JSM Posted August 13, 2017 Share Posted August 13, 2017 (edited) I've got a turbo junk yard motor I wanted to check out before bothering to install and wanted to do a leak down test on it. I have heard the process is to set it at TDC on the compression stroke for each cyclinder, but can someone tell me why it really matters? If the piston is at its apex regardless of cycle, both valves are closed. Edited August 14, 2017 by JSM Quote Link to comment Share on other sites More sharing options...
Chickenman Posted August 14, 2017 Share Posted August 14, 2017 Nope. On exhaust/ Intake stroke you have valve overlap at TDC. Even on stock Cams. Quote Link to comment Share on other sites More sharing options...
JSM Posted August 14, 2017 Author Share Posted August 14, 2017 Thank you. Quote Link to comment Share on other sites More sharing options...
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