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Originally Posted by the mayor
(Post 4202358)
Link pic of the head I don't have pics of the piston with me.
http://i927.photobucket.com/albums/a...929_204943.jpg Man that's an easy fix. Should have seen mine after I detonated it and bent the intake valve over... There was no combustion chamber valve seats nothing. Valve seats ended up in the other bank of the motor hanging valves open. Little welding couple seats valves and good as new. That's the nice thing about aluminum. |
Cant tell from the pic, is the valve guide out of round/wore out?
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dudnt i give you the build folder ? i just looked and cant find it here . . im sure its in that boat folder i gave you . all the specs on the motor n parts are in it ... let me know ill look around some more . valves are pbm if i recall , its been a while though
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Rob I have all the information. Just have not looked at in a while.
Thanks Tim |
Originally Posted by Wobble
(Post 4202863)
Cant tell from the pic, is the valve guide out of round/wore out?
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looks like a non iconel valve failure, but not sure what they were yet? are the ferrera Inconel or another metal? I use the manley now, never again taking a chance of that issue.
I know anything can fail but tons of guys told me they never saw a manley Inconel break so I went with them...whow knows if it's true or not, to me anything can break and will haha |
Originally Posted by Full Force
(Post 4203093)
looks like a non iconel valve failure, but not sure what they were yet? are the ferrera Inconel or another metal? I use the manley now, never again taking a chance of that issue.
I know anything can fail but tons of guys told me they never saw a manley Inconel break so I went with them...whow knows if it's true or not, to me anything can break and will haha While I do agree that using a high temperature tolerant exhaust valve of their nature, is a necessity on a marine engine, that alone isnt enough to close the book on things. Cutting the valve seat width too narrow, can lead to valve overheating. The majority of heat from the valve, is transferred to the cylinder head, when the valve contacts the seat. Alot of shops, try to cut narrow seat widths, in an effort to improve air flow. While that may be true, you do not want to compromise exhaust valve cooling, by doing so in a marine application.Same goes for valve seat materials. Some are more tolerant to extreme temps better than others. So, aside from using the inconel or ferrea super alloys, one must also have the proper valve seat widths, proper fuel mixture, no water contamination to the exhaust valves from a leaky header, manifold, or reversion, if you do not want this situation to happen. |
Originally Posted by MILD THUNDER
(Post 4203278)
Ferrea claims their "Super Alloy" exhaust valves can withstand up to 2400 degress, where I believe inconel is rated to 1800 degrees.
While I do agree that using a high temperature tolerant exhaust valve of their nature, is a necessity on a marine engine, that alone isnt enough to close the book on things. Cutting the valve seat width too narrow, can lead to valve overheating. The majority of heat from the valve, is transferred to the cylinder head, when the valve contacts the seat. Alot of shops, try to cut narrow seat widths, in an effort to improve air flow. While that may be true, you do not want to compromise exhaust valve cooling, by doing so in a marine application.Same goes for valve seat materials. Some are more tolerant to extreme temps better than others. So, aside from using the inconel or ferrea super alloys, one must also have the proper valve seat widths, proper fuel mixture, no water contamination to the exhaust valves from a leaky header, manifold, or reversion, if you do not want this situation to happen. |
Originally Posted by MILD THUNDER
(Post 4203278)
Ferrea claims their "Super Alloy" exhaust valves can withstand up to 2400 degress, where I believe inconel is rated to 1800 degrees.
While I do agree that using a high temperature tolerant exhaust valve of their nature, is a necessity on a marine engine, that alone isnt enough to close the book on things. Cutting the valve seat width too narrow, can lead to valve overheating. The majority of heat from the valve, is transferred to the cylinder head, when the valve contacts the seat. Alot of shops, try to cut narrow seat widths, in an effort to improve air flow. While that may be true, you do not want to compromise exhaust valve cooling, by doing so in a marine application.Same goes for valve seat materials. Some are more tolerant to extreme temps better than others. So, aside from using the inconel or ferrea super alloys, one must also have the proper valve seat widths, proper fuel mixture, no water contamination to the exhaust valves from a leaky header, manifold, or reversion, if you do not want this situation to happen. |
1 Attachment(s)
This was a couple years ago when I got a fuel line clogged with **** from the gas tank Dominic go over said he has never seen inconel valve do that before thank god I had good valves![ coula been worseATTACH=CONFIG]531037[/ATTACH]
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