Johnson HT-2011 hyd lifters
Y...When M_body_coupes lifter cups came out did they keep the bent push rods tight or did the lifter bounce off the cam and wipe out a lobe?....
So this is where things really do get interesting, here is why.
There were no bent pushrods, no wiped lobes. Because of the design of the retaining clip it was "captured" around the pushrod, so neither it nor the lifter cup itself ever escaped into the motor. This was a great outcome, no damage done beyond the clip being popped out of it's place in the lifter body.
So what happened? Well, partly in reference to your response to my other post, I called the manufacturer to understand if they had any other customer reports of similar issues. Their answer was a "safe" response along the lines of "..we have made some engineering improvements to the lifter cup retaining ring to avoid failures...but racing parts of course do not carry any warranty...", hmm...interesting!
My takeaway from this was: mfg beefed up the clip, having replaced it with a snap-ring. For all I know, while I suspect some valve float occured, given the lack of any other damage either I was extremely lucky, or perhaps the root cause was something entirely different...running that lifter (as per the mfg instructions) at zero pre-load does expose that sheet-metal clip to the full oil pressure the lifter body sees...I run a high volume pump, at 6K that pegs the pressure gauge at about 70-80psi...was that just "enough" to pop that clip out???
I will never know...but the very same lifter with the inner retaining ring has been trouble free.
