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It doesnt quite work that way on a supercharged engine, its not about fuel, compression ratio or capacity though bigger is often better. Its all about how much Air you can move into and out of the engine and thats down to the air compressor and the intercooler.
Take a look at BMWs M12 Formula 1 engine of the 80s, it was a 1500cc 4 cylinder engine with an Iron block from a saloon car that ended up producing 1,400 hp in practice trim and 1,000 hp in race trim with the boost wound back to save fuel. The Turbo just got bigger and bigger and the engine became almost a gas generator bolted to a Turbine. If BMW had kept on strengthening the engine (it was Iron because Aluminium technology couldnt cope) and making the Turbo bigger and the radiators bigger its mind boggling to imagine what power they could have achieved if the FIA hadnt changed the regulations to try and slow the cars down.
Superchargers (mechanically driven or otherwise) add compression and increase mass flow, but are only ONE of the factors contributing to that. The bare (normally aspirated) engine will induce air into the manifold through the vacuum created by the cylinders themselves, and larger displacement and higher RPM mean larger volumes of air being drawn in (and of course, superchargers of similar mass flow will provide lower pressure to a large displacement engine than a small one).It doesnt quite work that way on a supercharged engine, its not about fuel, compression ratio or capacity though bigger is often better. Its all about how much Air you can move into and out of the engine and thats down to the air compressor and the intercooler.
The only real "apples-toapples) comparison in engines is using Mean Effective Pressure, and thsi shows them all to be VERY close to one another, as I expected before I started. For reference, I used the model that came up in Wiki for the numbers, but chose the Merlin XX since I had access to all. The merlin starts to look better up high with the 2-stage units, but not at takeoff, which is where these come from.
I can say for DB60x series only - without comparison to Merlin.But, not because of fuel injection, but because of notably higher compression ratio?