Editing Rolls-Royce Merlin (section)

==Specifications (Merlin 61)==
[[File:RR Merlin labeled.jpg|thumb|alt=A front right view of a Vee twelve aircraft piston engine centred around a large propeller shaft has components labelled by black lines to each component description. Labelled components include the propeller reduction gearbox, exhaust ports, spark plugs and the coolant pump|Rolls-Royce Merlin with components labelled]]
{{pistonspecs
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|ref=''Jane's''.<ref>Bridgman 1998, pp. 280–282.</ref>
|type=12-cylinder, supercharged, liquid-cooled, 60° "Vee", SOHC, piston aircraft engine.
|bore={{convert|5.4|in|mm|1|abbr=on}}
|stroke={{convert|6.0|in|mm|1|abbr=on}}
|displacement={{convert|1649|cid|L|1|abbr=on}}
|length={{convert|88.7|in|cm|1|abbr=on}}
|diameter=
|width={{convert|30.8|in|cm|1|abbr=on}}
|height={{convert|40|in|cm|1|abbr=on}}
|weight={{convert|1640|lb|kg|1|abbr=on}}{{#tag:ref|Plus 2.5% tolerance|group=nb}}
|valvetrain=[[Overhead camshaft]], two intake and two exhaust valves per cylinder, [[sodium]]-cooled [[Poppet valve#Internal combustion engine|exhaust valve stems]].
|supercharger=Two-speed, two-stage. Boost pressure automatically linked to the throttle, coolant-air [[intercooler|aftercooler]] between the second stage and the engine.
|turbocharger=
|fuelsystem=Twin-choke updraught Rolls-Royce/[[SU carburetor|S.U.]] [[carburetor|carburettor]] with automatic mixture control. Twin independent fuel pumps.
|fueltype= 100/130 [[Octane rating|Octane]] [[Avgas|petrol]].
|oilsystem=[[Dry sump]] with one pressure pump and two scavenge pumps.
|coolingsystem=70% water and 30% [[ethylene glycol]] coolant mixture, pressurised. Supercharger intercooler system entirely separate from main cooling system.<ref name="Smith 1942, p. 656"/>
|power=<br/>
::* {{convert|1,290|hp|kW|abbr=on}} at 3,000 rpm at take-off.
::* {{convert|1,565|hp|kW|abbr=on}} at 3,000 rpm at {{convert|12,250|ft|m|abbr=on}}, MS gear){{#tag:ref|MS and FS refer to the supercharger blower speeds: Moderate/Fully Supercharged. Moderate Supercharging referred to low- to medium-altitudes operation, Full Supercharging to medium- to high-altitude operation<ref name=Flightglobal>{{cite web|title=Development of the Aircraft Supercharger|url=http://www.flightglobal.com/pdfarchive/view/1943/1943%20-%202327.html|publisher=Flightglobal Archive|url-status=live|archive-url=https://web.archive.org/web/20141029090513/http://www.flightglobal.com/pdfarchive/view/1943/1943%20-%202327.html|archive-date=29 October 2014}}</ref>|group=nb}}
::* {{convert|1,580|hp|kW|abbr=on}} at 3,000 rpm at {{convert|23,500|ft|m|abbr=on}}, FS gear)
|specpower=0.96 hp/cu&nbsp;in (43.6 kW/L)
|compression=6:1
|fuelcon=Minimum 30 [[Imperial gallon|Imp&nbsp;gal]]/h (136 L/h), maximum 130 Imp gal/h (591 L/h){{#tag:ref|Ref: ''A.P. 1565 I, P & L: Pilot's Notes for Spitfire IX, XI and XVI'' fuel consumption dependent on throttle, mixture and boost settings, plus altitude.|group=nb}}
|specfuelcon=
|oilcon=
|power/weight=0.96 hp/lb (1.58 kW/kg) at maximum power.
|designer=
|reduction_gear=0.42:1
|general_other=
|components_other=
|performance_other=
}}