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The pistons were a pent-roof type, and the combustion chamber shape approximated a hemisphere. The compression ratio was 10.5:1. The compression ratio was 10.5:1. While claimed output was as high as 240 hp (179.0 kW) at 7200 rpm, none of the three prototype engines developed more than 190 hp (141.7 kW) at 5700 rpm and 170 lb⋅ft (230 N⋅m) at ...
Its design shared much with the L29 454, but with the addition of forged pistons and crankshaft, and coil near plug ignition. It had slightly reduced power compared to the L29 454 and used a different PCM. The L21 was paired with the early 4-speed Allison automatic transmission or manual transmission, depending on the application. L21 applications:
TRW Automotive was an American company based in Livonia, Michigan.Tracing its roots from TRW Inc., [2] [3] TRW Automotive's production featured a variety of automotive products including integrated vehicle control and driver assist systems, braking systems, steering systems, suspension systems, seat belts and airbags, and engine valves among others. [4]
The pistons used in the 4.3 L V8 were the same as the Vortec 5000's, but longer 5.94 in (150.9 mm) connecting rods were used to compensate for the shorter stroke. The L99 featured updated Generation II block architecture, and is externally identical to the larger 5.7 L LT1 Generation II V8.
Piston. 1931–1944 Allison V-1710; 1937–1944 Allison V-3420 (derived from the V-1710) Propfan. 1987–1989 *Allison 578-DX; Turboprop. 1947–1950s Allison T38;
This makes hypereutectic pistons a better choice for stock engines, where longevity is more important than ultimate performance. Some vehicles do use forged pistons from the factory. Dodge Vipers used forged pistons from 1992-1999 model years, then switched to hypereutectic. The last generation of Vipers (2013-2017) used