Andy G,
Thanks for pointing out the important part that I did forgot to mention.

As an aside, those brilliant engineers in Germany made fantastic aircraft and engines to power them. The mechanical fuel injection system used on the DB series was individually adjustable to ensure correct fuel/air mix to each cylinder. This fuel injection system ensured Me109’s could bunt without an engine cut, unlike the Spits and Hurri’s of the day. However, as Andy G mentions, because the DB’s had fuel injected directly into the inlet ports i.e. after the supercharger, these engines did not benifit from the adiabatic cooling of the charge. Rolls Royce’s Merlins and Griffons, carb’d and fuel injected versions, introduced the fuel into the air prior to compression by the supercharger, thereby enjoying the benifits.

camlobe