What is the injector size on the L67 engines, and how much HP can they support?
The production injector for all L67 engines is calibrated from the factory as a 36 lb/hour (4.6 g/sec) injector. A very rough formula to determine the power level a injector can support is simply to divide the total flowrate of all the injectors (6 in this case) by the BSFC (Brake Specific Fuel Consumption). If we conservatively estimate our BSFC at an inefficient 0.6 lb/hr/HP, six 36 lb/hr injectors will provide 216 lb/hr of total flow, so this indicates they can support up to 360 HP. A more realistic BSFC is 0.5 lb/hr/HP (our engines are a bit more efficient than 0.6!), which indicates our stock injectors can support up to 432 HP! Actual engine dyno testing has shown that the BSFC of our engines is between 0.35 and 0.4, meaning the stock 36 lb/hr (4.6 g/sec) injectors can theoretically support between 540 to 617 HP! As an aside, our GSX engine which dynoed a conservative 309 at the wheels (that’s 370 at the engine taking into account a 20% loss through the transmission) is still usin
