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Mechanical vs. Hydraulic valve lifters.....
Posted by REM in Seattle (more from REM in Seattle) on Thu, 12 Jul 2001 10:37:00
In Reply to: Valve Adjustment Question, Stephen, Thu, 12 Jul 2001 08:36:36
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My 1984 SAAB 900T and my 1991 Alfa Romeo Spider both use mechanical valve lifters requiring adjustment every 30,000 miles. My 1984 Jeep CJ7 and 1998 SAAB 900SET both use hydraulic lifters and require no adjustment.
Mechanical lifters were used for many years. The main advantages were that being solid, they were more accurate at setting the valve gap and the mechanical lifters would not collapse at high RPMs like the older hydraulic lifters. Disadvantages were the periodic need to adjust for wear and the additional valve train (the characteristic 'tapping') noise of metal on metal.
Hydraulic lifters have also been used by the automotive industry for many years for several good reasons. Compared to a mechanical lifter, the hydraulics are quieter, lower maintenance (self adjusting), ability to adjust for thermal expansion of the engine, built in shock absorber(eases stress on valve train).
Modern hydraulic lifters can be used for street applications and high performance applications where low maintenance is a primary concern. Advances in hydraulic lifters have enable them to overcome the high RPM collapse problems and to avoid hydraulic lifter 'pump-up' that used to be the main problems.
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