AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual
Page 314
308
© 2014 AEM Performance Electronics
Infinity User Manual
An example of this equation is:
6 CYL. engine rated at 500 hp on gasoline using moderate boost with a 15% safety margin on
the injector
500 x .625 = 313 lbs/6 = 52 lbs/hr/ injector. 52 x 1.15 = 60lbs/hr/ injector
If we take the flow of the injector (60 lbs/hr) and multiply it by the number of cylinders (6), we arrive
at a total of 360 lbs/hr of flow. As you can see, the fuel pump described in the fuel pump sizing
section referenced above has enough capacity to feed the engine with a little room to spare.
It is a good idea to know the maximum operating pressure of the fuel injectors. In some cases
the fuel injector will not open if the fuel pressure exceeds the design limit of the injector. Also, at
the higher pressures the injector fuel flow may become non-linear and cause inconsistent fuel
delivery, usually creating a lean condition. Most injectors can withstand up to 70 psi. Many of the
pintle style injectors can withstand higher pressure.
In the fuel injector sizing, always use a safety margin between 15–20%.
For more information, go to
89