10-11-2011, 02:51 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Quote:
Originally Posted by xb-60
Thanks Brent. So when you say the lifters take a pounding, that's only if the clearances aren't maintained to correct limits? If clearances are correct, and 7500 - 10000 mile intervals isn't a deal-breaker, then no other down side?
What precentage of motors do you build that have solid roller lifters?
Cheers,
Glen
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No, they take a pounding just by nature. With a hydraulic lifter, there's lifter preload. The lifter is in constant contact with the lobe and the hydraulic internals absorb a lot of the action. With a solid lifter, there's valve lash, which is extra clearance between parts. If a high quality solid roller lifter was in constant contact with the lobe, it would probably last an extremely long time. However, with valve lash and no hydraulics to dampen the system, the "slop" in the valvetrain exposes the lifter bearings to a "shock" load when it re-contacts the lobe.
I'd say about 30% of my engines are solid roller engines. |
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