Anyone running Brian Tooley SLR lifters?
03-12-2013, 01:25 PM
#63
Who makes one for the LS engines?
But the pump creates flow, not pressure. The restrictions create the pressure So I still would love to see an engine that you can put a load on and the oil PSI doesn't go up at all.
electric pump or design a lifter with a progressive leak rate to maintain lifter cup position through the range of engine speeds. pump would be much easier to do I'd think, and it would also allow you to pre/post flow oil through the engine prior to start up and after shut-down.
just theoretical though, I think the costs associated with doing this would be even more offensive than the prices of some of the link bar lifters.
just theoretical though, I think the costs associated with doing this would be even more offensive than the prices of some of the link bar lifters.
Last edited by King Nothing; 03-12-2013 at 01:31 PM.
03-12-2013, 01:35 PM
#64
flow and pressure head are coupled. the engine internals are fixed, so if you force more flow through a defined restriction you are going to increase the pressure. with a variable controller, you can send the tach signal to the pump and adjust its speed according to how much or little is consumed.
proof of concept: take a garden hose, stick your thumb over the end of it and open the valve only slightly. then fully open the valve to increase the flow rate. I guarantee the force (pressure) you feel on your thumb is significantly more in the second case.
Last edited by ckpitt55; 03-12-2013 at 01:41 PM.
03-12-2013, 01:38 PM
#65
lol it wouldn't be a bolt-on.
flow and pressure head are coupled. the engine internals are fixed, so if you force more flow through a defined restriction you are going to increase the pressure. with a variable controller, you can send the tach signal to the pump and adjust its speed according to how much or little is consumed to maintain a constant pressure.
flow and pressure head are coupled. the engine internals are fixed, so if you force more flow through a defined restriction you are going to increase the pressure. with a variable controller, you can send the tach signal to the pump and adjust its speed according to how much or little is consumed to maintain a constant pressure.
03-12-2013, 01:52 PM
#66
it wouldn't take millions in R/D, it might take millions in components though lol. the tech already exists on heavy industrial equipment. not all that practical for your every day driver.
Last edited by ckpitt55; 03-12-2013 at 02:03 PM.
03-12-2013, 02:24 PM
#68
taking this to pm's now that I've thoroughly derailed the thread 
bringing it back on topic, I guess the takeaway from this thread is that overall valvetrain component matching is more important than finding *the* magic lifter. valves, springs, pushrods, rockers, everything.
I'm curious how the bleed down rate of the SLR compares against the LS7 at high rpm....from how I'm understanding this, a slow leakage rate would help at low to mid speeds and reduce lift losses when oil pressure isn't that high, but wouldn't they pump up more easily at high rpm since less oil is being allowed to escape / unit time, exacerbating the whole valve bounce/float issue? Slow leakage rate compared to what, I wonder..
bringing it back on topic, I guess the takeaway from this thread is that overall valvetrain component matching is more important than finding *the* magic lifter. valves, springs, pushrods, rockers, everything.
I'm curious how the bleed down rate of the SLR compares against the LS7 at high rpm....from how I'm understanding this, a slow leakage rate would help at low to mid speeds and reduce lift losses when oil pressure isn't that high, but wouldn't they pump up more easily at high rpm since less oil is being allowed to escape / unit time, exacerbating the whole valve bounce/float issue? Slow leakage rate compared to what, I wonder..
Last edited by ckpitt55; 03-12-2013 at 02:50 PM.
03-12-2013, 05:23 PM
#70
I'm curious how the bleed down rate of the SLR compares against the LS7 at high rpm....from how I'm understanding this, a slow leakage rate would help at low to mid speeds and reduce lift losses when oil pressure isn't that high, but wouldn't they pump up more easily at high rpm since less oil is being allowed to escape / unit time, exacerbating the whole valve bounce/float issue? Slow leakage rate compared to what, I wonder..
There's a SAE standard for leakdown rate.
03-12-2013, 09:01 PM
#71
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Brians point is there is nothing wrong with the LS7's as long as you can keep your valve train under control. I am running the LS7's that I already have in my new 402 setup. My cam does not have super aggressive lobes, and I will be running his best spring kit. I do not know all your specs but after going over mine with Brian, he said the LS7's will be fine for me.
03-12-2013, 10:45 PM
#72
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i just installed SLR lifters in my 408 now im waiting on pushrods and the time to finish installing everything else. My preload will be right around .050 or a hair lower. I have tsp .675 springs but i do have the heavier valves that come with prc 247s but i am also running HUC lobes
04-09-2014, 01:51 AM
#77
/rests head in hand......
Measure. Brian stated they are the same as a stock lifter. The setup of ALL of the other valve train components will determine length. Not the lifters.
Valve length
Rockers used
Cam used (different base circle than stock?)
Head design/milling
Measure. Brian stated they are the same as a stock lifter. The setup of ALL of the other valve train components will determine length. Not the lifters.
Valve length
Rockers used
Cam used (different base circle than stock?)
Head design/milling
04-09-2014, 06:50 AM
#78
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Cam is from Brian tooley. 229/244 615/596 on a 113+4. Rockers are stock ls3 rocker arms with trunion kit. Heads are Ls3 with btr 660 springs. No milling on them at all. Motor is a ls3 top . 6.0 block with ls3 internals.
04-09-2014, 07:24 AM
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