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  • L83 related component images

    I will use this thread to post pictures of the L83 engine and engine related components so people can see what has changed and what has stayed the same for 2014 and the Gen V engine.

  • #2
    Crankshaft related images

    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.

    Click image for larger version

Name:	L83 crank_640x480.jpg
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    And here is the same crankshaft next to a Gen IV V8 crankshaft:

    Click image for larger version

Name:	Gen V vs IV crankshaft.jpg
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    • #3
      L83 camshaft

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

      Click image for larger version

Name:	Gen V vs IV camshaft.jpg
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      Extra lobe that is wider than the others is at the back of the engine and drives the high pressure fuel pump.

      Comment


      • #4
        Silverado engine compartment

        Engine compartment with L83 engine:

        Click image for larger version

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

        Click image for larger version

Name:	L83 with intake removed.jpg
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        with sound deadening pad removed, showing injectors and rails and valley tray:

        Click image for larger version

Name:	valley showing fuel rails.jpg
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        thermostat housing and engine coolant temperature (ECT) sensor now mounted in water pump assembly (no longer in cylinder head):

        Click image for larger version

Name:	thermostat and ECT sensor.jpg
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ID:	3870

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        • #5
          Vacuum pump

          The L83 truck engine runs a belt driven mechanical vacuum pump in order to generate vacuum for the brake booster.

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

          Click image for larger version

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

          Click image for larger version

Name:	vacuum line.jpg
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ID:	3872

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          • #6
            MAF sensor

            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 3 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):

            Click image for larger version

Name:	MAF sensor.jpg
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ID:	3873

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            • #7
              DI fuel pump

              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:

              Click image for larger version

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              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.
              Last edited by Jason@Lingenfelter; 06-18-2013, 05:40 PM.

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              • #8
                E92 ecm

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

                Click image for larger version

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                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:

                Click image for larger version

Name:	E92_ECM_sm.jpg
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                More inputs and outputs (I/O) and the E92 has the built in high voltage drivers for the direct injection injectors.

                Comment


                • #9
                  Crank nose with keyway

                  Close up of the front of the crank showing the keyway:

                  Click image for larger version

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                  another view:

                  Click image for larger version

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                  • #10
                    L83 intake manifold

                    Here is an image of the L83 intake manifold:

                    Click image for larger version

Name:	L83 intake1_sm.jpg
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                    and another:

                    Click image for larger version

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                    and another:

                    Click image for larger version

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                    and here is a comparison to the L96/L93/LY6 intake (6.0/6.2L 2007-2013 trucks):

                    Click image for larger version

Name:	L83 vs L92 intake3_sm.jpg
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ID:	3883Click image for larger version

Name:	L83 vs L92 intake1_sm.jpg
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ID:	3882Click image for larger version

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ID:	3884

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                    • #11
                      L83 combustion chamber w valves

                      The stock L83 intake valve size is 1.928" and weighs 99.5 grams. Here is an image of the valve:

                      Click image for larger version

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                      The stock exhaust valve measures 1.556" and weighs 90.3 grams. Here is an image of the valve:

                      Click image for larger version

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                      Here is an image of the combustion chamber with stock valves:

                      Click image for larger version

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                      • #12
                        Stock L83 cylinder head flow data

                        Here is a graph and table showing the stock L83 cylinder head flow data:

                        Click image for larger version

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                        L83 chamber volume: 57.6 cc
                        Intake runner volume: 248 cc
                        Exhaust runner volume: 102 cc

                        We flow tested on a 3.900" bore instead of the stock 3.780" bore size because we don't currently have a 3.780" size bore sleeve for our flow bench fixture (soon to be corrected).
                        Last edited by Jason@Lingenfelter; 07-02-2013, 04:04 PM.

                        Comment


                        • #13
                          Gen III 5.3L vs Gen V 5.3L flow data

                          Here is a graph comparing the Gen III LM4 5.3L cylinder head intake flow data to the L83 intake flow data:
                          Click image for larger version

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                          Here is a graph comparing the Gen III LM4 5.3L cylinder head exhaust flow data to the L83 exhaust flow data:
                          Click image for larger version

Name:	5.3L vs 5.3L exh compare_640x480.jpg
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                          Some of the other comparison data for the LM4 heads:
                          The chamber volume was 62.6 cc.
                          The intake runner volume was 204 cc.
                          The exhaust runner volume was 76 cc.
                          Intake valve size was 1.890".
                          Exhaust valve size was 1.550".

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                          • #14
                            L83 Gen V V8 vs LS Gen III/IV V8 exhaust ports

                            Here is an image of the L83 Gen V exhaust flange/exhaust ports on the cylinder heads:
                            Click image for larger version

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                            Here is an image of the L83 cylinder head with a Gen III/IV exhaust gasket for comparison. With the evenly spaced exhaust ports and the same bore centers it makes sense that the exhaust ports line up but note that none of the bolt holes do:
                            Click image for larger version

Name:	L83 w LS exh gasket_640x480.jpg
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ID:	3892

                            Comment


                            • #15
                              I forgot to mention that the L83 crankshaft is an eight (8) bolt crankshaft.

                              Originally posted by Jason@Lingenfelter View Post
                              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.

                              [ATTACH=CONFIG]3962[/ATTACH]

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

                              [ATTACH=CONFIG]3963[/ATTACH]

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