Performance Boats Forum banner

1 - 7 of 7 Posts

·
Premium Member
Joined
·
5,488 Posts
Discussion Starter #1
While tearing into my 468 for removal I pulled all the lifters and saw this on #2-cylinder.
I can't 'feel' the mark but I can see it.
My guess the Lifter stopped spinning...would you agree?
The cam lobe looks fine.
You can see the round halo from when it was spinning but who knows why it stopped...maybe a speck of hard debris between the two surfaces. I'm done with flat tappet cams:)st

 

·
Boat Nut
Joined
·
5,131 Posts
Hammer that may have happened long ago, we see that in aircraft engines, that sit for periods of time with out use. Usually it's attributed to built up moisture in the crankcase. Rust will form, pitting the lifters, and or cam. Some times the lifters are just scared from the rust, or the lifter will just eat it's self, taking out the cam. ofter this is unnoticed untill too late, or it's found when torn down for overhaul. Time to step up to rollers, and safety screens.
 

·
Premium Member
Joined
·
5,488 Posts
Discussion Starter #3
Thanks for the feedback ^
I'll tell ya not much time at all on that cam and lifters, maybe a few seasons/run-time. And, I always fully backed off the valve adjustment during the off season.
 

·
mo balls than $cents$
Joined
·
11,734 Posts
comp cams has some nice solid rollers that don't require the normal 200psi+ seat pressure and big open pressures a billet cam does. ya might check into them. with such low spring pressures, valvetrain lives alot longer and the valves will live a good long life. i'm using 1 and have had great luck with it. i run 170lbs seat, 450 open and the cam revs to 7k no probsssss. you just can't beat the performance of a roller cam, wether it be solid or hyd.
 

·
One part at a time...
Joined
·
463 Posts
Hammer that may have happened long ago, we see that in aircraft engines, that sit for periods of time with out use. Usually it's attributed to built up moisture in the crankcase. Rust will form, pitting the lifters, and or cam. Some times the lifters are just scared from the rust, or the lifter will just eat it's self, taking out the cam. ofter this is unnoticed untill too late, or it's found when torn down for overhaul. Time to step up to rollers, and safety screens.
What are these "safety screens"? Are they the ones that go in the lifter valley? Are they put anywhere else?
 

·
Registered
Joined
·
4,045 Posts
I was looking for a new cam for my 468 and I was going to go with a Hyd. So I called Chris S. and what he told me made good sence! Most all manufactures Ford, Chevrolet, Dodge,ETC have all gone to roller cams in their factory setups, whitch is true! This in turn has lead to a slackness in the metal properties(sp?) of the cams and lifters not holding the same specs.for aftermarket supplies! Not All are bad just those that are afordable on the market! Simpley put cams and lifters (solids and hyd.flats) are not as durable as they used to be! I hope I got this all right in laymans terms! LOL! WT:)devil
 
1 - 7 of 7 Posts
Top