That is what he said

Might as well just go solid lifters….. but that’s a 3000 mile annual repeat valve to rocker arm adjustment, not to mention adjustable roller rockers, oh no more $$$$$. What do you mean I need taller rocker covers too and maybe longer ignition wires. The good and bad of hydraulic lifters. Putting in 7.50 pushrods really increased hp and torque very noticeably. Makes me realize I have more room for a bigger cam without sacrificing drivability in a automatic. I have a BTR Stage 2 N/A LS3 cam in my 416 stroker. Idle is very tame at 850 rpm without much chop if any at idle, actually very smooth. BTR hasn’t come out with the LS3 V2 of the stage 2 or stage 3 LS3 cam. I think Brian discovered more power potential using the spinnes sprone.. I think that’s how it’s spelled lol.

Didn’t those guys also take lifters apart and shim them so they couldn’t collapse?

@@MyLonewolf25 ....maybe.....🤐

@@MyLonewolf25 Sure did - left just enough travel so the weren't completely solid.

@@MyLonewolf25 I do this in BMW inline 6's. I get hardened shims made the right diameter to go inside the stock hydraulic bucket lifters. I remove the check ball and spring from the inside to disable them and set the lash with the shims. Running mine at 9000 rpms.

Always wondered why pushing the lifter plunger down in bore made power and totally forgot about oil being aerated with air. It’s the air in the lifter bore oil compressing effectively shortening the duration and lift a bit.

Years ago experts insisted that running hyd lifters as long as possible (1/4 turn preload) was the best. Now we need to run them 1/4 off the bottom. My how ideas change.👍

contact patch does not change-rocker position is fixed

Richard Holdener on a small block with adjustable rockerarms

Those wanting to know LS rocker bolt 8mm x 1.25 = 20.32 threads per inch 1”/ 20.32 = .0492 trunion movement per turn of the rocker retainer .0492 applied to appropriate formula=.078 lifter preload per turn for a (1.7) rocker .0492 applied to appropriate formula =.076 lifter preload per turn for a (1.8) rocker

Pretty smart

hydraulics often make more if the cam is the same (hyd doesn't have lash)

@@richardholdener1727 how does this happen when there's more cushion in the lifters? Plus, aren't the solid lifters more controllable because of their weight advantage?

@@prestonedmonds4128 hydraulic lifters take up some of the valve lift, a tight lifter might lose .005 valve lift under the best circumstances, bad ones with hard valves springs will lose more. It gets worse as the oil gets aerated at high rpm. Something like this, with double spring and 6k rpm, it's probably losing .020 lift or more at the valve. You could put solid lifters in and adjustable pushrods and duplicate the power curve to get an accurate guess. A solid cam is always going to have lash and rarely is it going to be less than the hydraulic deflection. Solid cams can have faster ramps because the lifters are.lighters and there isn't a hydraulic element that can limit valve spring pressure. When you have a ton of spring pressure it can play havoc with hydraulic lifters. Kinda why street solid rollers have fallen out of favor. When you can get 7000rpm blasts out of something with factory lifters and really low maintenance, solid rollers get left on the shelf for proper race cars and really hardcore guys.

A good hydraulic roller with the CORRECT valve geometry is near as good as a race type solid roller. Better for street applications always. But the solid cam will make more top end power!

A spintron machine is what you want to be able to fine tune your valve train Nascar engine builders and top fuel builders have started to use them over the last 5 years. A properly tuned or optimized valve train as a package will make the most of whatever engine its installed on. A dyno can only measure engine output a spintron works the opposite it spins the motor over allowing for measurement of valve bounce or pushrod deflection.

I'm sure I did

Yeah, I second that, would luv to see how they compare to a standard hydraulic lifter, especially with big cam 👍

adjustable rockers would change the contact patch and geometry with different pushrod lengths

Thnx-its not weight

Valve float could have been a result of the adjustable rods being heavier.

Definitely worth testing!

10HP. It’s been done.

The stock rockers are already like roller rockers. The tip of the rocker has a curve. It naturally rolls on the valve stem instead of sliding. Pretty trick pieces.

rocker vid is up

Thickness changes harmonic, so if you have a harmonic issue you can thicken it and push it up in the revs above your use range.

That is incorrect. Physics tells us if you double wall thickness, the yield strength is now 4x what the original thickness was. It is an exponential increase, not a linear increase.....

I was gonna leave a smartass remark then I recognized your username. I've followed your ltd build for like 8 years, me and a buddy tried doing the same blower set up on his ranger but he is a lazy fuck and never finished the "adapter".

there is no lash in a hydraulic roller motor (only lifter preload) adj valve trains on solid cams are different

Running minimal preload made a significant difference in idle quality and made tuning easier on early efi systems but now i wonder if it cost power. I wish Richard would talk more about idle, low rpm and surge characteristics in his videos.

My 350 Vortec made alot more torque with 1/4 turn preload. Same HP up top.

That was my thought too. With a shorter pushrod at low RPM, you're getting an effect of increased cyl compression ratio due to more a depressable lifter (lower oil pressure, more air). At high RPM's, especially with the longer pushrod, you're getting the effect of more lift, and sooner due to less compressible air volume inside of the lifter.

The cam guy mentioned aerated oil in the lifter. If the oil was 100% loquid, it wouldn't compress & act like a solid lifter. Due to leakage & air, it compresses some before it balances out and movs the valve. The spring pressure just determines how much that lifter compresses. Reduce the aerated oil volume by pre-compressing (preload) and it moves the valve sooner. The net effect is like adding a tiny bit of lift all over, which increases duration. That's why it kills a little down low and increases power up high.

what was the reason for the misfire? holding the valves open slightly?

There is no change in rocker geometry on the ls with a change in pushrod length-it is a bolt-down rocker

@@richardholdener1727 I wasn't talking about this video, I was talking about a new one about checking geometry and correcting it if needed. This is a little known procedure. For the last 10 years of my career I taught High Performance engine machining and building and dyno testing and tuning at a tech college and many of our students got great jobs. We had the best machines for them including Sunnen Seat and Guide machines and other state of the art gear. Rocker Arm geometry was nor part of the course but sometimes I would show that to students who wanted to excel. With that said I love your videos and I am jealous - I wish I could do what you do, it would be so much fun.

These are really minor changes, like tiny. I would be surprised if someone ran back to back runs in the same car and would even notice. Even at the drag strip you would be looking for like .05, but probably more like .02 on a run.

No, solid lash is a fixed amount except for heat expansion. Hydraulic lifter the oil keeps the lash consistent except for aireation and pump up.

Strange reasons were to prevent or limit "pump up" when the spring could no longer control the valve, thus giving more rpm.

We always went an EXTRA 1/2 turn PAST spec to increase preload on the small block chevys. Not a 1/2 turn past zero lash. Effectivley accomplishing the exact same thing Richard is with the LS by using longer pushrods. Its just adding preload to the lifter.

there's always 1

have only gone the other way

pushrod length has not effect on rocker tip position-rocker is not adjustable

@@richardholdener1727 Yes it absolutely does. when you start your rocker arc at a low position, the efficiency of lift is nowhere near as direct as it is at exactly level.the sweeping action is theoretically changing the ramp rate, and ultimately the valve stem speed throughout the lift range. this was proven 50 years ago with a GM engineer (Ralph Johnson) on a solid cam small block, where there was no oil in any part of the equation. kzfaq.info/get/bejne/iNCRotaJm5mom4E.html

Always is

yes-its a huge benefit