This edition of the thesis aims to study the effect of adjusting the compression ratio in a diesel engine. The combustion chamber is open combustion chamber cylinder, volume down, and extra conditioning cylinder compression ratios into the cylinder makes it possible to adjust the compression ratio between 4:1 to 24:1. make a test engine modifications and 1000 1500 2000 2500 3000 revs. Revolutions per minute. With the load of the engine, 25%, 50% and 75% of the original engines, respectively, and compared the test results between the original engines with engine modifications, the same compression ratios. To study the thermal performance. The fuel consumption rate of each compression ratiosThe study found that increasing the compression ratio, higher thermal efficiency is increased and the highest compression ratio 24:1 at 2500 rpm, with a value of 38.7%, is a powerful thermal cycles and maximum fuel consumption rate, the minimum specifications. There are 161 ppm nitrogen oxide values for comparisons between the original engine with a modified engine compression ratios of 20:1, found that the engine modification, thermal efficiency is higher than the original engine, the financial burden of low engine revs low is 25% reload speed range 1000-2300 RPM. The burden of a 50% speed engine around 1000-1500 rpm. After that, the burden of 75% of the original engine, engine efficiency is higher than the engine speed range, adapted due to the effect of fuel injection in the combustion chamber that has a different size.
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