Link Bar Lifters: Comp vs Morel / Lunati
05-05-2013, 10:19 PM
#1
Link Bar Lifters: Comp vs Morel / Lunati Had a set of the Lunati 72437 fail on me - many of them stayed pump up, one simply was pumping up at all. Dyno time only, zero miles. Not sure the root cause yet, but will soon.
Haven't heard enough data on the new short travel lifters (Comp 15956) to definitively say it's a better plan, but have a set coming anyway.
I struggle in believing i could get another bad set of the Lunati / Morel lifter, but the thought of tearing my intake off again to even fix one...doesnt sit too well with me.
Thoughts, experience, etc appreciated...
Haven't heard enough data on the new short travel lifters (Comp 15956) to definitively say it's a better plan, but have a set coming anyway.
I struggle in believing i could get another bad set of the Lunati / Morel lifter, but the thought of tearing my intake off again to even fix one...doesnt sit too well with me.
Thoughts, experience, etc appreciated...
05-06-2013, 07:57 AM
#3
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Just called Vengeance racing for my lifters because cam lift is over .680 lift. I'll probably be getting Morel 5206's lifters and PAC1207X springs because I bought TFS ls3 heads bare.
05-06-2013, 08:56 AM
#4
A properly set-up short travel system is usually worth another 500-1000 more RPM before valve float, in a given application. Throttle response almost always increased in the engines I've been involved with, after switching to short travels. They work well because of the amount of time needed to replenish the high pressure chamber (area below the plunger) inside the lifter with oil. The key is to get the proper preload on every lifter. This will require measuring all 16 and ordering a few different length pushrods. I don't agree with Comp's .002"-.004" preload recommendation. I'd set them in the .030" area to account for expansion and quiet them down.
05-06-2013, 12:39 PM
#7
There's only a few ways this can happen if the piston is still freely moving, and just not pumping up. The I.D. of the lifter body or O.D. of the piston could be slightly O.O.R., and once it ran for a few the leakdown went out the window. Low leakdown to begin with. Or the check ball in the piston isn't sealing, caused from various issues but most commonly debris. A couple microns is all it takes in some cases.
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05-06-2013, 12:53 PM
#8
There's only a few ways this can happen if the piston is still freely moving, and just not pumping up. The I.D. of the lifter body or O.D. of the piston could be slightly O.O.R., and once it ran for a few the leakdown went out the window. Low leakdown to begin with. Or the check ball in the piston isn't sealing, caused from various issues but most commonly debris. A couple microns is all it takes in some cases.
I do like the idea of additional valve train stability and throttle response (though isnt going to be a problem - ITB), but I'm concerned about your thoughts on pre-load. Isnt the full travel of these lifters about half that?
05-06-2013, 01:07 PM
#9
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Morel (and the Morels badged as Lunatis) are pretty much the creme de la creme of hydraulic lifters.
No personal experience with the Comps, but I'd have a hard time believing the Comps are a step up.
No personal experience with the Comps, but I'd have a hard time believing the Comps are a step up.
05-06-2013, 01:22 PM
#11
Thanks....that seems to be the concencus and hope to find out for sure this afternoon. This has apparently happened on a number of other occasions, which has me concerned in pursuing the Morel / Lunati again.
I do like the idea of additional valve train stability and throttle response (though isnt going to be a problem - ITB), but I'm concerned about your thoughts on pre-load. Isnt the full travel of these lifters about half that?
I do like the idea of additional valve train stability and throttle response (though isnt going to be a problem - ITB), but I'm concerned about your thoughts on pre-load. Isnt the full travel of these lifters about half that?
05-07-2013, 03:08 PM
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Had a set of the Lunati 72437 fail on me - many of them stayed pump up, one simply was pumping up at all. Dyno time only, zero miles. Not sure the root cause yet, but will soon.
Haven't heard enough data on the new short travel lifters (Comp 15956) to definitively say it's a better plan, but have a set coming anyway.
I struggle in believing i could get another bad set of the Lunati / Morel lifter, but the thought of tearing my intake off again to even fix one...doesnt sit too well with me.
Thoughts, experience, etc appreciated...
Haven't heard enough data on the new short travel lifters (Comp 15956) to definitively say it's a better plan, but have a set coming anyway.
I struggle in believing i could get another bad set of the Lunati / Morel lifter, but the thought of tearing my intake off again to even fix one...doesnt sit too well with me.
Thoughts, experience, etc appreciated...
Do you have any pics of said lifter? I just had a set of the Lunati's (same exact part number) fail me two weeks ago and lost the cam in the process.
