to be supplied by the [[turbocharger]]. The inability of the engine to produce competitive power output after this change caused it to become obsolete after just the one race. Mercedes-Benz knew this beforehand, deciding that the cost of engine development was worth one win at Indianapolis.

	==Comparison of engine configurations and types==		==Comparison of engine configurations and types==
Line 74:		Line 74:
	\| V12		\| V12
	\| DOHC		\| DOHC
	\| 2002 [[~~Enzo~~ Ferrari ~~(car)\|~~Enzo ~~Ferrari~~]]		\| 2002 [[Ferrari Enzo]]
	\| 496		\| 496
	\| 660		\| 660

Red marquis: /* External links */

2007-08-12T06:28:20Z

External links

← Older revision		Revision as of 06:28, 12 August 2007
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	[[Category:engine technology]]		[[Category:engine technology]]
	~~[[Category:Motorcycle engines]]~~

	~~[[sv:Stötstångsmotor]]~~

	[[Category:Engine valves]]		[[Category:Engine valves]]
	[[Category:Engines]]		[[Category:Engines]]

Red marquis at 06:27, 12 August 2007

2007-08-12T06:27:44Z

← Older revision		Revision as of 06:27, 12 August 2007
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	[[Image:Overhead Valve V8.jpg\|thumb\|400px]]		[[Image:Overhead Valve V8.jpg\|thumb\|400px]]
	~~[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]~~

	An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.		An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.
Line 9:		Line 8:

	==History==		==History==
			[[Image:Pushrod2.PNG\|thumb\|200px\|Components of a pushrod valve actuation system]]
	In [[automotive engineering]], an '''overhead valve''' [[internal combustion engine]] is one in which the intake and exhaust [[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 intake and exhaust [[poppet valve\|valves]] and ports are contained in the [[cylinder head]].

Line 16:		Line 16:

	Pushrod engines have become less common in recent years, serving primarily as either truck engines or as budget V6 models for General Motors, though Chrysler's HEMI engines are a notable exception. Pushrod engines are nearly extinct among other automakers.		Pushrod engines have become less common in recent years, serving primarily as either truck engines or as budget V6 models for General Motors, though Chrysler's HEMI engines are a notable exception. Pushrod engines are nearly extinct among other automakers.
			{{-}}
	==Advantages==		==Advantages==

Red marquis at 06:26, 12 August 2007

2007-08-12T06:26:45Z

← Older revision		Revision as of 06:26, 12 August 2007
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	[[Image:Overhead Valve V8.jpg\|thumb]]		[[Image:Overhead Valve V8.jpg\|thumb\|400px]]
	[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]		[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]

Red marquis at 06:26, 12 August 2007

2007-08-12T06:26:12Z

← Older revision		Revision as of 06:26, 12 August 2007
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	[[Image:~~pushrod_engine~~.jpg\|thumb]]		[[Image:Overhead Valve V8.jpg\|thumb]]
	[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]		[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]

Red marquis at 06:25, 12 August 2007

2007-08-12T06:25:29Z

← Older revision		Revision as of 06:25, 12 August 2007
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	[[Image:pushrod_engine.jpg\|thumb]]		[[Image:pushrod_engine.jpg\|thumb]]
	[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]		[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]


	An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.		An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.

Red marquis at 06:24, 12 August 2007

2007-08-12T06:24:34Z

← Older revision		Revision as of 06:24, 12 August 2007
Line 1:		Line 1:
			[[Image:pushrod_engine.jpg\|thumb]]
	[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]		[[Image:Pushrod2.PNG\|thumb\|Components of a pushrod valve actuation system]]
	~~[[Image:pushrod_engine.jpg\|thumb\|Picture of an engine block, showing the camshaft, pushrods, and rockers.]]~~

	An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.		An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve\|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.

Red marquis at 06:23, 12 August 2007

2007-08-12T06:23:07Z

New page

[[Image:Pushrod2.PNG|thumb|Components of a pushrod valve actuation system]]
[[Image:pushrod_engine.jpg|thumb|Picture of an engine block, showing the camshaft, pushrods, and rockers.]]

