Announcement

Collapse
No announcement yet.

2.8L (Gen 2) Specifications

Collapse
X
Collapse
  •  

  • 2.8L (Gen 2) Specifications

    General Data: All dimensions are in millimeters

    Type

    60 degree V6

    Displacement

    2.8L

    RPO

    LB6

    Bore

    89.0

    Stroke

    76.0

    Deck Height

    224

    Compression Ratio

    8.9:1

    Firing Order

    1-2-3-4-5-6

    Oil Pressure

    69 kPa @500 RPM; 205-380 kPa @ 2000 RPM

    (10 psi @ 500 RPM; 30-55 psi @ 2000R RPM)

    Cylinder Bore:

    Diameter

    88.983-89.017

    Out of Round

    0.013 (Maximum)

    Taper - Thrust Side

    0.013 (Maximum)

    Piston:

    Clearance

    0.023-0.056

    Piston Ring:

    COMPRESSION

    Groove Clearance

    Top

    0.051.089

    Second

    0.051.089

    Gap

    Top

    0.25-0.50

    Second

    0.25-0.50

    OIL

    Groove Clearance

    0.199 (Maximum)

    Gap

    0.25-076

    Piston Pin:

    Diameter

    22.992-22.997

    Clearance

    0.0064-0.0091

    Fit in Rod

    Press

    Crankshaft:

    Main

    Journal

    		 Diameter

    67.241-67.267

    Taper

    0.005 (Maximum)

    Out Of Round

    0.005 (Maximum)

    Main Bearing Clearance

    0.030-0.069

    Crankshaft End Play

    0.05-0.20

    Crankpin

    Diameter

    50.757-50.785

    Taper

    0.005 (Maximum)

    Out of Round

    0.005 (Maximum)

    Rod Bearing Clearance

    0.036-0.091

    Rod Side Clearance

    0.36-0.68

    Camshaft:

    Lift

    Intake

    6.67

    Exhaust

    6.93

    Journal Diameter

    47.442-47.790

    Journal Clearance

    0.02-0.10

    Valve System:

    Lifter

    Hydraulic

    Rocker Arm Ratio

    1.50:1

    Valve Lash

    Intake

    1-1/2 Turns Down from Zero Lash

    Exhaust

    Face Angle (Intake & Exhaust)

    45 degrease

    Seat Angle (Intake & Exhaust)

    46 degrease

    Seat Runout (Intake & Exhaust)

    0.02

    Seat Width

    Intake

    1.55-1.85

    Exhaust

    1.70-2.01

    Stem Clearance

    0.025-0.069

    Valve Spring

    Free Length

    48.51

    Pressure

    Kg @ mm

    Closed

    40.8 @ 43.2

    Open

    97 @ 32.79

    Installed Height

    40.01

    Valve Spring

    Damper

    Free Length

    48.51

    Approx # of Coils

    4

    Fastener Tightening Specifications

    Item

    Nm

    Ft Lbs

    Camshaft Sprocket Bolts

    24

    18

    Connecting Rod Bolt Nuts

    51

    37

    Crankshaft Damper Bolt

    77

    104

    Cylinder Head Bolt (apply thread sealant to bolts)

    		 * *
    First Pass

    45

    33
    Final Pass Add 90 Degrees

    *Manifold Side*

    6 2 3 7

    5 1 4 8

    * Outer Side *

    * *

    Exhaust Manifold Bolt

    24

    18

    Flywheel Bolt

    71

    52

    Front Timing Cover Case Bolt

    		 * *
    8mm 18-35 13-25
    10mm 27-47 20-35

    Lower Intake Manifold Bolt

    		* *
    First Pass 22 16
    Final Pass 31 23

    Upper Intake Manifold Bolt

    22

    16
    Main Bearing Cap 99 73

    Oil Pan Bolt

    		 * *

    6mm

    8-12

    6-9
    8mm 19-30 14-22

    Oil Pump Bolt

    41

    30

    Rocker Arm Nut

    24

    18

    Timing Chain Damper Bolt

    20

    15
    Tags: None
      Posting comments is disabled.

    Article Tags

    Collapse

    There are no tags yet.

    Latest Articles

    Collapse
    • Gen 2 Flowsheets
      by SappySE107
      Might be a work in progress? Lets just get started and see where it goes. 28", 3.700" bore. PAP % 100cfm +5% 200cfm +1% 300cfm +1%

      Starting off with the bare head, using clay to bellmouth the port inlet.


      Next we will put the intake manifolds on, with the throttle body and all vac ported blocked and untested ports taped off. This shows flow distribution between all runners.



      This is the comparison sheet for the middle port using...
      08-18-2024, 12:04 PM
    • Using an adjustable pushrod for lifter preload
      by SappySE107
      Our engines use non adjustable rocker arms, so pushrod length is import to lifter preload, which is important for performance. Incorrect preload does change power on the dyno, or in extreme cases, the ability to run well or at all.

      There are 2 options for the adjustable pushrods, a shorter option custom made for wot-tech for use on 3100/3400/3500 LX9 engines. These measure below 5.700", which is very short for an automotive engine. The other option is a Comp pushrod that measures...
      07-18-2024, 12:29 AM
    • Gen 2 to Gen 3 Top-End Swap
      by bszopi
      The 3100 and 3400 engines are called Gen 3, because they are the third generation pushrod 60V6 engines. The reason for the swap is simple. Flow and design, both of which the Gen 3 triumphs all previous generations. The iron heads don't have splayed valves, D shaped exhaust ports, or in some cases even the larger valves (1.42/1.72). The Gen 2 Aluminum head engines are the most popular to do this swap, but no matter what you start with, the same steps apply. The Gen 3 parts have D shaped exhaust po...
      11-16-2010, 11:53 PM
    • 3.1L (Gen 2) Specifications
      by bszopi
      ...
      06-15-2010, 05:25 PM
    • 2.8L (Gen 2) Specifications
      by bszopi
      ...
      04-21-2010, 08:18 PM
    View All
    Working...
    X