Quote:
Originally Posted by CompClassics
Blykins,
What is your thought on running a hydraulic cam profile using mechanical roller lifters? Longevity?
|
Same deal.
Any solid lifter will need lash and more spring pressure to keep the valvetrain happy. When you introduce lash into the system, then the lifter is not in contact with the cam lobe all the time. Add spring pressure to that and you get a hammering effect on the lifter's roller bearings. Over time, it hammers them down. Even the most expensive lifters made for "street use" will not last a long time.
With the amount of research that I've done on hydraulic roller cams in the past several years, there's no need to run a solid roller unless it's a race application where aggressive cam lobes are necessary. I've had my FE engines at 7500 rpm with a hydraulic roller camshaft.