High compression engine problems
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The test pieces for the discs were cut from the engine cylinder liner (high phosphorus cast iron) and then machined in the form of circular disc of diameter 24 mm and thickness of 9.8 mm (outer ...
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In this condition, power developed by the engine will reduce and whatever fuel is burnt will be wasted due to afterburning resulting in high exhaust temperature but low power. Q.445 Increase in compression ratio of a diesel engine while maintaining designated rate of fuel flow will result in . …
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A compression ratio in the order of 75:1 is obtained, with pressure in the compression cylinder equal to that of a conventional engine during combustion. The pressure in the compression cylinder and the crossover passage reach more than 50 bar (725 psi) on our naturally aspirated (NA) engine and more than 130 bar (1885 psi) on our turbocharged ...
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spark knock problems with high compression engines Spark knock problems may be encountered with high compression engines. If engine parts were “mixed and matched” from different suppliers, the actual compression ratio may differ substantially from the expected value.
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Pratt & Whitney solved this problem in 1948 with its "dual spool" concept. This combined two engines into one. The engine had two compressors—each rotated independently, with the inner one giving high compression for good performance. Each compressor drew power from its own turbine; hence there were two turbines, one behind the other.
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As a fuel, natural gas works best in an engine system with low emissions. Engines can operate with a high compression ratio as its octane number is high because of its fast flame speed. Its disadvantages are: low energy density resulting in low engine performance; low volumetric efficiency; requires large pressurised fuel storage tank.
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5. Engine displacement = piston displacement × number of cylinders. a. Displacement can be altered by changing cylinder bore, piston stroke length, or the number of cylinders. 6. Compression ratio compares cylinder volumes with piston at BDC and TDC. a. Maximum cylinder volume is at BDC. b. Minimum cylinder volume is at TDC.
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But a diesel engine uses heat from compression to ignite the air fuel mixture, and this high compression requires high injection pressures. What has been done on the PowerStroke is both of these systems are used in conjuntion with each other. Fuel is supplied to the injectors through fuel rails inside the cylinder heads.
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From compression ratios of 9.5/1 upwards there are high rates of pressure rise which have their origin in the additional flame fronts started form surface deposits in the cylinder. At about 9.5/1 compression ratio the low frequency engine vibration produced are called rumble or pounding.
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The problems with the hot residual gas could basically be reduced through an increase of the compression ratio (to 10:1 and 11:1). This measure, however, is contradictory to supercharging. 4.3
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