Which lifters for SILENT valve-train???
You've got me thinking about the LS7 lifters on my car; so what lifters are you going with?
They are of the same quality/price as Morel,Crower,Lunati......made 100% in the USA
...and cost in the neighborhood of $600.00.It's going to be a bit of a wait, but the production run is under way currently.
I'm confident that they will be the last set of lifters that this engine will ever need. I'll post a review, once I get the okay from the company.
Last edited by salemetro; Feb 1, 2012 at 01:34 PM.
If I'm not mistaken, Johnson is the larget lifter manufacturer in the world. Their parts are probably in a lot of boxes marked with other brand names.
If I remember correctly they had a fire at one of their facilities some time back as well. Quite a few years ago.
I would be curious as the what the GM "specs" are for the lifter internals. We are talking tens of thousandth of an inch. Also would like to know what the "sepc" for bleed down rate is. And how it is measured.
So that said, if parts are on the high end of the blled down spec are subjected to high spring pressure, I can see why they would make noise.
On the lift issue. I would think that would decrease to little or no issue at high rpm due to less time to bleed down. Just like the Rhoads were designed to do.
If I remember correctly they had a fire at one of their facilities some time back as well. Quite a few years ago.
I would be curious as the what the GM "specs" are for the lifter internals. We are talking tens of thousandth of an inch. Also would like to know what the "sepc" for bleed down rate is. And how it is measured.
So that said, if parts are on the high end of the blled down spec are subjected to high spring pressure, I can see why they would make noise.
On the lift issue. I would think that would decrease to little or no issue at high rpm due to less time to bleed down. Just like the Rhoads were designed to do.
I'd think so too....but it does not start to clear up until 3.5k. I spend most of my time on the highway cruising at 2k or less....it's driving me crazy. What really bothers me the most, is the potential lift that is being lost. If I'm hearing "chatter" up past 3.5k, then how much is lift suffering? I'm betting that it's suffering considerably throughout the RPM range. Some might say that I'm being too picky, but I just want everything to work as it should.
Link bar lifters will make a little noise (nothing like what I'm experiencing), but will take whatever you can throw at them for cam profiles. They are also more expensive.
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Verdad Gallardo It's because I'm using stiffer springs than a stock LS7. The added spring tension is overpowering the lifter's resistance to bottoming out.
I use LS7s in all my builds and don't have any problems even with patriot duals and with 0w-20. The only thing different I do is port the exit on the oil pump and shim the spring or use an l92 or l99 pump.
From the looks of things, I'm not alone in this problem either. After having a conversation with someone who has tested literally hundreds of LS7 lifters..and reading his leakdown results vs/ industry-standard specification, it's becoming clear as to the reason why.
But let me just say....it's not my intent here to be bad-mouthing the OEM pieces. I'm just trying to find a solution to my car's current problem, and hopefully help others in the process. I realize that while I believe that I've narrowed down my car's problem to the lifters being the source of the issue, not everyone else will have the same solution.
