Jason Haines @ LPE

I thought people might be interested in seeing some of the Gen V L83 5.3L direction injection V8 engine components so I will post some pictures of the components.

Jason Haines @ LPE

Here is an image of the L83 Gen V V8 engine cast iron crankshaft. 92mm (3.622") stroke, just like the previous engines. Weighs 53.8 lbs.



And here is the same crankshaft next to a Gen IV V8 crankshaft:

Jason Haines @ LPE

Here is an image of the Gen V V8 L83 camshaft next to a Gen IV camshaft:



Extra lobe that is wider than the others is at the back of the engine and drives the high pressure fuel pump.

Jason Haines @ LPE

Engine compartment with L83 engine:



with intake removed but sound deadening material still over injectors and rail:



with sound deadening pad removed, showing injectors and rails and valley tray:



thermostat housing and engine coolant temperature (ECT) sensor now mounted in water pump assembly (no longer in cylinder head):

Jason Haines @ LPE

Here is an image of the pump (attached to the block on the driver side low in the accessory drive):



Image of vacuum line that goes from the pump to the brake booster:

Jason Haines @ LPE

The L83 engine runs an eight wire mass airflow (MAF) sensor. Gen IV engines had a five wire sensor with two wires are for the intake air temperature and three wires are for the mass airflow. The added three wires are for a humidity sensor.

Here is an image of that sensor in the Silverado duct work (passenger side):

Jason Haines @ LPE

The L83 runs a mechanical fuel pump off of an extra lobe on the camshaft. The pump is mounted at the back of the engine in the valley. The pump is fed low pressure fuel by a PWM controlled electric fuel pump mounted in the fuel tank.

Here is an image of the mechanical DI pump as it sits in the valley of the engine:



During testing of the vehicle, we recorded fuel pressure levels in the high pressure side of the system of 426 psi to 2200 psi.

Fuel pressure in the low pressure (lift pump) side of the system ranged from around 40 to 90 psi averaging between 46 to 55 psi depending on the test.

Jason Haines @ LPE

Here is an image of the E92 ECM mounted in the vehicle.



Note the added security measures installed on the ECM (aka plastic ZIP tie). Ours no longer has a ZIP tie.

Here is an image of the new E92 ECM next to an E38 ECM (the ECM used in the 2007-2013 CK trucks) for comparison:



More inputs and outputs (I/O) and the E92 has the built in high voltage drivers for the direct injection injectors.

thunder550

iTrader: (70)

Cool, thanks for sharing

smokeshow

iTrader: (16)

That ECM is a beast. Looking forward to more of this stuff.