its not about fuel quantity its about fuel quantity vs duration. the 12mm pumps making big numbers on the stand are not compareable to a 13mm. the duration becomes so long that its injecting fuel after the optimal crank angle. so its just creates smoke excessive egts's etc without any additional hp gains. whereas a 13mm will have injected the same amount of fuel in less crank degrees allowing it more burn time and the ability to make more hp.
this becomes increasingly important when you turn more rpm. we would never be able to run 5500 on a 12mm pump the duration is to long.
465cc's did 621 on a single charger with fuel to spare on my street truck with a 12mm at 17mm rack. 600 on a 13mm will produce 1200 hp i doubt a 12mm at 600'ccs will on fuel
this becomes increasingly important when you turn more rpm. we would never be able to run 5500 on a 12mm pump the duration is to long.
465cc's did 621 on a single charger with fuel to spare on my street truck with a 12mm at 17mm rack. 600 on a 13mm will produce 1200 hp i doubt a 12mm at 600'ccs will on fuel