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The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways.
A link between a gas turbine compressor and its engine can be shown with lines of constant engine temperature ratio, ie the effect of fuelling/increased turbine temperature which raises the running line as the temperature ratio increases. One manifestation of different behaviour appears in the choke region on the right-hand side of a map.
The Pratt & Whitney TF30 used on the F-111 had a pressure ratio of about 20:1, while newer engines like the General Electric F110 and Pratt & Whitney F135 have improved this to about 30:1. An additional concern is weight. A higher compression ratio implies a heavier engine, which in turn costs fuel to carry around.
Diesel engines have a compression/expansion ratio between 14:1 and 25:1. In this case the general rule of higher efficiency from higher compression does not apply because diesels with compression ratios over 20:1 are indirect injection diesels (as opposed to direct injection). These use a prechamber to make possible the high RPM operation ...
Power output was 300 hp (224 kW) SAE and 380 lb⋅ft (515 N⋅m) torque. Compression ratio was 10.25:1. The compression ratio of the L48 was lowered to 8.5:1 in 1971. In 1972, the L48 (four-barrel V8) option for the Nova was part of the SS package.
This engine is also known as a A28NET, Z28NET, Z28NEL or B284. The LP9 is a 2.8L turbocharged version used for the Saab 9-3, Saab 9-5, and other GM vehicles. It has the same bore and stroke as the naturally aspirated LP1, however the compression ratio is reduced to 9.5:1. The engine is manufactured at Holden's Fishermans Bend engine factory in ...
This engine features a square 83 mm (3.27 in) bore and stroke with a 10.0:1 compression ratio. This engine was built at the Trenton Engine Plant for use in export market (non-US) Chrysler Neons. It produces 86 kW (115 hp) at 5750 rpm and 151 N⋅m (111 lb⋅ft) at 4950 rpm and meets Euro III emission standards. Applications:
Compression ratio: 17.2:1 Emissions control : Electric fuel control The 5.9 L; 359.0 cu in (5,883 cc) ISB ( I nteract S ystem B ) is one of the largest straight-six engines used for light truck vehicles and school buses , and the improved high output 600 version was on the Ward's 10 Best Engines list for 2004.
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