This is one of those topics or mods or whatever you choose to call it that the Hemi crowd will be left in the dust on because we as a community are far too skeptical of everything. Granted I've seen our community go through some tough times and get taken advantage of more than once. After a few people who are considered "Hemi gods" post up that they use them and they do work then others will "follow" suit. Be a leader not a follower lol I'm a bit jaded I'll admit because the Hemi guys tend to be very very hard headed
However I am VERY proud to be part of the exclusive Hemi crowd regardless of our shortcomings.
Ok so "IF" I can get everyone to drop their guard enough to actually listen or read LOL there is something to be gained for all of us.
As Red Truck pointed out and most know the Hemi oils down the push rod and the lifter relies solely on this oil to stay pumped up and keep zero lash at all times.
In stock form this works OK but I wouldn't say its great for the reasons he pointed out. From a high performance standpoint its not so great at all. Higher spring pressures, more aggressive cam lobes, higher rpm, and the exhaust valve opening against much higher cylinder pressures to name a few.
A lifter is a bit more complex than most think and there is quite a bit of engineering that goes into them. OE Hemi lifters are designed to do an average job and be cost effective due to the shear numbers produced and as most of you know they are failing left and right so something is wrong, bad wrong. If you don't already know the Hellcat lifters are not special except the name is attached. It's the same part number and has been for quite a while and is used as a sales tool. I cringe every time I see someone bragging they have Hellcat lifters because they are the same as any other non MDS lifter and have the same inherent flaw.
There is a solution and a permanent fix to that problem as well as a significant power increase to be had. Johnson lifters makes a lifter for the Hemi that rectifies the oil down issue as well as actually keeping zero lash at all times. First I want to make clear that the Johnson I'm speaking of is NOT the Topline Hylift knock off version. This is the "real" Johnson lifter company and the quality is second to none.
The Johnson lifters use the oil pressure and supply that's in the lifter galley rather than having to wait on the oil coming down the push rod. This way they stay pumped up and actually pump oil up the push rod. They also have one that forces oil to the roller axle as well for higher horsepower applications.
They use a proprietary machining process to maintain extremely efficient control of the bleed down rate. I'll disassemble one and show pics versus the OE. There is a lot more to it but it's just too much for one post. Please note that I'm not slamming the OE lifters as I'm truly amazed at what they can accomplish giving the fact they are being used way beyond their intended purpose.
I'll have to ask for forgiveness for even saying this but if your not sure who Johnson is simply ask an LS guy (they are everywhere it seems) lol. In the LS world the Johnson lifter is the go to lifter and we know how cheap those guys can be
These lifters are not cheap but they are far superior to anything out there and can handle 8000+ rpm as well as 185+ spring pressure on the seat and 500 on the nose. Only the guys with T Tek head will prob ever see that spring pressure but they will handle it. You don't have to spin to 8000 to see a gain I'm simply stating the capabilities.
I don't want to make this post too long so I'll answer questions and explain more in another post if anyone is interested. I also have a dyno sheet showing a true apples to apples comparison with just a lifter change. Same car, same engine, same boost, same dyno, same fuel, and for full disclosure the run with Johnson lifters had 3-4 degrees less timing because the dyno fan wasn't working that day so the IAT's were over 200*
I wasn't going to hurt an engine just to make a bigger number as the results were already very obvious. The car went from a 10.4 to a 9.7 backed up by a 9.68 @147 with Johnson lifters. With the car on the track and air across the intercooler we were able to put some timing back in.
Lets get passed the "its just a dumb ole lifter" and "what I have now works just fine" because we as a community will never excel with that type of backwards thinking.
I'm not a big social media guy so not sure if I can just post pics here or if I'll need to use a hosting site. Either way I will try to post what I have asap. Sorry for the long post