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  • 3900 Specs (LZ9)


    Engine Type
    60 degree V-6

    Displacement
    3.9L
    238 cu in

    RPO
    LZ9

    VIN
    1

    Bore
    99 mm
    3.90 in

    Stroke
    84 mm
    3.31 in

    Compression Ratio
    9.8:1

    Firing Order
    123456

    Spark Plug Gap
    1.00 mm
    0.040 in

    Block

    Camshaft Bearing Bore Diameter - Front and Rear
    55.26-55.31 mm
    2.175-2.177 in

    Camshaft Bearing Bore Diameter - Middle #2, #3
    54.75-54.80 mm
    2.155-2.157 in

    Crankshaft Main Bearing Bore Diameter
    72.1535-72.0695 mm
    2.840-2.841 in

    Crankshaft Main Bearing Bore Out-of-Round
    0.008 mm
    0.00031 in

    Cylinder Bore Diameter
    99.000-99.018 mm
    3.897-3.898 in

    Cylinder Bore Out-of-Round - Diameter - Production
    0.026 mm
    0.0010 in

    Cylinder Bore Out-of-Round - Diameter - Service
    0.030 mm
    0.0011 in

    Cylinder Bore Taper - Production
    0.026 mm
    0.0010 in

    Cylinder Bore Taper - Service
    0.030 mm
    0.0011 in

    Cylinder Head Deck Height
    224 mm
    8.818 in

    Cylinder Head Deck Surface Flatness
    0.05 mm per 150 mm
    0.0019 in per 5.905 in

    Valve Lifter Bore Diameter
    21.417-21.455 mm
    0.843-0.844 in

    Camshaft

    Camshaft Bearing Inside Diameter
    51.500-51.525 mm
    2.028-2.029 in

    Camshaft Journal Diameter
    51.415-51.440 mm
    2.024-2.025 in

    Camshaft Journal Out-of-Round
    0.025 mm
    0.001 in

    Camshaft Lobe Lift - Exhaust
    6.9263 mm
    0.2727 in

    Camshaft Lobe Lift - Intake
    6.9263 mm
    0.2727 in

    Cooling System

    Capacity
    12.4 liters
    13.1 quarts

    Thermostat Full Open Temperature
    195 degrees

    Connecting Rod

    Connecting Rod Bearing Clearance
    0.18-0.062 mm
    0.0007-0.017 in

    Connecting Rod Bore Diameter
    60.322-60.338 mm
    2.375-2.376 in

    Connecting Rod Bore Out-of-Round
    0.006 mm
    0.00023 in

    Connecting Rod Length - Center to Center
    150 mm
    5.9 in

    Connecting Rod Side Clearance
    0.200-0.241 mm
    0.008-0.009 in

    Crankshaft

    Connecting Rod Journal Diameter
    57.122-57.138 mm
    2.248-2.249 in

    Connecting Rod Journal Out-of-Round
    0.005 mm
    0.0002 in

    Connecting Rod Journal Taper
    0.005 mm
    0.0002 in

    Connecting Rod Journal Width
    21.92-22.08 mm
    0.863-0.869 in

    Crankshaft End Play
    0.060-0.210 mm
    0.0024-0.0083 in

    Crankshaft Main Bearing Clearance - Except #3
    0.019-0.064 mm
    0.0008-0.0025 in

    Crankshaft Main Bearing Clearance - #3 Thrust Bearing
    0.032-0.077 mm
    0.0012-0.0030 in

    Crankshaft Main Journal Out-of-Round
    0.005 mm
    0.0002 in

    Crankshaft Main Journal Taper
    0.005 mm
    0.0002 in

    Crankshaft Rear Flange Runout
    0.04 mm
    0.0016 in

    Cylinder Head

    Combustion Chamber Depth - at Measurement Point
    2.2 mm
    0.087 in

    Surface Finish - Maximum
    2.8 RA

    Surface Flatness - Block Deck
    0.08 mm per 152 mm
    0.003 in per 6 in

    Surface Flatness - Exhaust Manifold Deck
    0.1 mm
    0.004 in

    Surface Flatness - Intake Manifold Deck
    0.1 mm
    0.004 in

    Valve Guide Bore - Exhaust
    8.01 mm
    0.315 in

    Valve Guide Bore - Intake
    8.01 mm
    0.315 in

    Valve Guide Installed Height
    16.6 mm
    0.654 in

    Lubrication System

    Oil Capacity - with Filter
    3.8 liter
    4.0 quarts

    Oil Pressure - @ 1850 RPM
    207-310 kPa
    30-45 PSI

    Oil Pump

    Gear Diameter
    38.05-38.10 mm
    1.498-1.500 in

    Gear Pocket - Depth
    30.52-30.58 mm
    1.202-1.204 in

    Gear Pocket - Diameter
    38.176-38.226 mm
    1.503-1.505 in

    Gears Lash
    0.094-0.195 mm
    0.0037-0.0077 in

    Relief Valve-to-Bore Clearance
    0.038-0.089 mm
    0.0015-0.0035 in

    Pin

    Piston Pin Clearance to Connecting Rod Bore - Press Fit
    -0.004 to -0.021 mm
    -0.0001 to -0.0008 in

