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The number of main bearings is primarily determined by the overall load factor and maximum engine speed. [1] Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also reduces bending stress and deflection caused by the distance from the crank pins to the nearest bearings.
The two main oil galleys in the 335 series engine run along the lifter bores. Oil is fed from the filter to the number one main bearing followed by the number one cam bearing above. At the same time, it also feeds the right hand oil galley, supplying the right side lifter bank. It has four galleries that lead to each of the remaining main bearings.
In some older engines (such as the Chevrolet Gen-2 "Stovebolt" inline-six, the GMC straight-6 engine, the Buick Straight-eight, and the Chrysler "Slant 6") the bore pitch is additionally extended to allow more material between the main bearing webs in the block. For example, in an L6 the first pair (#1 & 2), center pair (#3 & 4), and rear pair ...
The engine block had 4.84-inch (123 mm) bore centers, two-bolt main bearing caps, a "side oiling" lubrication system (the main oil gallery located low on the driver's side of the crankcase), with full-flow oil filter, and interchangeable cylinder heads. Heads used on the high performance 409 and 427 engines had larger ports and valves than ...
A version with two spark plugs per cylinder, distributor-less ignition, and reduced main bearing sizes was introduced in the 1989 Ford Ranger and 1991 Ford Mustang. This engine produced 105 hp (78 kW) and 183 N⋅m (135 lb⋅ft). Applications. Naturally aspirated 1986–1987 Ford Aerostar; 1977–1982 Ford Courier; 1974–1980 Ford Pinto
The original OHV three main-bearing Kent engine appeared in the 1959 Anglia with a capacity of 1.0 L (996.7 cc) developing 39 bhp (29 kW) at 5,000 rpm — unusually high for the time. With a 80.96 mm × 48.41 mm (3.19 in × 1.91 in) bore and stroke, combined with independent (non-siamesed) four intake and four exhaust ports, it was a departure ...
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