An '''overhead valve (OHV) 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 arms above the [[cylinder head]] to actuate the [[poppet valve|valves]]. Lifters or ''[[tappet]]s'' reside in the engine block between the camshaft and pushrods.

This contrasts with an [[overhead cam]] (OHC) design which places the camshafts above the cylinder head and drives the valves directly or through short rocker arms. In an OHC engine, the camshafts 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.

In 1949, [[Oldsmobile]] introduced the [[Oldsmobile V8 engine|Rocket V8]]. It was the first high-compression I-head design, and is the archetype for most modern pushrod engines. [[General Motors]] is the world's largest pushrod engine producer with engines such as the [[Buick V6 engine#L32 Supercharged|3800 Series III]] [[Supercharged]] V6 (260 hp, 280 [[lbf·ft]] torque), [[GM LS engine#LS7|LS7]] [[Chevrolet Corvette]] 7.0 L V8 Engine (505 hp, 475 lbf·ft torque) and [[GM LS engine#LS4|LS4]] 5.3 L [[Active Fuel Management|DOD]] V8 (303 hp, 323 lbf·ft torque). Fewer pushrod type engines remain in production, a result of the fact that it has become difficult to achieve competitive engine performance with the configuration. However, in 2002, Chrysler introduced a new pushrod engine: a 5.7L Hemi engine. The new [[Chrysler Hemi engine]] presents advanced features such as [[variable displacement]] technology and has been a popular option with buyers. The Hemi was on the [[Ward's 10 Best Engines]] list for 2003 through 2007.

==History==
In [[automotive engineering]], an '''overhead valve''' [[internal combustion engine]] is one in which the intake and exhaust [[poppet valve|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 employs [[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.

Nowadays, side-valves have virtually disappeared (except perhaps in lawn-mower engines) and valves are almost all "overhead". However most are now driven more directly by the [[Overhead camshaft|overhead camshaft]] system and these are designated OHC instead (either [[Overhead_camshaft#Single_overhead_camshaft|SOHC]] or [[Overhead_camshaft#Dual_overhead_camshaft|DOHC]]).

Pushrod engines have become less common in recent years, serving primarily as either truck engines or as budget V6 models for General Motors, though Chrysler's HEMI engines are a notable exception. Pushrod engines are nearly extinct among other automakers.

==Advantages==

In contrast, pushrod engines have specific advantages:

* ''Smaller overall packaging'' - Because of the [[Cam-in-block|camshaft's location inside the engine block]], pushrods are more compact than an overhead cam engine of comparable displacement. For example, [[Ford]]'s 4.6 L OHC [[Ford Modular engine|modular]] V8 is larger than the 5.0 L I-head [[Ford Windsor engine|Windsor]] V8 it replaced. GM's 4.6 L OHC [[Cadillac Northstar engine|Northstar]] V8 is slightly taller and wider than GM's larger displacement 5.7 to 7.0 L I-head [[GM LS engine|LS]] V8. The [[Ford Ka]] uses the venerable Kent Crossflow pushrod engine to fit under its low bonnet line.

* ''Less complex drive system'' - Pushrod engines have a less complex drive system when compared with [[OHC]] engines. Most [[OHC]] engines drive the [[camshaft]] or [[camshaft]]s using a [[timing belt]], a [[Roller chain|chain]] or multiple [[Roller chain|chain]]s. These systems require the use of tensioners which add some complexity to the engine. In addition, failure of the timing belt or chain can sometimes result in the pistons colliding with the open valves, resulting in severe damage to the engine.

