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Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve their air flow. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to being designed for maximum durability. Ports can be modified for maximum power, minimum fuel consumption, or a ...
The original price for the 16 hp (12 kW) version was $70 lower (at US$228) than their single-cylinder cast-iron version bearing the same power rating. [ 18 ] Industrial/Commercial (I/C) – This series of engines, initially ranging from 3 to 20.5 hp (15.3 kW), was introduced in 1979 as Briggs & Stratton's answer to high quality commercial-duty ...
De Dion-Bouton engine with monobloc cylinder heads, but cylinders separate from crankcase c. 1905 [1]. A monobloc or en bloc engine is an internal-combustion piston engine some of whose major components (such as cylinder head, cylinder block, or crankcase) are formed, usually by casting, as a single integral unit, rather than being assembled later.
The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft.
Briggs engineers had worked out how to replace the standard heavy cast iron bathtub. They used their expertise in deep draw metal stamping and the machinery for making car fenders. The new bathtub was stackable and about one-quarter of the weight of the cast iron product. The Briggs family kept Beautyware and did not sell it to Chrysler in 1953.
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 ...
This design dates back to 1940, when it was introduced in the Nash 600 as an L-head 172.6 cu in (2.8 L) engine. Displacement was increased over the years to 184 cu in (3.0 L), and finally to 195.6 in the early-1950s. The block casting was changed to allow an OHV head for the 1956 Rambler (the L-head was discontinued).
The L20 has a cast-iron block and power output is 260–302 hp (194–225 kW) while torque is 295–305 lb⋅ft (400–414 N⋅m). The Vortec 4800 base engines were dropped from the Chevrolet Tahoe and GMC Yukon in favor of the 5300 with Active Fuel Management.