    Piston Pin Clearance to Piston Pin Bore
    0.002-0.010 mm
    0.00008-0.0004 in

    Piston Pin Diameter
    23.952-23.955 mm
    0.942-0.943 in

    Piston Pin Length
    64.21-64.44 mm
    2.57-2.53 in

    Piston

    Piston Diameter - Production
    98.970-99.008 mm
    3.896-3.897 in

    Piston Diameter - Service Limit
    98.950 mm
    3.895 in

    Piston Pin Bore Diameter
    23.957-23.962 mm
    0.943 in

    Piston Ring Groove Width
    1.22-1.24 mm
    0.048-0.049 in

    Piston to Bore Clearance - Production
    -0.008 to +0.048 mm
    -0.0003 to +0.0018 in

    Piston to Bore Clearance - Service Limit - Maximum
    0.080 mm
    0.003 in

    Piston Ring End Gap

    First Compression Ring
    0.15-0.30 mm
    0.006-0.011 in

    Second Compression Ring
    0.25-0.45 mm
    0.009-0.017 in

    Oil Control Ring
    0.15-0.65 mm
    0.06-0.025 in

    Piston Ring to Groove Clearance

    First Compression Ring
    0.03-0.065 mm
    0.001-0.002 in

    Second Compression Ring
    0.02-0.055 mm
    0.0007-0.002 in

    Oil Control Ring
    0.01 mm
    0.004 in

    Piston Ring Thickness

    First Compression Ring
    1.175-1.190 mm
    0.046-0.047 in

    Second Compression Ring
    1.475-1.490 mm
    0.058 in

    Oil Control Ring - Maximum
    2.50 mm
    0.098 in

    Valves

    Valve Face Angle
    45 degrees

    Valve Seat Angle
    46 degrees

    Valve Seat Depth - Exhaust - From Deck Face
    8.9-9.1 mm
    0.350-0.358 in

    Valve Seat Depth - Intake - From Deck Face
    7.9-8.1 mm
    0.311-0.318 in

    Valve Seat Width - Exhaust
    1.70-2.0 mm
    0.067-0.079 in

    Valve Seat Width - Intake
    1.55-1.80 mm
    0.061-0.071 in

    Valve Stem-to-Guide Clearance
    0.026-0.068 mm
    0.0010-0.0027 in

    Valve Lifters/Push Rods

    Push Rod Length - Intake
    146.0 mm
    5.75 in

    Push Rod Length - Exhaust
    152.5 mm
    6.0 in

    Valve Springs

    Valve Spring Free Length
    48.5 mm
    1.89 in

    Valve Spring Installed Height
    43.2 mm
    1.701 in

    Valve Spring Load - Closed
    320 N 43.2 mm
    75 lb 1.701 in

    Valve Spring Load - Open
    1036 N 32 mm
    230 lb 1.260 in

    Valve Spring Total Number of Coils
    6.55
    2009 Panther Black G8 GT
    334 WHP 347 WTQ

  • #2
    How about a comparison table between the 3.5 and the 3.9? It think that would be kinda cool just so everyone knows what the exact differences are between the two engines. I would say throw in the GXP also but I don't think the actual specs are out-just the horsepower. Good job though.
    TRADED IN BUT NEVER FORGOTTEN: 2006 GT Coupe in granite metallic, 15/5% tint, vinyl side marker deletes, Doctor Speed Stage 3 CAI, RED calipers by DupliColor, RED LED interior lights, 45 LED tail lights, WideView 8000K HID coversion kit, Nokya Artic White fogs installed, running MoBil 1, FIRST ever granite metallic color matched headlights!! Color matched eyelids just finished! GT-R Exhaust installed. R1 Concepts drilled and slotted zinc plated front rotors.

