Harold,

Whats your thoughts/opinion on Schubecks axle-less solid roller lifters in the .904 diameter???

pdq67

Do you want Harold Sutton or UD Harold? I'm kind of wondering myself if the roller will withstand much abuse or not. There doesn't seem to be much information on how much spring to run and so on. I haven't done much research on these items yet. They appear to be very light so maybe not nearly as much spring pressure will be required. I also suspect you really want UD Harold so maybe he will pick up now and shed more light on this subject.

We will have to start calling you Harold S. as both of you get tapped for info quite a bit!:)

UD Harold has a wealth of cam design information in his head. I suspect that is who pdq 67 is looking for as about the only thing i know is what we have learned from my son's fast Chevelle. I'm always glad to share my small bits of knowledge though.

this question is what you need to ask yourself...
whats gonna happen the first time (for any reason) that oil pressure drops at high rpm?
the rooler runs on a film of oil like a rod bearing....no(low) oil pressure and.... I see ballbearing sized parts fling around your engine...
there great for that last hp ...but are you running heads up drags?
I'll stick with setting up my engine for fast intake removal to check the roller lifters on the "old school" lifters....
how you gonna check the oil film lifters, when you (check) them there will be no oil pressure on the roller to "see" if all is well..

pdq67,

As has been stated, no oil pressure=seized bearings, including the rollers.
I have not heard of any of Schubeck's lifters failing, but OTOH I do not back up his claims for his various types of lifters either. If they fail, see Schubeck for your warrantee problems.
One thing of importance though, if those rollers are .904" in diameter, or actually any size larger than .750", the cam MUST be cut-out for that diameter of roller, or it will check totally wrong. NOt totally, of course, the lobe lift should be correct....
I personally would like to see a roller lifter with a ceramic-matrix bearing(no needle rollers) and a big axle, still with oil-feed to the bearings.....

UDHarold

Years ago I held a sandblasting nozzle tip in my hand one time that was a steel gray ceramic material. The guy that handed it to me said, "what do you think of this" and "be careful and don't drop it!!".

I don't remember if it was boron carbide, silicon carbide or what, but I do remember it was light as a feather! (Sucker was like a chunk of Anthracite Coal!!)...

And looking for sandblast nozzles on the WWW just now, I found "Cerbide", a longer wearing tungsten carbide/cermet(??) material.

Maybe somebody will make the type lifter design you are talking about since the Materials Science guys seem to be working hard at coming up with harder and harder materials...

And what is Isky's "hardface overlay" stuff they use to make hard lobes??

pdq67

PS., and a side note: Harold, it look's like the new Voodoo cam line is taking off like a Rocket!!

There is a ceramic they use now for bullet proof vests. The only thing harder than this material are diamonds, and it is super light. I don't recall the name if the material though.