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I couldn't find one but did it ever exist? Would adding fuel injection have improved combat effectiveness or fuel efficiency?

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    $\begingroup$ What do you mean "how would it work"? Why would it work different than any other fuel injected motor? These hypothetical questions are difficult to answer. $\endgroup$ – Ron Beyer Dec 6 '17 at 15:34
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Yes there was. A Spitfire which was converted by Daimler Benz engineers to use a DB 605 engine. See the following links:

https://www.klassiker-der-luftfahrt.de/geschichte/flugzeuge/daimler-benz-versuch-die-daimler-spitfire-die-db-spitfire-zeigt-gute-flugeigenschaften/615458?seite=2

https://defenceoftherealm.wordpress.com/2014/11/17/the-franken-spitfire/

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  • $\begingroup$ Both links are dead; this answer would be improved with a little more detail (e.g. when and where) $\endgroup$ – pericynthion Sep 9 '19 at 17:02
  • $\begingroup$ The links have been edited to point to the archive.org saved copies of the web pages. $\endgroup$ – rclocher3 Sep 9 '19 at 18:38
  • $\begingroup$ The Hispano HA-1112 featured a Merlin engine, Hamilton Standard 3 blade, or Rotol 4 bladed propeller on a Me-109 frame. These flew until the 1960s. $\endgroup$ – Robert DiGiovanni Sep 9 '19 at 19:08
  • $\begingroup$ Updated links are nice, however, including some quotes from the links to support the answer would be even better in case they ever go kaput again. @RobertDiGiovanni, forgive my ignorance, what does that have to do with a fuel-injected Spitfire? $\endgroup$ – FreeMan Sep 10 '19 at 18:13
  • $\begingroup$ It's for aviators who know what good is. $\endgroup$ – Robert DiGiovanni Sep 10 '19 at 18:41
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I couldn't find one but did it ever exist?

I do not think so (at least not off the assembly line) the RR Merlin Engines were Carb'ed. The Griffon powered planes were also carb'ed however they used an injection carb which is a bit different than a float style carb but not full on fuel injection.


Would adding fuel injection have improved combat effectiveness or fuel efficiency?

Yes, it would have allowed sustained G maneuvers which are not possible in a carbureted plane as the float would fall causing fuel to enter the carb unrestricted.

As per wikipedia...

However, the Merlin's float controlled carburettor meant that both Spitfires and Hurricanes were unable to pitch nose down into a steep dive.

This was later remedied by installing a small plate over the float to prevent starvation.

...original production variants of the Merlin used an SU manufactured carburettor in which the fuel flow was metered through a float. In most circumstances this proved to be sufficient but during the air battles over Dunkirk and during the Battle of Britain it was found that whenever the Merlin was subjected to negative "g" forces, such as a quick "bunt" into a dive, the engine would briefly lose power through petrol starvation...

...The remedy, invented by Beatrice "Tilly" Shilling, was to fit a metal diaphragm with a hole in it, across the float chambers. It partly cured the problem of fuel starvation in a dive. The device was commonly referred to as 'Miss Shilling's Orifice'....

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  • $\begingroup$ And then .... the Bendix-Stromberg Pressure Carburettor, circa 1940. $\endgroup$ – Robert DiGiovanni Sep 9 '19 at 3:01

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