Quote:
Originally Posted by ProfessorRock
So i think its time to have a serious conversation about the problem that we are having right now with lifters and cam cores .Again --- this time its billet or steel cams and what kind of lifter material you are going to put on the billet cam. This is a problem only with flat tappets, so those using rollersmay not even be aware. So how many 'just stockers" using flats are there?? If u r one of those racers or eng. builders that have tried ordering a set of steel lifters to put on your steel cam, you know there are none ,zero avail. anywhere,and back ordered 6months or more. It seems to me that the eng. builders don't want to talk about it in public. (why? maybe they all think that their customers (racers) believe that their builder is the only one who knows how to get a bigger cam lobe and use more spring pressure than all the other guys. LMAO as its some big secret haha (it isn't). All the top builders know how to do it. So no one talks about it. But NOW its a problem for everyone. Want a new cam ,great heres one.$500 Example -Want some steel tappets to go on that fancy new cam- sorry Sic dont got any. Well we have just a couple sets coated with DLC cost$2200 or more.and if they bounce just one time they will destroy your engine. Not our fault. So i started this thread because i know a little bit about materials and coatings, not everything ,but a little. So why dont some of you builders who belong to Classracer get in this conversation and see if we can find a solution,because it is not going away anytime soon. I know this likely does not affect the cars with smaller engines or cam specs. that dont use a lot of spring pressure. But most do. So as much as us older guys don't like all the rule changes, allowing not original parts ,it might be time to have this discussion with NHRA to save the pre 1987 cars. Because all of the roller motors (engines) do not have this problem. as Mr. William said "tis not that i love Caesar less, but that i love Rome (classracing) more. I am posting this on top forum also.
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Yes, there is a supply chain issue with parts.
The current catalog solid lifters have metallurgy and manufacturing issues.
PPPC, Trend and Crower manufacture the best solid lifters for use with billet camshaft cores. DLC is a nanocomposite coating and there are different types of DLC coatings that contain a different matrix. Never seen a lifter fail due to the DLC coating failing to what you call "bouncing". The only lifters I have seen fail had a ceramic puck added to the contact area.
If you valve "bouncing" on your lifters, then you have other problems that need to be addressed such as an unstable valvetrain and/or valvetrain issues..
Stock Eliminator is not the only class being affected due to the quality of solid lifters. There are many circle track associations, with sealed and non-sealed engines experiencing the same issues and many are considering the allowance of roller lifters.