Posted June 8, 201213 yr I own a 6.7 so they have a solenoid on it. Anyways I was wondering how a 3rd gen knows when to fire the injectors. Also what year was common rail introduced for cummins engine?
June 8, 201213 yr Owner Prefect video of it... http://www.youtube.com/watch?v=aGwV9ueHcz41989-1993 1st Gen (VE Rotary injection pump)1994-1998 2nd Gen (P7100 Inline injection pump)1998.5-2002 2nd Gen (VP44 Rotary electronic injection pump)2003-Current 3rd and 4th Gen (Common rail injection)
June 8, 201213 yr Pre-CR the injectors were fired by fuel pressure. The pump would pressurize the fuel in firing order (why pre-CR pumps are timed, and a CR isn't). The fuel would reach "x" pressure (300 bar comes to mind, or ~4500 psi) the fuel pressure would overcome the spring pressure and the injector would open. The fuel pump would send a specific amount of fuel to each injector and as soon as the pressure dropped below "x" the injector would close. This is also why the injector lines on pre-CR trucks are equal length, and why they are different on a CR.
June 8, 201213 yr Owner Dang... I should of posted this... As for the fuel pressure is sent down to the nozzle lift the pintle against the spring once the VP44 moves on to the next the pressure fades and closed against the spring. This all happens very rapidly.
June 19, 201213 yr 12-valve injector (2nd Gen P-7100 pumped) 24-valve injector (2nd Gen VP44 pumped) 24-valve Common Rail injector (3rd Gen CP3 pumped) - - - Updated - - -
June 20, 201213 yr Do the fuel lines connect directly to the p7100 injectors without cross over tubes?
June 20, 201213 yr Owner Do the fuel lines connect directly to the p7100 injectors without cross over tubes? All 12V engine have the injection lines directly to the injector. The return rail is also external of the engine too.
I own a 6.7 so they have a solenoid on it. Anyways I was wondering how a 3rd gen knows when to fire the injectors. Also what year was common rail introduced for cummins engine?