Need simple info about burnt valves and collapsed lifters.
09-07-2003, 11:14 PM
#1
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Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
Need simple info about burnt valves and collapsed lifters.
Just a couple of things I need to learn.
1) What does it mechanically mean...
2) What causes...
3) What are symptoms of...
Burnt valves and collapsed lifters.
Thanks!
1) What does it mechanically mean...
2) What causes...
3) What are symptoms of...
Burnt valves and collapsed lifters.
Thanks!
09-08-2003, 01:53 AM
#2
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Burnt valves: No longer sealing cylinder pressure because of heat damage to either the valve or head sealing surface. Caused by worn guides/valve stems, sticking valves in guides, carbon build-up on sealing surfaces, or perhaps lean mixture or pre-ignition. Usually its the exhaust valves that "burn".
Collapsed lifter: Hydraulic lifter that does not properly remove valve lash when running up the cam lobe ramp. Basically, the plunger bottoms out in the lifter body instead of being "locked" hydraulically as the lifter starts to move up. Usually caused by dirt, but also may be from over-reving and damaging the lifter internals.
Collapsed lifter: Hydraulic lifter that does not properly remove valve lash when running up the cam lobe ramp. Basically, the plunger bottoms out in the lifter body instead of being "locked" hydraulically as the lifter starts to move up. Usually caused by dirt, but also may be from over-reving and damaging the lifter internals.
Last edited by five7kid; 09-08-2003 at 01:56 AM.
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