Solid roller lifters

Cudafever said

In simple terms that make sence.
but at 7500 rpm, that rocker arm is beating the crap out of the valve stem, and the cam is doing the same thing to the roller lifter.
7500 times a minute compared to to 800-1200 time a minute.
Is there just not enough oil flinging around for proper lube at idle? Maybe the reason for pressure feed rollers on the lifter???

Click to expand...

It's an issue of TIME. We need to account for time. Like the analogy above about the rough road, or it's the same with a dirt bike...faster over the rough stuff can make it smoother. Of course, if you screw up you get some quality sheet time at your local hospital.

That said, at lower RPM's the roller tends to skid rather than roll. Rockers suffer the same issue. As the RPM goes up, everything happens quicker and it tends to smooth thing out...until you get spring surge, valve float or seat bounce.

Also, guys have a hard on to keep oil pressure and flow at idle to damn near nothing. While you may save a few HP, that lack of pressure and flow is a killer on splash fed lifters. Even SFT lifters. I never let an engine of mine idle under 1000 and 1200 is better. Guys also like to brag their stuff with a 270 @ .050 cam will idle at 600 RPM in gear. What they don't get is they are just killing parts.

Splash oiling is ok if you don't monkey see-monkey do like other guys with different requirements than a Chrysler.