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A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...
An oil pump, a vane or gear pump powered by the engine, pumps the oil throughout the engine, including the oil filter. Oil filters can be a full flow or bypass type. In the crankcase of a vehicle engine, motor oil lubricates rotating or sliding surfaces between the crankshaft journal bearings (main bearings and big-end bearings) and rods ...
The Polyspheric or Poly engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to the Hemi engines. [1] These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons.
The older flathead engine design uses a "bathtub"-shaped combustion chamber, with an elongated shape that sits above both the piston and the valves (which are located beside the piston). IOE engines combine elements of overhead valve and flathead engines; the intake valve is located above the combustion chamber, while the exhaust valve is ...
For 1997, the 3.9 L engine's torque output was increased to 225 lb⋅ft (305 N⋅m), with a compression ratio of 9.1:1. [8] Firing order was 1-6-5-4-3-2. [8] This engine was last produced for the 2003 Dodge Dakota pickup. Starting in the 2004 model year, it was entirely withdrawn from production and replaced with the 3.7L PowerTech V6 engine.
The 277 "Hy-Fire" was the first A-block engine, produced for 1955 in the fall of 1954 and sharing almost nothing but the basic concepts with other engines built by Chrysler. Bore is 3 + 3 ⁄ 4 in (95.3 mm) and stroke is 3 + 1 ⁄ 8 in (79.4 mm; 3.13 in) for a piston displacement of 276.1 cu in (4,525 cc).
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