Roller Rockers?

RoadWarrior · Jul 2, 2011

For the guys that do engine builds and high hp mods all the time, i want to have your thoughts on what you think about roller rockers from harland sharp? Are they a good investment? Do they make any difference? Has anybody even tried them?

Big Bore · Jul 2, 2011

Paging HRT...

Gearhead · Jul 2, 2011

A 1.7 ratio rocker would be tits.

RoadWarrior · Jul 3, 2011

True that Gearhead.

Chvyrkr · Jul 3, 2011

Talkin with Jason about them, I don't think he recommends DD'ing on them. Unless you like adjusting the valves once a month.

As far as performance, I haven't heard very many 7.3's sound as clean at 4000+ RPM's as his old red truck did in his vids.

Maybe Jim Leggs truck, but I have no clue what's done to that engine.

RoadWarrior · Jul 3, 2011

Im not really planning on spinning the motor that fast. Im just looking every place i can to free up friction. Less friction= more hp. Do you think the valves would need be adjusted often if the enigne was just used for mild street use? say 500hp

Chvyrkr · Jul 3, 2011

It's the design of the rocker itself that will wear and mandate the constant valve adjustments. If you drive it alot on roller rockers, you'll need to adjust them. A lighter spring might slow the rate of wear, but factory rockers would probably suffice on the variety of lighter springs available.

And your choice of valve spring is going to have much more to do with the amount of friction than the rockers.

RoadWarrior · Jul 3, 2011

I want to run my boost about 30 to 40 sooner or later. What would be a good set of spings that i should get?

Chvyrkr · Jul 3, 2011

Lots of variables, but there are a ton of people running Comp 910 springs at those boost levels with no apparent issues.

RoadWarrior · Jul 3, 2011

Ok, thank you. I appreciate the input

Whytry · Jul 3, 2011

I think hotrodtractor ha them didn't he?

Chvyrkr · Jul 3, 2011

Yes, Jason (HRT) has them.

That's who I was taking about.

dirtboy25 · Jul 3, 2011

Harland Sharp,.... Interesting to know they came out with them before anyone else. (other than custom sets)

Gearhead · Jul 4, 2011

Why would you need to keep adjusting the valves on a hydraulic system?

Chvyrkr · Jul 4, 2011

Gearhead said:
Why would you need to keep adjusting the valves on a hydraulic system?

:doh:

Sometimes I wonder if I'm awake when I post.

Obviously hydraulic lifters would take most of what I just said right out of the equation.

I'd have to ask why you need roller rockers, but can still get by on hydraulic lifters though... Be like doin half a cummins conversion.

Maybe that's why it didn't cross my mind.

CSIPSD · Jul 5, 2011

Why are we talking about roller rockers when the OP said he wanted to run 30-40# boost with a set of twins...

I think maybe we need to address that first...LOL

genie144 · Jul 5, 2011

Chvyrkr said:
Lots of variables, but there are a ton of people running Comp 910 springs at those boost levels with no apparent issues.

I have had my 910s to ~40-50psi... Everything I had read is that they are good to go as long as they are properly shimmed. You can call Swamps (or probably most site sponsors) about what shims you need.

Sam

UNLIMITED_DIESEL · Jul 7, 2011

The rockers are a nice piece. We have an old set, and they definety help if you are looking to help make power at higher RPM. However, I would not recommend them for daily driving. That is not what they were designed for.

FWIW, I don't think you can buy them from Harland Sharp. They do the work , but Wipe Out Enterprises is the reseller as far as I know.

Also, the redesigned rockers kick ass over the old design that we have.

Hotrodtractor · Jul 7, 2011

UNLIMITED_DIESEL said:
The rockers are a nice piece. We have an old set, and they definety help if you are looking to help make power at higher RPM. However, I would not recommend them for daily driving. That is not what they were designed for.

FWIW, I don't think you can buy them from Harland Sharp. They do the work , but Wipe Out Enterprises is the reseller as far as I know.

Also, the redesigned rockers kick ass over the old design that we have.

:stupid:

Also I do not know of anyone that has went to roller rockers on these engines and actually kept the hydraulic lifters - If you're keeping the lifters then the only benefit to a rocker swap would be a change in ratio - and there are FAR cheaper ways of doing that than going with full machined billet pieces with roller tips....

RoadWarrior · Jul 7, 2011

UNLIMITED_DIESEL said:
The rockers are a nice piece. We have an old set, and they definety help if you are looking to help make power at higher RPM. However, I would not recommend them for daily driving. That is not what they were designed for.

FWIW, I don't think you can buy them from Harland Sharp. They do the work , but Wipe Out Enterprises is the reseller as far as I know.

Also, the redesigned rockers kick ass over the old design that we have.

why would you not recommend them? i dont really see the deference in street running and 4500rpm. just wondering