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Abstract:A quantitative, periodic motor vehicle safety- inspection test for determining the leakage rate of engine exhaust from an automotive exhaust system was investigated. Two technical approaches were evaluated, and the better one was selected for development of necessary special equipment and test procedures. The results of the measurement are expressed as the diameter of a single round hole, equivalent in leak age rate to the sum of all leaks in the exhaust system being tested. This method is capable of measuring leaks equivalent in size down to about a 1/16-inch hole; discrimination between leaks of 1/8-to 1/2-inch diameter is reliable and easily achieved. Total time to conduct a test and evaluate results is estimated to be from 2 to 5 minutes. In addition, the test imposes a reproducible pressure stress on each system tested; this provides reasonable assurance that the system will remain structurally intact until the next inspection period without developing catastrophic leakage. A field test kit has been developed which can accommodate engine displacements to 460 cubic inches. Flow calibration data are given. A detailed test procedure complete with leak-size de termination graphs and a calculation nomograph is presented in an appendix.
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