This edition of the thesis aims to study the effect of adjusting the compression ratio in a diesel engine. One cylinder. 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. The test is made engines modifications and 1000 1500 2000 2500 3000 revs. Revolutions per minute. With the burden of a 25% to 50%, and 75% of standard engines, respectively, and compared the test results between the standard engine 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 by, and have a maximum of 24:1 compression ratios at 2000 RPM is a powerful thermal cycles and maximum rate of consumption of low specifications of 20:1 compression ratios between the standard engine with engine modifications, engine modifications, found that the thermal efficiency is higher than the standard engine, the burden of low-speed low-load is the load range by 25%, from around 1000-2300 RPM. The burden of load of 50% from around 1000-1500 rpm. After that, the burden of load 75% more efficient than standard engine, the engine speed range, adapted due to the effect of fuel injection in the combustion chamber that come to different sizes.
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