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The DeSoto and Dodge 270/315/325 poly used similar head architecture but was not related to the Plymouth A Engine, using its own heads and the same bottom end as the Dodge and Desoto Red Ram Hemi. The A engine cylinder bore center distance is 4.46 in (113.3 mm), larger than the earlier Dodge-based poly engines.
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.
Water-cooled engines, such as the GTI 16-valve four, VR6, or 1.8 T are commonly swapped into the Mark II GTI, Jetta, and Corrado. Less common is the swap into a Mark 1 Golf or Cabriolet, giving an amazing power-to-weight ratio, even with minimally modified powerplants. Porsche engines are also very popular.
Chrysler developed its first experimental hemi engine for the Republic P-47 Thunderbolt fighter aircraft. The XIV-2220 was an inverted V16 rated at 2,500 hp (1,860 kW). The P-47 was already in production with a Pratt & Whitney radial engine when the XIV-2220 flew successfully in trials in 1945 as a possible upgrade, but the war was winding down and it did not go into production.
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 ...
U.S. Senator Chris Van Hollen has introduced legislation seeking to halt American weapons sales to the United Arab Emirates until the United States certifies that the UAE is not arming the ...
Wards 10 Best Engines is an annual list of the ten "best" automobile engines available in the U.S. market, that are selected by Wards AutoWorld magazine. The list was started in 1994 for model year 1995, and has been drawn every year since then, published at the end of the preceding year.
The review will be guided by a pair of recent U.S. Supreme Court decisions that placed significant limits on agencies' rulemaking powers, they said. DOGE will present its findings to Trump, who ...
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