Johnson Hydraulic Roller lifters
- Thread starter OConnor
- Start date
ek02
Well-Known Member
- Joined
- Jan 31, 2008
It appears that neither type is available yet. I'm waiting for the short travel rollers to become available. I am running Comp 885 short travel lifters right now. The short travel lifters seem to be a lot noisier than any other type. I run mine at zero lash as recommended by Comp.
Turbo Archie
Active Member
- Joined
- Feb 2, 2018
You don't run lash and its hard to believe they recommend 0.....
reggie0704
Member
- Joined
- Dec 17, 2022
From where
TIMINATOR
Well-Known Member
- Joined
- Jan 26, 2020
They are doing a short run now. I ordered a few sets, we'll see...
You shouldn't run hydraulics without lash, it will beat the retaining clip out and that's all that holds the plunger in, except the pushrod, until u float the valves and everything falls out! All Hydraulic lifters, on a fast ramp rate performance cam make more HP nearly bottomed out, that way you don't lose much lift or duration when they bleed off. And they all do, especially turbo and blower engines.
TIMINATOR
You shouldn't run hydraulics without lash, it will beat the retaining clip out and that's all that holds the plunger in, except the pushrod, until u float the valves and everything falls out! All Hydraulic lifters, on a fast ramp rate performance cam make more HP nearly bottomed out, that way you don't lose much lift or duration when they bleed off. And they all do, especially turbo and blower engines.
TIMINATOR
Turbo Archie
Active Member
- Joined
- Feb 2, 2018
TIMINATOR
Well-Known Member
- Joined
- Jan 26, 2020
PRELOAD!!!!!!!
I MEANT PRELOAD!
Most run a half turn down from zero. That advice is from the OLD DAYS when lobe design outpaced spring design, and valve float was a normal occurrence with most performance cams. When float occurs, the lifter will fill up the oil chamber and hold the valve off its seat, possibly allowing valve to piston contact, and destruction. This is also why cam companies say you need .100" to
125" valve to piston clearance.
With modern computer designed lobes, and better spring materials, float is mostly a thing of the distant past.
Preloading at a "half turn" or .025/.050" can allow as much as .100" of plunger travel to bleed off under higher rpm, boost, hot oil, or the amount of spring pressure required on a turbo engine to keep the valves closed against boost in the intake tract, or back pressure in the exhaust.
All Hydraulic lifters bleed off to some extent when running, or off, if the engine is shut off with a valves, or several open.
That's why it's common to have a few clicky lifters on startup until oil pressure refills the chamber under the plunger.
The deeper the preload, the less the amount of lost lift and duration will be when the oil is bleeding past the plunger.
On a hi perf/high spring pressure application, many of us run the preload a half turn UP FROM THE BOTTOM!
This limits the loss of lift and duration to a maximum of that amount.
An adjustable valvetrain (which our v-6s don't have), setting preload is easy. In our engines, bleed off all the lifters one at a time, and replace the pushrods with longer ones to put the plunger lower in the lifters. Smith bros. will make you ANY LENGTH you require.
Serious racers limited to Hydraulic lifters by NHRA or engine design have 4 or 5 sets of pushrods in .025" increments to effect preload changes.
A solid roller cam and adjustable valvetrain is an easy, but not cheap solution. Several sets of different length pushrods is cheaper, if you care enough to get that last bit of HP.
Speed costs money, how fast do you want to go, or more simply put, how often are you prepared to lose.....
TIMINATOR
I MEANT PRELOAD!
Most run a half turn down from zero. That advice is from the OLD DAYS when lobe design outpaced spring design, and valve float was a normal occurrence with most performance cams. When float occurs, the lifter will fill up the oil chamber and hold the valve off its seat, possibly allowing valve to piston contact, and destruction. This is also why cam companies say you need .100" to
125" valve to piston clearance.
With modern computer designed lobes, and better spring materials, float is mostly a thing of the distant past.
Preloading at a "half turn" or .025/.050" can allow as much as .100" of plunger travel to bleed off under higher rpm, boost, hot oil, or the amount of spring pressure required on a turbo engine to keep the valves closed against boost in the intake tract, or back pressure in the exhaust.
