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The exhaust valves have stellite faces and the connecting rods have a 0.125 in (3 mm) hole drilled in the rod cap to improve lubrication. The pistons have three rings and smaller piston pins. [1] [2] A75-1 A75-2 A75-3 A75-4 A75-5 A75-6 A75-14 A80 80 hp (60 kW), Compression ratio 7.55:1, max rpm 2,700, fuel consumption at cruise 5.2 US gph.
The cylinders have air-cooled heads cast from aluminum alloy with a fully machined combustion chamber. [ 1 ] [ 3 ] The first IO-720 was type certified on 25 October 1961 to the CAR 13 standard as amended to 15 June 1956 including 13-1, 13-2, 13-3, 13-4.
Ironically, the over-bore limit of 1 mm is also stated in the paper with the correct resultant displacement of 1,595 cc (83.55 mm x 72.75 mm, 1,595.42 cc). [ 11 ] The cylinder head has hemispherical combustion chambers (correct statement would have been "pear shaped chambers" since this has implications on the angle of the valves).
This engine used cast-iron cylinder liners and a cast-iron head. The cylinder heads for the two types of block (aluminum and cast iron) have similar designs but are not interchangeable. The cylinder head for the aluminum block is roughly 1/8" wider than that for the cast-iron block and uses a slightly different head bolt pattern. [9]
All M112 engines have silicon/aluminum (Alusil) engine blocks with a 90° vee angle. The aluminum SOHC cylinder heads have 3 valves per cylinder. All use sequential fuel injection with two spark plugs per cylinder. All have forged steel connecting rods, a one-piece cast camshaft, iron-coated aluminum pistons and a magnesium intake manifold.
The main advantage of the reverse-flow cylinder head is that both the entering inlet charge and the exiting exhaust gas cause a tendency to swirl in the same direction in the combustion chamber. [1] In a crossflow head the inlet and exhaust gases promote swirl in opposite directions so that during overlap the swirl changes directions.
The ZZ series uses a die-cast aluminium engine block with thin press-fit cast iron cylinder liners, and aluminium DOHC 4-valve cylinder heads. [1] The camshafts are chain-driven . The two 1.8 L members of the family, the 1ZZ and 2ZZ, use different bore and stroke .
The crankcase is made of aluminum alloy. [1] Ranger manufactured the cylinder barrels from rough alloy steel forgings, while the pistons were machined from aluminum alloy castings, and the connecting rods were machined from chromoly steel forgings. The alloy steel forging camshaft was bolted to the cylinder heads, and driven by a vertical drive ...
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