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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 ...
This requires that the intake and exhaust ports be at opposite ends of the cylinder. As used by some two-stroke engines, the fresh charge enters through piston-controlled ports near the bottom of the cylinder and flows upward, pushing the exhaust gases out through poppet valves located in the cylinder head.
The 2.5 L (2488 cc) PR25DD has a bore and stroke of 89 mm × 100 mm (3.5 in × 3.9 in) with a compression ratio of 12.0:1. [3] Compared with its predecessor, the QR25DE, it has an increased compression ratio, iron mirror-finish bore coatings instead of cast-iron cylinder liners, and a resin intake port insert to insulate charge air from heat from the cylinder head.
Originally developed in 1959 for the Ford Anglia, it is an in-line four-cylinder overhead valve (OHV) pushrod engine with a cast-iron cylinder head and block. The Kent family can be divided into three basic sub-families; the original pre-Crossflow Kent, the Crossflow (the most prolific of all versions of the Kent), and the transverse mounted ...
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]
It has a cast iron engine block, and aluminium DOHC cylinder heads. The 5VZ-FE uses sequential multi-port fuel injection , has four valves per cylinder with shim-over-bucket tappets and features large cast connecting rods, one-piece cast camshafts, a cast crank (unlike the 3VZ-FE, which was forged) and a cast aluminium intake manifold.
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