    Comment


    • #3
      Originally posted by LoJac963
      How about a comparison table between the 3.5 and the 3.9? It think that would be kinda cool just so everyone knows what the exact differences are between the two engines. I would say throw in the GXP also but I don't think the actual specs are out-just the horsepower. Good job though.
      Good idea, dont have time right now, but anyone can do it!
      2009 Panther Black G8 GT
      334 WHP 347 WTQ

      Comment


      • #4
        yeah true, lol-didn't mean to come across as pushy or anything
        TRADED IN BUT NEVER FORGOTTEN: 2006 GT Coupe in granite metallic, 15/5% tint, vinyl side marker deletes, Doctor Speed Stage 3 CAI, RED calipers by DupliColor, RED LED interior lights, 45 LED tail lights, WideView 8000K HID coversion kit, Nokya Artic White fogs installed, running MoBil 1, FIRST ever granite metallic color matched headlights!! Color matched eyelids just finished! GT-R Exhaust installed. R1 Concepts drilled and slotted zinc plated front rotors.

        Comment


        • #5
          Originally posted by LoJac963
          yeah true, lol-didn't mean to come across as pushy or anything
          lol dont worry about it man, I was just leaving for a 7 hour drive when i posted last.
          2009 Panther Black G8 GT
          334 WHP 347 WTQ

          Comment


          • #6
            3900:
            Engine Type: 60 degree V-6
            Displacement:
            3.9L, 238 cu in
            RPO: LZ9
            VIN: 1
            Bore:
            99 mm, 3.90 in
            Stroke:
            84 mm, 3.31 in
            Compression Ratio:
            9.8:1
            Firing Order:
            123456
            Spark Plug Gap:
            1.00 mm, 0.040 in

            The 3900 "LZ9", and the new 3500 "LZ4/LZE" engines (not to be confused with the regular variant 3500 "LX9" engine which is just a larger bore 3400) are what GM is calling the "High Value" engines. These two engines share 80% of the components between each other.
            The 3500 shares the same bore as the 3900, But has a much smaller stroke at: 2.99 inch, 76mm (same stroke the original 60v6 the 2.8L had back in the day)

            I know most of this is what Jordie already posted from myself on 60v6.

            This is info I posted a while back on 60degreev6.com about the Changes GM has made compared to the older 3100/3400/3500 gen3 660's.

            Block centerline is changed by 3mm.

            Camshaft bearings are larger journal diameter (55mm now up from 51mm we are used to) to accomodate larger camshaft profiles.

            9.8:1 compression ratio (at least for the 3900, havn't checked the 3500 yet)

            Camshaft phasing, which can advance and retard the camshaft 25 degree's throughout the powerband to create a broad flat torque/powerband.

            Tuned Plenum with Intake Manifold Tuning Valve, -opens and closes dual ports in the plenum to create a low and high rpm runners/plenum.
            The 3900 uses a larger ported lower Intake manifold,

            There is a larger 72mm throttle body on the Plenum,

            Heads are different, and do not share any related component with previous 60v6 heads. 47.5mm (1.87inch) Intake valves and 38.7mm (1.52inch) exhaust valves are in the heads which feature revised port shapes and different combustion chamber shapes. as far as the rockers all I know is that "Features rocker arms similar to those found on LS1 V8's" What the actual ratio is not sure if its still 1.6:1 or now 1.7:1 like the LS engines.


            Exhaust manifolds are new redesigned and tuned for maximum performance (as per what GM claims anyways)

            Each cylinder bores have piston oil squirters to keep pistons cool.
            Features a High volume oil pump to accomodate the larger oil system requirements from the squirters and as well as the cam phaser actuator setup. The Oil pump drive gear is different and cannot be interchanged withe the previous engines drive gear.

            New style Delphi Multec 3.5 injectors featuring new design features.

            New redesigned Cooling system which flows the coolant through and around the block in a different more uniform path through the engine.


            There are other small changes and whatnot that I know I'm missing.
            Colin.
            06 G6 GTP. 6spd.
            92 Sunbird GT, 3200 Hybrid N/A 13.99 @ 95.22mph
            90 Talon TSi -13.76 @ 99.41

            Comment


            • #7
              good info, interesting stuff, thanks for the post!!
              TRADED IN BUT NEVER FORGOTTEN: 2006 GT Coupe in granite metallic, 15/5% tint, vinyl side marker deletes, Doctor Speed Stage 3 CAI, RED calipers by DupliColor, RED LED interior lights, 45 LED tail lights, WideView 8000K HID coversion kit, Nokya Artic White fogs installed, running MoBil 1, FIRST ever granite metallic color matched headlights!! Color matched eyelids just finished! GT-R Exhaust installed. R1 Concepts drilled and slotted zinc plated front rotors.

              Comment


              • #8
                Re: 3900 Specs.

