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techtalk:ref:svcproc20 [2024/01/21 21:21] hippysmack |
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| * The compression tester has a one-way valve in it's hose, allowing it to see the pressure of the compression stroke\\ but not relieve it on the other strokes. Additional strokes that produce higher pressures will increase the\\ reading of the gauge. | * The compression tester has a one-way valve in it's hose, allowing it to see the pressure of the compression stroke\\ but not relieve it on the other strokes. Additional strokes that produce higher pressures will increase the\\ reading of the gauge. | ||
| - | * Always look for a compression tester that has it's check valve as near to the chamber as possible. Otherwise, you're\\ adding the volume of the hose (up to the check valve) to the chamber volume which causes the compression reading\\ to be lower, because the piston is trying to fill that hose space as well as the chamber. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=26208&page=2)) | + | * Always look for a compression tester that has it's check valve as near to the chamber as possible. Otherwise, you're\\ adding the volume of the hose (up to the check valve) to the chamber volume which causes the compression reading\\ to be lower, because the piston is trying to fill that hose space as well as the chamber. ((aswracing of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/15672-four-strokes-and-leak-down-compression-tests-how-they-work/page2?t=26208&page=2)) |
| * A proper compression test should be done with the engine close to normal operating temperature, when possible. ((79-85 HD XL/XR FSM pg 3-10)) | * A proper compression test should be done with the engine close to normal operating temperature, when possible. ((79-85 HD XL/XR FSM pg 3-10)) | ||
