These came out of a 13-1 iron headed small block. They have break in plus a couple 1/8 mile passes on them. Pistons and plugs looked great. They are Competition Products severe duty valves.
Whats up with these exhaust valves?
- Thread starter 19DUSTER73
- Start date
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72Dart6pack
Harder Better Faster Stronger.
If I was a betting man I'd say it piston material on your valves.
No more bets please! Hand waves left to right....... ( Dice rolls)
No more bets please! Hand waves left to right....... ( Dice rolls)
TrailBeast
AKA Mopars4us on Youtube
Dangit, I wanted in on that bet but you closed it too fast.
Looks like the telltale signs of detonation damage to me also.
Looks like the telltale signs of detonation damage to me also.
rustycowll69
Well-Known Member
if not that, have you been running without an air cleaner?
GeorgeH
Well-Known Member
X's 3 on detonation, which is not nice to bearings either.
I'll post a pick of a piston when I get home later today. They didn't have any noticeable golf ball type damage to them that I remember. Most of the engines run time was on e85 with 36 degrees of timing. Detonation was my first thought too but I was thinking I remember the pistons looked to good. I was running without an air cleaner. I'll have to examine the pistons closer so I can stop scratching my head. Thanks guys
nm9stheham
Well-Known Member
FWIW... a good read below. Never heard or read of the valves being pitted from detonation, but I surely don't know everything.
Engine Basics: Detonation and Pre-Ignition by Allen W. Cline
I also found mention of chlorinated solvents and Ti valves being a possible problem. Not sure if your valves are the Ti or Inconel ones listed....
Engine Basics: Detonation and Pre-Ignition by Allen W. Cline
I also found mention of chlorinated solvents and Ti valves being a possible problem. Not sure if your valves are the Ti or Inconel ones listed....
yellow rose
Overnight Sensation
Did you see the valves when they were new? I've never seen detonation do that to a valve. The piston would be done long before the valve. I could be wrong because I haven't seen everything.
That looks to me like the machining on the valve was done with a dull tool.
That looks to me like the machining on the valve was done with a dull tool.
TrailBeast
AKA Mopars4us on Youtube
It looks like chunks of aluminum that stuck to the steel valve surface from here.
You know how pictures are though.
It could be plug metal even, and not necessarily off a piston.
jeffnmo
Just another Mopar Maniac
Looks to me like blisters, are the valves coated With something?
Jeff
Jeff
The valves did not look that way when new. In person it does look like they are blistered. I'll fool with them some more tonight. I'll also try and dig up some info on the valves. They were purchased a few years ago and I can't remember the details on them.
rustycowll69
Well-Known Member
were there any additives added to the fuel tank?
yellow rose
Overnight Sensation
Well, that makes a difference. On my iPad they look like materiel was pulled from the face of the when it was machined. If they look like blisters then it is materiel transfer from somewhere else.
There were no additives used. Engine was broke in on sunoco 110 and switched to E85. I got to scratching some of the "blisters". Comes off like a chrome plating. Competition products says they are 21-4N stainless. Chrome plating is used in the description so I can only assume thats what it is. Its hard stuff to scratch off. Thanks for all the replies guys.
rustycowll69
Well-Known Member
I would have assumed any chrome plating would have been applied to the valve stems, for wear purposes, because stainless is relatively "soft", tough but relatively soft, subject to galling. But that is just speculation on my part.
I was thinking the same thing. Its dick hard so it must be some sort of coating lol
TrailBeast
AKA Mopars4us on Youtube
That'd suck if it causes hotspots in the cylinder.
I was cleaning up the valves and looking them over to maybe use in a new combo since they had so little run time on them. Wont be using them now. Had a little hydraulic issue with the old motor. I hit water when porting the heads so I epoxied it. From all my internet reading I learned that the ethanol probably softened the epoxy, it let go and leaked some water in the cylinder. Live and learn.
rustycowll69
Well-Known Member
been there, done that on a 440 CI head. I tried epoxy, that didn't work. Had to have them welded twice, before that worked. No fun.
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