Link Bar Lifters: Comp vs Morel / Lunati
07-25-2013, 11:27 AM
#31
I think I'm going to sell this car and by a nice stock C7 and leave it the F' alone...
07-25-2013, 11:31 AM
#32
The car is at the beach getting the top end refreshed and the CHE's installed. It was running well for them but developed a dead miss. Had to pull the cam to get the lifter out. Johnson's are going in. It didn't damage the bore enough to require sleeving.
I think I'm going to sell this car and by a nice stock C7 and leave it the F' alone...
I think I'm going to sell this car and by a nice stock C7 and leave it the F' alone...
07-25-2013, 09:46 PM
#39
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Guy's what is the major Difference with The Johnson lifter compared to Morels is it quality control...needleless bearings for the wheel,or it's made of a better material. I'm hoping that Ron was right in that Isky will make a EZ roller lifter.To lose a engine because of some bearing's is pretty distrubing.
07-25-2013, 09:55 PM
#40
The Morels have outstanding materials. If they are failing, it has to be a QC issue with internal tolerances or something else since most seem to run for a while without issue. Perhaps contaminates in the oil? Improper oil? Improper oiling from the LS1 engine to the valvetrain...
The Johnsons are a different design. Short-travel. But apparently very well designed. But like most of these aftermarket parts, they've been recalled and redesigned already.
The problem with any of these high dollar parts is there aren't many folks running them. GM tests the LS7 lifters for millions of miles in simulated torture tests before putting them in an engine. Then LOTS of people run them either in stock configurations or as a cheap swap on a heads/cam build. You seem them fail, but that's because they are being used outside of their design spec and are mercilessly beat on for thousands of miles. And the failure rate is probably pretty low all the way around.
Morel/Johnson/Isky/etc don't have a lot of street cars running them. No where near the same data that GM or Eaton would have for their lifters. We saw this with Yella Terra. We the consumer became the beta tester/guinea pig until they figured it out.
On a race car that's routinely torn down, you don't even consider this. You are going to destroy stock parts first time you run it, so you need parts that can handle the abuse, even if for short times.
I bought the Morels with the hope that they would easily take the abuse of increased spring pressures and much more aggressive ramp rates.
I'd like to hear from someone who sent them back to Morel. Morel will rebuild them. Might be worth their analysis to see what went wrong so A) it doesn't happen with a new/different lifter if it's problem in the setup and B) it doesn't happen to folks who own Morels. Without that beta-tested data, there can be no revisions or improvements.
The Johnsons are a different design. Short-travel. But apparently very well designed. But like most of these aftermarket parts, they've been recalled and redesigned already.
The problem with any of these high dollar parts is there aren't many folks running them. GM tests the LS7 lifters for millions of miles in simulated torture tests before putting them in an engine. Then LOTS of people run them either in stock configurations or as a cheap swap on a heads/cam build. You seem them fail, but that's because they are being used outside of their design spec and are mercilessly beat on for thousands of miles. And the failure rate is probably pretty low all the way around.
Morel/Johnson/Isky/etc don't have a lot of street cars running them. No where near the same data that GM or Eaton would have for their lifters. We saw this with Yella Terra. We the consumer became the beta tester/guinea pig until they figured it out.
On a race car that's routinely torn down, you don't even consider this. You are going to destroy stock parts first time you run it, so you need parts that can handle the abuse, even if for short times.
I bought the Morels with the hope that they would easily take the abuse of increased spring pressures and much more aggressive ramp rates.
I'd like to hear from someone who sent them back to Morel. Morel will rebuild them. Might be worth their analysis to see what went wrong so A) it doesn't happen with a new/different lifter if it's problem in the setup and B) it doesn't happen to folks who own Morels. Without that beta-tested data, there can be no revisions or improvements.