How To Tune Your Vintage Mustang for Improved Performance
There are a couple ways to perform a cylinder-leakdown test. Jon's people do it the old-fashioned way, which works quite well. Compressed air is administered to each cylinder at compression stroke with both valves closed. If the piston moves to bottom dead center and pressure holds, cylinder sealing is satisfactory. If noise can be heard through the intake or at the exhaust, valve-to-seat sealing may be unacceptable. If noise is heard through the oil filler tube, piston-ringntoncylinder-wall sealing may be poor. View Related Article
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