Cumpita, este motor V6 2.8 es el que traina las Blazer antiguas (S-10) andes del 4.3. Tambine estaban en las camionetas S10 antiguas y en el Jeep Cherokee tambien.
Aca tienes algunas pomadas como sacarle potencia a este motor :
http://www.4x4wire.com/tech/60degreeV6/index.htm
V6 , 2.8 lt, 60° entre bancos
-Modelo Carburado (Carter electronico de 2 gargantas):
Potencia = 115 Hp
Torque = 145 lb pie
-Modelo con TBI :
Potencia = 125 Hp
Torque = 152 lb pie
Este motor se hizo hasta el año 1989.-
Mas datos :
2.8L V6
Bore x Stroke 3.5O3inX2.992in (89mmX76mm)
Firing Order 1-2-3-4-5-6
Bearing Clearances
Main 0.0015-0.0025jn (0.038-0.064mm)
Rod 0.0011 -0.0025in (0.028-0 064mm)
Connecting Rod Side Clearance 0.008-0.020in (0.20-0.51 mm)
Camshaft
Lift
Intake 0.231 in (5.86mm)
Exhaust 0.262in (6.65mm)
Note: Cam above used on early base 2.8L V6’s & some S1Os &
Camaros
Intake 0.262in (6.65mm)
Exhaust 0.273in (6.94mm)
Journal Clearance 0.001 -0.0025in (0.026-0.063mm)
Crankshaft Main Journals
Small journal
#1, #2 & #4 Journals 2.4937-2.4946in (63.340-63.364mm)
#3 Journal 2.4932-2.4941 in (63.327-63.351 mm)
Large Journal 2.647-2.648in (67.241-67.265mm)
Taper (maximum) 0.0002in (0.005mm)
Out-Of-Round (maximum) 0.0002in (0.005mm)
Crankshaft Rod Journals
Small Journal 1.998-1 .999in (50.758-50.784mm)
Large Journal 1.998-1 .999in (50.758-50.784mm)
Taper (maximum) 0.0002in (0.005mm)
Out-Of-Round (maximum) 0.0002in (0.005mm)
Crankshaft End Play 0.0024-0.0083in (0.06-0.21 mm)
Cylinder Bore
Diameter 3.503-3.SO6in (88.992-89.070mm)
Taper (maximum) 0.0008in (0.020mm)
Out-Of-Round (maximum) 0.0008in (0.020mm)
Piston-To-Bore Clearance 0.0007-0.001 7in (0.017-0.043mm)
Oil Pressure (Engine @ Normal Operating Temp)
30-S5psi @ 2000rpm (205-38OkPa @
2000rpm)
Piston Ring End Gap Clearance
Top Compression 0.010-0.020in (0.25-0.50mm)
Second Compression 0.010-0.020in (0.25-0.50mm)
Oil Rails 0.011-0.030in (0.25-0.50mm)
Piston Ring Side Clearance
Top Compression 0.012-0.027in (0.30-0.70mm)
Second Compression 0.016-0.037in (0.40-0.95mm)
Oil (maximum) 0.OO8in (0.200mm)
Rocker Arm Ratio 1.50:1
Valve Stem Clearance 0.001 -0.0027in (0.026-0.068mm)
Valve Spring Pressure
Cast Iron Heads
Valve Open 195lbs @ 1.1 8in (867Nm @ 30mm)
Valve Closed 88lbs @ 1 .575in (391 Nm @ 40mm)
Aluminum Heads
Valve Open 215lbs @ 1.291 (956Nm @33mm)
Valve Closed 9Olbs @ 1.701 (400Nm @ 43mm)
Valve Spring Installed Height 1.575in (40mm)
Cast Iron Heads 1.614in (41mm)
Aluminum Heads 1.575in (40mm)
Torque Specifications 2.8L
AIR Tubing Nuts 18-20lb-ft
Bellhousing-To-Engine Bolts 30-35lb-ft
Clutch Pressure Plate-To-Flywheel Bolts 18lb-ft+30deg
Camshaft Sprocket Bolts 16-20lb-ft
Camshaft Rear Cover Bolts 84-96lb-in
Connecting Rod Nuts 36-42lb-ft
Cylinder Head Bolts
Aluminum Heads 33lb-ft+90deg
Cast Iron Heads 40lb-ft+90deg
Distributor Hold Down Bolt 23-28lb-ft
EGR Valve Nuts 16-20lb-ft
Engine Mounting Nuts 28-32lb-ft
Exhaust Manifold Bolts
Aluminum Heads 16-20lb-ft
Cast Iron Heads 22-28lb-ft
Flywheel Bolts 50-55lb-ft
Flexplate Bolts 50-55lb-ft
Intake Manifold Bolts (Carburated) 15-18lb-ft
Intake Manifold Bolts (Throttle Body) 15-18lb-ft
Intake Manifold Bolts (MPFI)
Lower Plenum 16-18lb-ft
Manifold 13-25lb-ft
Main Bearing Cap Bolts 68-72lb-ft
Oil Pan Bolts
M8x1.25mm X 14mm 16-20lb-ft
M6x1.00mm X 16mm 84-96lb-in
Oil Filter Adapter Bolt 61-65lb-ft
Oil Pan Drain Plug 16-20lb-ft
Oil Pan Stud 72-84lb-in
Oil Pump Mounting Bolt 28-32lb-ft
Oil Pump Cover Screws 72-96lb-in
Rocker Arm Cover Bolts 72-96lb-ft
Rocker Arm Nut (Non-adjustable) 15-20lb-ft
Rocker Arm Studs 46-50lb-ft
Spark Plugs
Aluminum Heads (Apply Anti-seize to threads) 18-22lb-ft
Cast Iron Heads 22-25lb-ft
Thermostat Housing Bolts 16-18lb-ft
Timing Chain Case
10mm Bolts 34-40lb-ft
8mm Bolts 20-24lb-ft
Timing Chain Damper Bolts 13-17lb-ft
Torsional Damper Center Bolt 67-73lb-ft
Water Pump Bolts
M6 x 1.00mm X 25mm 72-96lb-in
M8 x 1.25mm X 70mm 16-20lb-ft
M10 x 1.50mm X 75mm 30-35lb-ft
Water Pump Nut 72-96lb-in