A hydraulic roller FE turning 7500 rpm....

[66AC]

Brent:
Thanks for the info about the high RPM FE.
With no adjuster on the lifters, how does one set or specify the OAL of the lifter rods?

The higher RPMs brings to mind one thing... what limitation does that reveal? In other words, what part of the engine design modification is next? Head design for instance?

In general, I pretty much never get above 5K rpms in my use of the Cobra.
Would this design coupled with titanium as the material even get higher RPMs?

Thanks for sharing.

[blykins]

Originally Posted by 66AC

Brent:
Thanks for the info about the high RPM FE.
With no adjuster on the lifters, how does one set or specify the OAL of the lifter rods?

The higher RPMs brings to mind one thing... what limitation does that reveal? In other words, what part of the engine design modification is next? Head design for instance?

In general, I pretty much never get above 5K rpms in my use of the Cobra.
Would this design coupled with titanium as the material even get higher RPMs?

Thanks for sharing.

You have to measure for pushrods. It’s the same method as when you use factory non adjustable rockers.

The rockers themselves will not make an engine pull higher unless the engine is already cammed for it and the valvetrain simply won’t let it get there.

Obviously not every FE needs to be a 7500 rpm engine but I did that to prove that FEs can get up there and to prove that my rockers are stout enough to support it.

The rockers would make a nice choice for any FE. Not having an adjuster makes it lighter and eliminates another part that can fail.

[Kit Coyle]

Many thanks to Brent and all the other professional mechanics who contribute
their time and knowledge. For me, the very best part of this website are these
mechanical tutorial threads.

[blykins]

Morel, Crower, Jesel, Isky.

[Whodeeny]

Originally Posted by blykins

Morel, Crower, Jesel, Isky.

Thanks Brent.

Comp Cams has a mechanical roller lifter (96836B-16, $1000 for 16 lifters!) that replaces the needle roller bearings with a bronze bushing. Any experience with using this lifter?

[blykins]

I don’t run Comp lifters.

If you don’t plan on being over 6000-6500, there is no reason to run a solid roller on the street and take the risk.

[Kit Coyle]

My Cobra has a 1970 BOSS 302 Cleveland engine with a solid lifter cam and
lifters built in 2006 with new pistons in 2012. This thread has raised solid lifter longevity concerns so I thought I would run this by everyone to see where I stand. The block, crank, rods, heads and intake manifold are 1970 BOSS 302.
The pan is Milodon road race with windage tray. The cam is a Chrane solid
roller with duration 230/238 @ .50. Adv. duration is 280/288. Intake @ .50
opens 8.0 BTDC closes 42.0 ABDC. Max lift 107 duration 230. Exhaust opens
56.0 BBDC closes 2.0 ATDC. Max lift 117. Duration 238. Spring pressures
145 closed 345 open. Trick flow pushrods. Harland-Sharp roller rockers.
17,000 miles on engine with new pistons at 12,000. I am told heads must
be removed on this block to access lifters to check them. No bad noises
using stethoscope. Very strong engine. How radical is my cam and where do
you see my vulnerability and what can I do to mitigate future problems.
Thank you very much.