==Limitations==

Three specific problems remain with pushrod engines:

* ''Limited engine speeds or [[revolutions per minute|rpm]]'' - Pushrod engines have more reciprocating mass, suffer more easily from valve "float", and exhibit a tendency for the pushrods themselves to flex or snap at high engine speeds. Therefore a pushrod engine cannot revolve ("rev") at engine speeds as high as an OHC design. Modern pushrod engines generally rev to 6,000 rpm: compare this to modern OHC engines that can easily rev from 7,000 rpm in average engines to near 20,000 rpm in [[Formula One]] racing engines. High-rev pushrod engines have also been developed — in 1969, [[Chevrolet]] offered a [[Camaro]] Z28 with a pushrod V8 that could rev to 8,000 rpm and the [[Volvo B18 engine|Volvo B18 and B20]] engines can rev to more than 7,000 rpm. Various pushrod racing engines are capable of reaching from 9,000 in some series to 10,500 rpm in others.

* ''Limited design flexibility'' - The biggest benefit of an OHC design is the use of [[multi-valve|multiple intake and exhaust valves]] and [[variable valve timing]]. Most modern pushrod engines have two valves per cylinder, while many OHC engines use three, four or even five valves per cylinder to achieve greater efficiency and power. Recently, however, GM has begun offering a pushrod V6 with [[VVT]], and [[Cummins]]' [[Cummins B Series engine#ISB|ISB]] is a 4-valve pushrod [[straight-6]]. The GM 3900 was the first mass-produced pushrod engine to feature variable valve timing. The system adjusts both intake and exhaust timing between only two settings, it can not vary the intake and exhaust cams independently. There is even a company called Arao Engineering that developed and patented a 32-valve aluminum cylinder head for various pushrod engines like the small/big block Chevrolet engines and Ford small/big block engines.

==1994 Mercedes Indianapolis 500 engine==

The [[Indy 500]] race in [[Indianapolis]] each year bears some vestige of its original purpose as a proving ground for automobile manufacturers, in that it once gave an advantage in engine displacement to engines based on stock production engines, as distinct from out-and-out racing engines designed from scratch. One factor in identifying production engines from racing engines was the use of pushrods, rather than the overhead cams used on most modern racing engines; Mercedes-Benz realized before the [[1994]] race that they could very carefully tailor a purpose-built racing engine using pushrods to meet the requirements of the Indy rules and take advantage of the 'production based' loophole but still design it to be state of the racing art in all other ways, without any of the drawbacks of a real production-based engine. They entered this engine in 1994, and, as expected, dominated the race. After the race, the rules were changed in order to reduce the amount of [[Turbocharger#Boost|boost pressure]] allowed to be supplied by the [[turbocharger]]. The inability of the engine to produce competitive power output after this change caused it to become obsolete after just the one race. Mercedes-Benz knew this beforehand, deciding that the cost of engine development was worth one win at Indianapolis.

==Comparison of engine configurations and types==

''Comparing engines is not an exact science. This table shows the comparison of some of the most important features when looking at an engine''

