Cylinder Compression

Notes gleaned from several sources on OldIHC.org

Cylinder Compression
The following table shows the theoretical compression pressures for the various compression ratios. The pressure is given in pounds per square inch at cranking speed, which is approximately 125 to 150 revolutions of the engine. It’s a lot easier to turn the engine over and get good readings if all of the spark plus are removed during the test.
Compression Ratio
Compression Pressure
4.6–
–69
4.8–
–73
5.0–
–77
5.2–
–81
5.4–
–85
5.6–
–90
5.8–
–95
6.0–
–100
6.2–
–105
6.4–
–108
6.6–
–113
6.8–
–117
7.0–
–121
7.2–
–126
7.4–
–130
7.6–
–135
7.8–
–140
8.0–
–144
8.2–
–148
A compression test on each cylinder will substantiate the necessity for valve reconditioning. A variation in compression between cylinders of 10 or more pounds is cause for alarm.
Compression Ratios
GRD-214–
–6.3
GRD-233–
–6.3

Part numbers and cross references for IH fuel pumps

M6959

IH FUEL PUMPS
year engine model IH number AC Delco Carter-NAPA
  GRD 109692HA 9501 M836
50-66 SD,BD,BG 84838R94 4459 M835
  SV offset bowl   40375 M3405
  SV inline bowl   40334 M2774
  SV W/O filter 433114C92

41128

         
         

SV Engine Specifications Engine specifications for the IHC SV line of engines.

  • From Bill Thebert – BinderBulletin
  • Please note the different years in the headings by each engine model. Note that by 1979, for example, emissions equipment had reduced the HP output of the 4-196 to that of a 1974 vintage 4-152.

    Detailed Gasoline Engine Specifications (IH-made Engines)
    4-152
    (1974)
    4-196
    (1979)
    V-266 V-304A
    (1979)
    V-345A
    (1979)
    V-392
    (1974)
    Bore 3 7/8" 4.125" 3 5/8" 3 7/8" 3 7/8" 4 1/8"
    Stroke 3 7/32" 3.656" 3 7/32" 3 7/32" 3 21/32" 3 21/32
    Displacement 151.84 cu in 195.45 cu in 266 303.68 cu in 344.96 cu in 390.89 cu in
    Compression Ratio 8.19 to 1 8.02 to 1 8.4 to 1 8.19 to 1 8.28 to 1 8.02 to 1
    Dry Weight 542 lbs 545 lbs 619 lbs 700 lbs 725 lbs 765 lbs
    Net HP 80 @ 4400 76.5 bhp @ 3600 155 @ 4400 122 bhp @ 3400 150 bhp @ 3500 196 bhp @ 3600
    Net Torque 135 @ 2400 153 lb-ft @ 2000 227 lb-ft @ 2800 226 lb-ft @ 2000 263 lb-ft @ 2000 316 lb-ft @ 2400
    Intake Seat diameter 1.879" 1.938" 1.879" 1.879" 1.938"
    Intake Head diameter 1.969" 2.078" 1.969" 1.969" 2.078"
    Intake Stem diameter .3725" .3725" .3725" .3725" .3725"
    Lift .440" .440" .440" .440" .440" .440"
    Open (before TDC) 18 degrees 18 degrees 21 degrees 21 degrees 21 degrees
    Close (after BDC) 58 degrees 58 degrees 63 degrees 63 degrees 63 degrees
    Exhaust Seat diameter 1.539" 1.664" 1.539" 1.539" 1.664"
    Exhaust Head diameter 1.609" 1.734" 1.609" 1.609" 1.734"
    Exhaust Stem diameter .375" .4145" .375" .375" .4145"
    Lift .395" .395" .395" .395" .395" .395"
    Open (before BDC) 58 degrees 58 degrees 58 degrees 58 degrees 58 degrees
    Close (after TDC) 18 degrees 18 degrees 18 degrees 18 degrees 18 degrees
    Seat Insert None Alloy None Alloy Alloy
    Firing Order 1-3-4-2 1-3-4-2 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2 1-8-4-3-6-5-7-2
    Carburetor 1940 Holley 2300 Holley 2210 Holley Carter Thermoquad Carter Thermoquad
    Fuel Delivery 27 gph @ 4000rpm 27 gph @ 4000rpm 27 gph @ 4000rpm 27 gph @ 4000rpm 27 gph @ 4000rpm 27 gph @ 4000rpm
    Fuel Pressure 4.5 – 5.75 psi 4.5 – 5.75 psi 4.5 – 5.75 psi 4.5 – 5.75 psi 4.5 – 5.75 psi 4.5 – 5.75 psi
    Oil Capacity (dry) 6 qt 6 qt 6 qt 6 qt
    Oil Pressure (idle) 10 – 20psi 5 – 10 psi 5 – 10 psi 5-10 psi 5 – 10 psi
    Oil Pressure (4000rpm) 40 – 50 psi 50 psi 40 – 50 psi 50 psi 50 psi 50 psi

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    About jimhadfield

    Retired and enjoying it.
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