                Originally posted by Blackrider

                Firing Order: 1-2-3-4-5-6
                WOW!! I don't think I've heard of any other V6 with this kind of firing order! : (Correct me if I am wrong ofcoarse)

                I liek the idea of a "Comparison Chart" idea. Hell, if anyone wants to give me all the data they want, I can make up a pretty snazzy chart like in Motor Week or what ever and post it in here to be stickied. All I know abotu the two is 3.9 has 40 extra horsies.
                Straight up Pimp Trollin'
                2006 Silver MazdaSpeed 6 Grand Touring Sedan
                w/ Real Working BOV Action!!!11!

                "Zoom Zoom + 6psi Bitches!"

                Comment


                • #9
                  Re: 3900 Specs.

                  Originally posted by CoupeOfG6
                  Originally posted by Blackrider

                  Firing Order: 1-2-3-4-5-6
                  WOW!! I don't think I've heard of any other V6 with this kind of firing order! : (Correct me if I am wrong ofcoarse)

                  I liek the idea of a "Comparison Chart" idea. Hell, if anyone wants to give me all the data they want, I can make up a pretty snazzy chart like in Motor Week or what ever and post it in here to be stickied. All I know abotu the two is 3.9 has 40 extra horsies.
                  3100 3400 3500's all have 1-2-3-4-5-6 fireing order
                  2009 Panther Black G8 GT
                  334 WHP 347 WTQ

                  Comment


                  • #10
                    Learn a little more everyday!
                    Straight up Pimp Trollin'
                    2006 Silver MazdaSpeed 6 Grand Touring Sedan
                    w/ Real Working BOV Action!!!11!

                    "Zoom Zoom + 6psi Bitches!"

                    Comment


                    • #11
                      that is an amazingly odd firing order I have to say
                      TRADED IN BUT NEVER FORGOTTEN: 2006 GT Coupe in granite metallic, 15/5% tint, vinyl side marker deletes, Doctor Speed Stage 3 CAI, RED calipers by DupliColor, RED LED interior lights, 45 LED tail lights, WideView 8000K HID coversion kit, Nokya Artic White fogs installed, running MoBil 1, FIRST ever granite metallic color matched headlights!! Color matched eyelids just finished! GT-R Exhaust installed. R1 Concepts drilled and slotted zinc plated front rotors.

                      Comment


                      • #12
                        Re: 3900 Specs.

                        Originally posted by CoupeOfG6
                        Originally posted by Blackrider

                        Firing Order: 1-2-3-4-5-6
                        WOW!! I don't think I've heard of any other V6 with this kind of firing order! : (Correct me if I am wrong ofcoarse)
                        The 60degreev6 has used this firing order since its birth back in the 80's with the 2.8L. Its really nice actually. Simple to remember LOL.
                        Colin.
                        06 G6 GTP. 6spd.
                        92 Sunbird GT, 3200 Hybrid N/A 13.99 @ 95.22mph
                        90 Talon TSi -13.76 @ 99.41

                        Comment


                        • #13
                          yeah it is easy, better than SB chevy's. This is my first V6 other than all the SB350's I've owned and I have to say I love it. I went from small blocks to a 2.2 ecotec and it killed me. That little engine did get up and go though, it will always have a place in my heart as my first car. I can't get over the fact that my G6 doesn't feel like it wants to die when I turn the AC on like the ecotec did
                          TRADED IN BUT NEVER FORGOTTEN: 2006 GT Coupe in granite metallic, 15/5% tint, vinyl side marker deletes, Doctor Speed Stage 3 CAI, RED calipers by DupliColor, RED LED interior lights, 45 LED tail lights, WideView 8000K HID coversion kit, Nokya Artic White fogs installed, running MoBil 1, FIRST ever granite metallic color matched headlights!! Color matched eyelids just finished! GT-R Exhaust installed. R1 Concepts drilled and slotted zinc plated front rotors.

                          Comment


                          • #14
                            ya ive seen it a number of times, still odd if you ask me
                            jeff
                            05 G6 GT:front air splitter, "speed limiter" removed. Red halo fog lights. fab'd short ram intake(the 1st). first ever side exhaust G6 =) de-badged, removed and filled f.bumper pontiac symbol (another 1st)
                            90 bmw 535i :turbo, exhaust, intake, a lot...
                            1988 mitsubishi starion esi-r (just bought)
                            F/A-22 raptor crewchief USAF

                            Comment


                            • #15
                              I agree that it's odd. I would like to know how the engine stays balanced. Would be some interesting information.
                              Redline Elite Quicklift Kit
                              GT-R Exhaust System
                              K&N Typhoon CAB
                              EBC Slotted/Cross Dimpled Front/Rear Rotors
                              EBC RedStuff Front/Rear Pads

                              Comment

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