All Hydraulic lifters bleed off to some extent when running, or off, if the engine is shut off with a valves, or several open.
That's why it's common to have a few clicky lifters on startup until oil pressure refills the chamber under the plunger.
The deeper the preload, the less the amount of lost lift and duration will be when the oil is bleeding past the plunger.
On a hi perf/high spring pressure application, many of us run the preload a half turn UP FROM THE BOTTOM!
This limits the loss of lift and duration to a maximum of that amount.
An adjustable valvetrain (which our v-6s don't have), setting preload is easy. In our engines, bleed off all the lifters one at a time, and replace the pushrods with longer ones to put the plunger lower in the lifters. Smith bros. will make you ANY LENGTH you require.
Serious racers limited to Hydraulic lifters by NHRA or engine design have 4 or 5 sets of pushrods in .025" increments to effect preload changes.
A solid roller cam and adjustable valvetrain is an easy, but not cheap solution. Several sets of different length pushrods is cheaper, if you care enough to get that last bit of HP.
Speed costs money, how fast do you want to go, or more simply put, how often are you prepared to lose.....
TIMINATOR
TIMINATOR
Well-Known Member
- Joined
- Jan 26, 2020
Before any of you say:"I have adjustable roller rockers, and I can add more preload." DON'T!!!
Most instructions that come with them aren't very specific as to why that isn't possible.
Our Buicks (and most other shaft mount rockers systems) oil the rockers thru the pushrods. The oil hole in the side of the adjuster needs to line up with the oil hole in the rocker arm body to allow oil to flow to the pivot/trunnion and roller tip. If the adjuster is not within a one or two thread range, the oil flow will be cut off or restricted, resulting in rapid wear of the trunnion or tip roller bearing. Most of the instructions that I have seen don't make that very clear. Just sayin'..
TIMINATOR
Most instructions that come with them aren't very specific as to why that isn't possible.
Our Buicks (and most other shaft mount rockers systems) oil the rockers thru the pushrods. The oil hole in the side of the adjuster needs to line up with the oil hole in the rocker arm body to allow oil to flow to the pivot/trunnion and roller tip. If the adjuster is not within a one or two thread range, the oil flow will be cut off or restricted, resulting in rapid wear of the trunnion or tip roller bearing. Most of the instructions that I have seen don't make that very clear. Just sayin'..
TIMINATOR
Johnson Lifters ST2112SBR-V6 Buick V6 Short Travel Hydraulic Lifters
Johnson Lifters ST2112SBR-V6 Buick V6 Short Travel Hydraulic Lifters • Cold forged steel body heat treated for exceptional wear resistance. • Precision ground needle roller bearing with high chromium steel axle for long life and minimal friction. • Cold forged extra long piston, precision ground...
fullthrottlespeed.com
The Short Travels are available also!!
ek02
Well-Known Member
- Joined
- Jan 31, 2008
Thanks. I didn’t see them. I’ll change my order tomorrow.Johnson Lifters ST2112SBR-V6 Buick V6 Short Travel Hydraulic Lifters
Johnson Lifters ST2112SBR-V6 Buick V6 Short Travel Hydraulic Lifters • Cold forged steel body heat treated for exceptional wear resistance. • Precision ground needle roller bearing with high chromium steel axle for long life and minimal friction. • Cold forged extra long piston, precision ground...
The Short Travels are available also!!
BEATAV8
The Engine Whisperer
- Joined
- Feb 14, 2002
Jonson Lifters Install info
JOHNSON LIFTERS INFO IS PER JOE LEWIS AT JOHNSON Clean- Blow off with compressed air to remove cardboard pieces from packing. Oil soak- No need to soak in oil prior to use as they come from factory pumped up. After cleaning, place a couple of drops of (30 wt. or close) oil on bearings of...
ek02
Well-Known Member
- Joined
- Jan 31, 2008
Thanks for the adjustment specs.Jonson Lifters Install info
JOHNSON LIFTERS INFO IS PER JOE LEWIS AT JOHNSON Clean- Blow off with compressed air to remove cardboard pieces from packing. Oil soak- No need to soak in oil prior to use as they come from factory pumped up. After cleaning, place a couple of drops of (30 wt. or close) oil on bearings of...www.turbobuick.com
