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Number of cylinders: 8
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Cylinder Block Piston Rings |
Material | Comp Ratio | Max BHP | Max Torque | Compression Pressure | No. Studs | Volume |
Aluminum | 6.6 | 60@3500RPM | 94@2500RPM | 158lbs. @2800 RPM Max 116 lbs @ cranking speed |
17 | 41-43 c.c |
Cast Iron | 6.6 | 60@3500RPM | 94@2500RPM | 158 lbs. @2800 RPM Max 116 lbs @ cranking speed |
17 | 41-43 c.c. |
Material | Dome | Skirt | Weight (Grams) | Fit of Piston in Cylinder (Using 0.50" Wide Feeler) | Ring Groove Width | ||||
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Thickness of Blade | Top | Center | Bottom | ||||||
Hardened Sleeve Bore | Plain Bore | Pounds Pull | .095" | .0945" | .1575" | ||||
Steel | Spherical | Solid | 226-231 | .0025" | .002" | 7-12 |
Oil Control Ring Crankpin Bearing Inserts |
Crankshaft Counter balanced 90 degree type. Cast alloy steel. Length overall 1937-1939...... 20.82" Length overall 1940................ 22.88" Crank Pin Journal Diameter 1937-1939............................. 1.599" 1940...................................... 1.699" Length 1937-1939.................. 1.54" Length 1940............................ 1.408" Main Bearing Journal Diameter 1937-1939.............................. 1.999" 1940........................................ 2.099" Length front............................. 1.622" Length center........................... 1.648" Length rear.............................. 2.002" Weight 1937-1939.................. 44.9 lbs. Weight 1940........................... 40.5 lbs. Endplay.................................. .002"-.005" Main bearing inserts length Front and center...................... 1.510" Rear........................................ 1.999" Wall thickness......................... .0855" Piloted cap no shims. |
Flywheel and Starter Gear Engine Specifics |
Valves Mushroom stem. Lifter non adjustable, hollow cast. Valve, guide, and spring removable as an assembly. Valve seat inserts (molybdenum chrome ally steel) for exhaust. Valve material high chrome silicon alloy steel. Diameter of head.................... 1.281" Diameter of stem.................. 0.2795" Diameter of stem end.............. 0.460" Diameter of seat angle................. 45° Diameter of lifter................... 0.8295" Lift of cam.............................. 0.251" Spring length valve closed......... 2.05" Pressure valve closed.......... 26-30 lbs. Pressure valve open............ 48-52 lbs. Stem clearance............. .0015"-.0035" Valve clearance................ .011"-.012" Valve Timing Intake opens BTC.......................... 9.5° Intake closes ABC....................... 54.5° Exhaust opens.............................. 57.5° Exhaust closes................................ 6.5° |
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