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Cliff your thoughts on roller rockers?
Mudsport96:
I saw you commented on things not to waste money on in another thread. So, not wanting to clutter someone else's thread I figured I would ask here.
I know and have seen that the heavy roller tip rockers can cause valve train stability issues. But what are your thoughts on just roller fulcrum rockers?
I have 1.6 Harland Sharp full rollers on my engine. I did not buy them, they were on it when I got it. The heads were bare when the engine was machined so it got screw in studs, guide plates, and some mikd bowl work. With the slow ramps and mild lift of the old school High Energy cam the 1.6 helps get more lift without the radical Extreme Energy grind.
I don't have float problems because it has the highest spring pressures that Comp recommend for that cam and it is also admittedly a mild cam that makes max power at probably 5000 So other than the expense and weight issue, what are the drawbacks? I have checked stock rockers and seen Ratio variations from 1.3 to 1.55 on stock stamped rockers. So if nothing more than consistency I personally like aftermarket rockers.
Cliff Ruggles:
Most of the information on stamped steel rockers arms being all over the map for ratios is regurgitated from information that wasn't all that accurate right to start with.
Stamped steel rockers are light, strong, and good for most of these engine builds.
I do NOT like or use the "roller tip" varieties. Comp Cams roller tip rockers, for example are heavy, and poor fit to the grooved rocker balls they supply with them. They "grind" in and turn blue and even black from the heat.
The grooved rocker balls are also a design flaw as they allow the oil from the pushrods to run straight down the studs and back to the sump vs "pooling" on top of the rockers and getting atomized for lubrication and cooling of the springs and other related parts.
Almost all roller rockers being offered are pieces of bovine excrement (imported). The only ones I would even look at using are Crane Gold Race (not even sure they are still available), Harland Sharp, or Crower Enduro.
The rest will have low quality imported needle bearings, weak rocker bodies (cracking or letting the pins slide out at the roller tips), or grind up the inside of the rollers a the pins. Even some taunted to be high quality parts have failed miserably where we tried to use them here.
Scorpion, for example are supposed to be USA made, but I doubt it. We tried a set and cracked nearly all of them at the roller tip end.....junk!
Tried PRW stainless full rollers and ground up all the rollers at the pins and put TONS of ground up metal into the engines........FWIW.......
Mudsport96:
I have heard similar stories about the failed fulcrum needles. The set of Harlands on the car are from the early 2000s and have at least 10k miles on them. So I'm hoping they hold up for a while yet. The original owner that put it together was dead set on rollers and hell it was his money so I had no say. But, it runs great, if someone made a 1.6 rocker in the standard stamped steel style I would probably run it just to be safe.
quadrajam:
I have stamped steel 1.6 rockers in my 350. Got them from SUMMIT.
Good point about the oil pooling Cliff, I would have never thunk it.
Mudsport96:
Quadram, are they roller tip or factory style slipper tip 1.6s?
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