Pontiac Gasoline Straight-4 Iron Duke Tech IV (Van) 1987-1990
Pontiac Gasoline Straight-4 Iron Duke Tech IV (Van) 1987-1990 is an 151 in³ (2.47 L) internal combustion reciprocating Inline 4 engine. It has bore/stroke ratio of 4 in × 3 in (10.16 cm × 7.62 cm), and uses 9:1 compression. This engine was rated 96 hp (71.59 kW) at 4400 rpm and 135 lbf⋅ft (183.04 N⋅m) of torque at 3200 rpm. It was used in Chevrolet, GMC, and Pontiac cars.
Parameter | Output |
---|---|
Power Rating | 96 hp (71.59 kW) at 4400 RPM |
Torque Rating | 135 lbf⋅ft at 3200 RPM |
Parameter | Value |
---|---|
Type | Internal Combustion Reciprocating |
Fuel Type | Gasoline |
Cylinder Configuration | Inline 4 |
Engine Displacement | 151 in³ |
Bore | 4 in |
Stroke | 3 in |
Compression Ratio | 9:1 |
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Parameter | Value |
---|---|
Block Material | Cast iron |
Parameter | Value |
---|---|
Compression (standart) | 140 Psi |
Parameter | Value |
---|---|
Spark Plug Gap | 0.06 in |
Parameter | Value |
---|---|
Head Material | Cast iron |
Valvetrain Type | OHV |
Valves per Cylinder | 2 |
Parameter | Value |
---|---|
Air Intake Method | Naturally Aspirated |
Parameter | Value |
---|---|
Injection Type | Single Point |
Injection Info | TBI, via a single injector in the throttle body |
Parameter | Value |
---|---|
Ignition Timing | 8° B.T.C. |
Parameter | Value |
---|---|
Oil Pump Pressure | 41 Psi at 2000 RPM |
Condition | Value |
---|
expand_moreGeneral specifications
expand_moreCylinder block
Bore out-of-round | 0.0014 in |
Maximum | |
Bore taper | 0.0005 in |
Maximum |
expand_morePiston
Top clearance in bore | 0.0025–0.0033 in |
Bottom clearance in bore | 0.0017–0..0041 in |
Piston diameter | 3.9971–3.9974 in |
expand_morePiston rings
Compression ring side clearance (top) | 0.0015–0.003 in |
Compression ring side clearance (bottom) | 0.0015–0.003 in |
Compression ring-width (top) | 0.062–0.062 in |
Compression ring-width (bottom) | 0.0775–0.078 in |
Upper compression ring gap | 0.01–0.022 in |
Lower compression ring gap | 0.01–0.027 in |
Oil ring width | 0.189 in |
Oil ring gap | 0.015–0.055 in |
expand_morePiston pin
Diameter | 0.938–0.942 in |
Length | 3 in |
Pin to piston clearance | 0.0003–0.0005 in |
Loose | |
Fit in rod | Press |
expand_moreCrankshaft and connecting rod
expand_moreMain bearing journal
Diameter | 2.3 in |
Out-of-round | 0.0005 in |
Maximum | |
Taper | 0.0005 in |
Maximum | |
Clearance limit new | 0.0005–0.0022 in |
Crankshaft end play (when new) | 0.0035–0.0085 in |
expand_moreRod bearing journal
Diameter | 2 in |
Out-of-round | 0.0005 in |
Maximum | |
Taper | 0.0005 in |
Maximum | |
Clearance limit new | 0.0005–0.0026 in |
Rod side clearance | 0.006–0.022 in |
expand_moreCamshaft
Intake | 0.398 in |
Exhaust | 0.398 in |
Journal diameter | 1.869 in |
Journal clearance | 0.0007–0.0027 in |
End play clearance | 0.0015–0.005 in |
expand_moreValve train
expand_moreLash intake and exhaust
Rocker arm ratio | 1.75:1 |
Push rod length | 9.754 in |
expand_moreValve lifter
Leak down rate | 12 to 90 seconds with 50 lb. load |
Lifter body diameter | 0.842–0.843 in |
Plunger Travel | 0.125 in |
Clearance in boss | 0.0025 in |
Lifter bore diameter | 0.8435–0.8445 in |
expand_moreValves
expand_moreIntake
Face Angle | 45° |
Seat angle | 46° |
Head Diameter | 1.72 in |
Stem diameter | 0.3425–0.3418 in |
Overhall Length | 4.924 in |
Stem to guide clearance | 0.001–0.0027 in |
Valve seat width | 0.0353–0.0747 in |
Valve installed height | 1.69 in |
expand_moreExhaust
Face Angle | 45° |
Seat angle | 45° |
Head Diameter | 1.5 in |
Stem diameter | 0.3418–0.3425 in |
Overhall Length | 4.92 in |
Stem to guide clearance top | 0.001–0.0027 in |
Stem to guide clearance bottom | 0.002–0.0037 in |
Valve seat width | 0.058–0.097 in |
Valve installed height | 1.69 in |
expand_moreValve spring pressure and length-valve
Closed | 78-86 lb. at 1.66 inches |
Open | 122-180 lb. @ 1.254 inches |
Condition | Value |
---|
Main bearing to the engine block screws | 70.07 lbf⋅ft |
Nut connecting rod | 32.45 lbf⋅ft |
Front oil pan lateral and rear side screws | 4.43 lbf⋅ft |
Plug Oil Pan Drain | 25.08 lbf⋅ft |
Nut oil screen support | 36.88 lbf⋅ft |
Oil pump to the engine block screws | 22.13 lbf⋅ft |
Oil pump cover screws | 10.33 lbf⋅ft |
Push rod cover to the engine block screws | 7.38 lbf⋅ft |
Bolt crankshaft hub | 162.26 lbf⋅ft |
Flywheel to crankshaft screws | 44.25 lbf⋅ft |
Nut EFI assembly to the manifold | 14.75 lbf⋅ft |
EFI assembly to the manifold screws | 14.75 lbf⋅ft |
Intake manifold to the cylinder head screws | 29.5 lbf⋅ft |
Exhaust manifold to the cylinder head screws | 44.25 lbf⋅ft |
Fuel pump to the engine block screws | 18.44 lbf⋅ft |
Distributor retaining clamp screws | 22.13 lbf⋅ft |
EGR valve to manifold screws | 10.33 lbf⋅ft |
Water outlet housing screws | 19.91 lbf⋅ft |
Thermostat housing screws | 19.91 lbf⋅ft |
Water pump to the engine block screws | 25.08 lbf⋅ft |
Timing cover to the engine block screws | 7.38 lbf⋅ft |
Timing cover to oil pan screws | 7.38 lbf⋅ft |
Fan and pulley to the water pump screws | 17.7 lbf⋅ft |
Radiator hoses clamps | 1.48 lbf⋅ft |
Rocker arm screws | 19.91 lbf⋅ft |
Cylinder head to the engine block screws | 92.2 lbf⋅ft |
Rocker arm cover screws | 5.9 lbf⋅ft |
Camshaft thrust plate to the engine block screws | 7.38 lbf⋅ft |