BeaterShark

I pulled my engine this weekend. I checked each and every lifter. 14 were perfect. 1 (#6 intake) had some visual wear but passes the brail test. Another (#1 intake) is gone. It's got a "feelable" groove across the lifter face all the way around. I havn't pulled the cam yet, but I hope it's not toast too. Looking through the lifter bore, I can't really tell.

This is for my daily driver with a Comp Cams street roller with Endure-X lifters. I know many will say that I'm lucky to have gotten this much out of it, but I'm a little dissapointed. If anybody's interested, I can take some pics of the bad lifters.

Eddie 70

I would have expected a greater life out of that type of setup. What is the normal life span of a roller cam? I guess it all depends on how radical the cam is.

Fevre

Seems to me solid rollers would have lower life than any of the cams, just think of what is happening to those little wheels everytime they get against the cam.

Les

Yep, the spring pressure is very high. If they ever get solid roller cams & the required valvetrain to live like regular solid lifter cams I'll definitely get on board but I just don't like having to worry & wonder how soon something's gonna fail. On the plus side, the power potential is awesome.

MotorHead

If I get 30K out of mine I will be happy, that's 30K miles right, that's 5 years ?

GrandSportC3

I wonder how long my cam/lifters are going to live... My lift will be .676

gkull

What is your spring weight and cam specs exactly?

My other question is how much spring pressure did you loose in 30K miles.

I've posted before about dents in a roller lifter wheel and it also dented the billet steel roller cam. I had @ 20,000 miles and it failed during a road race at Thunder Hill in California. I was running the car hard and had 220+ water temp.

My K-motion 1.56 dia. springs had reduced from 195 pounds closed to nearly 175# when I replaced them.

Desertdawg

So how can GM get them to last for 100,000 miles in teh V6's.??????


Makes me think this is not only cheap, but should last a lot longer than the aftermarket stuff...

http://www.thirdgen.org/techbb2/show...hreadid=221883

Any opinions ????

Fevre

Are those solid rollers? I don't think GM has used any type of solid lifters since 72 vette.

Desertdawg

Yeah your right. my bad.

The Money Pit

The 355 I pulled had 120,000 miles on a Comp 268H cam I'd put in myself.Just a mild flat tappet hydraulic grind.In the 406 I went a bit more agressive and with the first XE-274 w/1.60 rockers I flattened a lobe in 2000 miles. The current XE-284 again with 1.60's has held up so far for around 15,000 miles. I pulled the valve covers last weekend to check, and everything looks OK.
In 25 years of building engines I'd never flattened any cam before,but the 406 is running the most agressive cam so far. I guess there is a price to pay when you try to squeeze more power out. I'm still not sold on the roller cam idea for a street engine. I've heard many problems in the non stock apps.I guess they're fine on the stock non lumpy variety,but once you try to bump up the power,the problems start.

BeaterShark

My cam is a Comp Cams XR274. It has 236/242 duration @ .050 and my 1.55 rockers give it .583/.589 lift. The spring pressures are 155/440 closed/open. This is theoretical as I do not have a spring tester. I'm not yet sure if I'm going to even check them. I'm in a completely different situation now (2 kids and wife no longer works) from when I first bought this engine and if I have to replace the springs, I'm going to a solid flat tappet setup due to $$$.


I have (going from memory here) 1.55" Isky springs. They are slightly stiffer than the Comp spring, but still within 3%-5%.


[Modified by BeaterShark, 8:12 AM 7/7/2004]

SmokedTires

30k miles seems pretty good to me. I dought I'll even try going 10k miles before changing the lifters & springs