<div style='text-align: center;'>

{| class="wikitable"
|-
! Engine name
! Capacity
! Geometry
! Type
! Car
! Engine weight
! Power
! RPM power
! Torque
! RPM torque
! Power/Weight
|-
|
| (liters)
|
|
| (application)
| (lb)
| (HP,SAE)
| (rpm)
| (lbf·ft)
| (rpm)
| (hp/lb)
|-
| F140
| 6.0
| V12
| DOHC
| 2002 [[Enzo Ferrari (car)|Enzo Ferrari]]
| 496
| 660
| 7,800
| 485
| 5,500
| 1.33
|-
| 13B-MSP ([[Renesis#13B-MSP_RENESIS|Renesis]])
| 1.3
| 2-Rotor
| [[Wankel engine|Wankel]]
| 2003 [[Mazda RX-8]]
| 180
| 238
| 8,500
| 159
| 5,500
| 1.32
|-
| M80
| 5.7
| V10
| DOHC
| 2005 [[Porsche Carrera GT]]
| 472
| 605
| 8,000
| 435
| 5,750
| 1.28
|-
| F130
| 4.7
| V12
| DOHC
| 1995 [[Ferrari F50]]
| 437
| 513
| 8,500
| 347
| 6,500
| 1.17
|-
| LS7
| 7.0
| V8
| pushrod
| 2006 [[Chevrolet Corvette#C6 Z06|Corvette Z06]]
| 458
| 505
| 6,300
| 470
| 4,800
| 1.10
|-
| AMG 6.3
| 6.2
| V8
| DOHC
| 2007 [[Mercedes-Benz CLK-Class|Mercedes CLK63 AMG]]
| 439
| 475
| 6,800
| 465
| 5,000
| 1.08
|-
| LS3
| 6.2
| V8
| pushrod
| 2008 [[Chevrolet Corvette C6]]
| 420
| 436
| 5,900
| 428
| 4,400
| 1.02
|-
| S85
| 5.0
| V10
| DOHC
| 2007 [[BMW M5]] & [[BMW M6]]
| 529
| 500
| 7,750
| 383
| 6,100
| 0.94
|-
| SRT-10
| 8.3
| V10
| pushrod
| 2006 [[Dodge_Viper#Third generation ZB (2003-present)|Dodge Viper]]
| 650
| 510
| 5,600
| 535
| 4,600
| 0.79
|-
| S62
| 5.0
| V8
| DOHC
| 2003 [[BMW M5]]
| 527
| 396
| 6,600
| 370
| 3,800
| 0.75
|}
</div>

''Comparison of [[naturally-aspirated engine]]s for race and road legal track day cars''

<div style='text-align: center;'>

{| class="wikitable"
|-
! Engine name
! Capacity
! Geometry
! Type
! Car
! Engine weight
! Power
! RPM power
! Torque
! RPM torque
! Power/Weight
! Reference
|-
|
| (liters)
|
|
| (application)
| (lb)
| (HP)
| (rpm)
| (lbf·ft)
| (rpm)
| (hp/lb)
|
|-
| [[BMW]] P84/5
| 3.0
| V10
| DOHC
| 2005 [[Williams FW27]] [[Formula One|F1]]
| 203
| 925
| 19,000
| NA
| NA
| 4.56
| [http://www.allf1.info/engines/bmw.php]
|-
| [[Ferrari]] Tipo 052
| 3.0
| V10
| DOHC
| 2003 [[Ferrari F2003-GA]] [[Formula One|F1]]
| 203
| 920
| 19,500
| NA
| NA
| 4.53
| [http://www.allf1.info/engines/ferrari.php]
|-
| Powertec RPB V8
| 2.8
| V8
| DOHC
| [[Radical Motorsport|Radical]] SR9
| 194
| 450
| NA
| 250
| NA
| 2.32
| [http://www.powertecracing.com/pdf_downloads/v8_phase3.pdf]
|-
| Motopower RST-V8
| 2.0
| V8
| DOHC
| Various
| 163
| 340
| 10,250
| 190
| 7,000- 7,800
| 2.09
| [http://www.rst-v8.co.uk/]
|-
| [[Powertec RPA|Powertec RPA V8]]
| 2.6
| V8
| DOHC
| [[Radical Motorsport|Radical]] SR8
| 194
| 380
| NA
| 215
| NA
| 1.96
| [http://www.powertecracing.com/pdf_downloads/v8_phase3.pdf]
|-
|}
</div>

===See also===
* [[Valvetrain]]
* [[Overhead camshaft]]
* [[Cam-in-block]]

==External links==
*[http://www.samarins.com/glossary/dohc.html Pushrod (OHV), SOHC and DOHC engine animated diagrams]
*[http://media.gm.com/us/powertrain/en/product_services/2007/HPT%20Library/Gen%20IV/Gen%20IV%20Car/2007_LS7.pdf LS7 torque and power by rpm chart]
*[http://www.web-cars.com/enzo/motor.html Ferrari Enzo: The Engine]

[[Category:engine technology]]
[[Category:Motorcycle engines]]

[[sv:Stötstångsmotor]]

[[Category:Engine valves]]
[[Category:Engines]]