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bob_wbstr
- 6
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I am now 76 years old but as a young man I served an apprenticeship with a well known motor manufacturer and we apprentices were able to carry out experiments on engines in testbeds that were connected to dynamometers. In one such experiment we attached a straight length of pipe to the air intake of an engine which caused the engine to speed up and/or produce more power. The length and diameter of the pipe was critical.I understand that what we observed was called the ram effect whereby the speed of the air in the pipe was forced to increase for some reason and adjustments were needed to the air fuel ratio to take advantage of this.Is anybody able to tell me any more about this and why the speed of the airflow in the pipe should become faster? Also how the length and diameter of the pipe would have been calculated?Many thanksBob