Could it be that the lifters I'm using are not rated for higher rpm? I'm spinning the motor to around 6500? 
What causes a collapsed lifter???
What causes a collapsed lifter??? I am just curious as to what I am doing wrong. This will be the third collapsed lifter in two weeks. I am running a car with the mods in sig. The lifters I have been using are stock LS1 lifters. they have been working fine up till now. Since the rebuild the engine has about 8-9000 miles on it. It seems like all my lifters are starting to go at the same time. Obviously I am puttig too much strain on the lifters, but I was just curious what causes a hydrollic lifter to collapse.
I am just curious as to what I am doing wrong. This will be the third collapsed lifter in two weeks. I am running a car with the mods in sig. The lifters I have been using are stock LS1 lifters. they have been working fine up till now. Since the rebuild the engine has about 8-9000 miles on it. It seems like all my lifters are starting to go at the same time. Obviously I am puttig too much strain on the lifters, but I was just curious what causes a hydrollic lifter to collapse.
I am pretty sure they are 7.200. honestly I don't remember, I have a build sheet but It's in storage. I have a set of stock LT1 lifters, but didn't want to use them cause I thought they wouldn't handle it. they have about 120k on them
Last edited by ryle; Feb 18, 2009 at 12:38 PM.
You can get LS7 lifters for like 140. I'd do that. I'd check your lifter bores to see that they are not rough or scored. They might need deburring.
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I see you have an aftermarket Melling pump. Check to make sure that the screen isn't plugged and that the oil pickup didn't fall off. If oil delivery is restricted to the lifters (plugged oil galley or low oil pressure), the lifters won't "pump up" to take up the normal slack in the valvetrain.
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looks like I'm gonna end up with some new lifters and pushrods If the pushrods are too long, then the valve won't fully seat and cause a rough idle. Correct me if I'm wrong, but I'm pretty sure that can't cause a lifter to collapse, as the valve is on the operating end of the rocker arm.
JK, ryleLook at the bright side, maybe you'll dyno more than 320 this time around.
thanx bud, I needed that. I should have checked the length in the first place, but I was a noob and didn't know a whole lot about internal engine or valvtrain geometry. I just trusted the engine builder who did my heads on the pushrod length. This time around I'm doing it right. the only problem is that the washers on two of my SA rockers have some bad spots on them where they came down on the valve from it being too loose after the lifter collapsed.
thanx bud, I needed that. I should have checked the length in the first place, but I was a noob and didn't know a whole lot about internal engine or valvtrain geometry. I just trusted the engine builder who did my heads on the pushrod length. This time around I'm doing it right. the only problem is that the washers on two of my SA rockers have some bad spots on them where they came down on the valve from it being too loose after the lifter collapsed.
on Lt1's if the rod is too long it will fully seat, but the rocker will not be on the center of the valve as it should be. I am not sure the name for the design, but i know that the rockers aren't torqued down, but rather they are set to zero lash
as far a quick check, I colored the top of the valve with a marker, and then did a couple revolutions on the motor. The place that was wore off was low and to the outside of the head, which means that the pushrod is too long. correct length would be in the center of the valve stem.
I remember the brand, I looked at their website and it doesn't mention anything about being rebuildable. Maybe it's time to get some Comp ProMags...
https://ls1tech.com/forums/non-lsx-p...block-etc.html
as far a quick check, I colored the top of the valve with a marker, and then did a couple revolutions on the motor. The place that was wore off was low and to the outside of the head, which means that the pushrod is too long. correct length would be in the center of the valve stem.