GAMInjector® & turboGAMInjector® Fuel Injectors

GAMInjector® fuel injectors and TurboGAMInjector® fuel injectors are fuel injection nozzles designed to deliver specific amounts of fuel to each individual cylinder that will compensate for the fuel/air imbalance inherent in the fundamental design of the engine fuel/air systems.

Each GAMInjector® fuel injector is carefully calibrated to much tighter tolerances than standard fuel injectors available for your engine. The award winning GAMInjector® fuel injectors alter the fuel/air ratio in each cylinder so that each cylinder operates with a much more nearly uniform fuel/air ratio than occurs with any standard factory set of injectors. You will see the difference on your engine monitor with the very first flight!

“Flying The Injected Engine”


For many years, pilots and mechanics with a good understanding of the operation of internal combustion engines have known that the fuel/air distribution in our aircraft piston engines has been less than optimal. With the invention of multi-cylinder engine monitors, many pilots started watching an unsettling graphic display of just how far from “optimal” or “uniform” the cylinders were running in their engines.

During a normal lean cycle, such as most pilots routinely perform just after arriving at their cursing altitude, pilots with engine monitors have discovered that the EGT’s on the various cylinders will all reach peak at greatly different total engine fuel flows. At cruise power settings, GAMI engineers have seen some engines in which the first cylinder reached peak EGT at, for example, 15 GPH, and the last cylinder did not reach peak until the engine had been leaned to a fuel flow of 13 GPH or less. This “spread” in fuel flows, from the first cylinder to reach peak EGT until the last cylinder to reach peak EGT, is a sure indication of just how unbalanced the fuel/air ratios are between the various cylinders.

Notice in the discussion above, that the important issue is when in the complete lean cycle each cylinder reaches peak EGT, not the absolute value of any particular EGT. Many pilots make the mistake of focusing on the absolute temperature of the individual cylinder’s EGT, rather than focusing on the sequential timing when the different cylinders reach their maximum exhaust gas temperature.

Musical Injectors

Over the years, a number of pilots and mechanics have attempted, in a rather hit or miss fashion, to play “musical injectors” with their fuel injection nozzles. This never solves the problem. Some have even tried to alter the fuel flow by drilling out their injectors, or making ill-informed substitutions of different part numbered injectors. GAMI investigated the legality of such efforts. The FAA advised GAMI that any alteration of the fuel injector specifications would not be legal unless it was done under an STC. Don’t jeopardize your license and your insurance by shade tree engine alterations.

STC’d, PMA’d and Fully Legal.

GAMI has developed and certified specifications for a set of precision fuel injectors for almost all engines in the current Continental and Lycoming fleet of fuel injected engines. We have STCs and PMAs on over 300 different engine models.

These specifications are optimized for each engine model, based on the extensive testing with GAMI’s state-of-the-art 96 channel data acquisition system. Data, not “hangar talk”!


GAMIjector being flow tested

A GAMIjector® fuel injector being flow-tested