4.0 OHV roller rockers being developed by Harland Sharp

[93sploderxlt]

Just in case anyone is interested I talked to Harland Sharp ( www.harlandsharp.com )yesterday and he is in the process of making a shaft roller rocker setup for the 4.0. Its in the development stage but he hopes to have it ready in about a month. i think he'd like a little backing, so contact him if interested maybe itll bring his initial est. cost down.

 

[Rick]

Thanks for the heads up. I'm interested!

 

[Creager]

What would be the benefit of roller rockers in an OHV? Will it give more valve lift? Maybe keep your pushrods in better shape longer?

I may be interested, i remember reading about other companies doing this, i think Doug904 used to sell some, but i didnt read about any accounts of performance gains from them...

 

[Rick]

Frees up a bit of power and can raise the RPM before valve float if you have good springs. Lift would be dependent on ratio. We'll need to see what ratios they will offer.

 

[93sploderxlt]

Probe Industries was the first company that made the setup but they have since abandoned them unless you can come up with a bulk order of 100 sets is what i was told. The ratio is gonna be 1.6. I have a friend who used to be an engine builder for a busch team and he said the best gain you could see would be with the 1.6 without any valve/piston interference but if it was possible to make the intake 1.6 and exhaust 1.5 ratio. As far as performance goes if you have any machining or major work not just a few bolt-ons its gonna free up some HP ,operate at a higher RPM with less stress on the engine and quite frankly ford shoulda done a long time ago especially with the pushrod combination on the stock engine

 

[Runnin'OnEmpty]

Looks like these might solve the pushrod tip wear problem, that these engines are famous for.....?

 

[Creager]

Looks like these might solve the pushrod tip wear problem, that these engines are famous for.....?

On second thought, i dont see how they would solve this problem just as roller rockers alone, unless they built-in some design for better oiling to the pushrod sockets. Maybe they will do something simular to what Delta-cams did.

I wonder if these will work with the OEM rocker-shafts, or do they redesign that too?

These with a set of rocker-spacers to replace the spings will free up the valvetrain a nice little bit.

 

[Rick]

These are just examples from other shaft motor applications.