# Specific output

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{{Short description|Measure of internal combustion engine performance}}
'''Specific output''' is a measure of [internal combustion engine](/source/Reciprocating_engine) performance. It describes the efficiency of an engine in terms of the [brake horsepower](/source/brake_horsepower) it outputs relative to its [displacement](/source/Engine_displacement). The measure enables the comparison of differently sized engines, and is usually expressed as [kilowatt](/source/kilowatt)s or [horsepower](/source/horsepower) per [litre](/source/litre) or per [cubic inch](/source/cubic_inch).<ref>{{cite web|url=http://www.caranddriver.com/features/2012-10best-highest-specific-output-engines-features|title=2012 10Best: Highest-Specific-Output Engines|date=6 December 2011|publisher=|accessdate=10 February 2016}}</ref> On average, [forced induction](/source/forced_induction) engines out-perform [naturally aspirated engine](/source/naturally_aspirated_engine)s by this measure, primarily due to their increased [volumetric efficiency](/source/volumetric_efficiency).<ref>{{cite web|url=http://www.thetruthaboutcars.com/2015/07/average-gas-engine-specific-output-isnt-quite-100-hpl-yet/|title=Average Gas Engine Specific Output Isn't Quite 100 HP/L, Yet|author=Mark Stevenson|date=28 July 2015|work=The Truth About Cars|accessdate=10 February 2016}}</ref>

==See also==
* [Power density](/source/Power_density)
* [List of automotive superlatives](/source/List_of_automotive_superlatives)

==References==
{{reflist}}

Category:Engine technology

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