Need engine advice N A 598 cubic inch rebuild
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10-14-2014, 03:43 PM
#32
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
10-14-2014, 03:56 PM
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10-14-2014, 08:14 PM
#35
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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
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
10-15-2014, 06:26 AM
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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
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.
10-15-2014, 06:32 AM
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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.
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.
10-15-2014, 06:33 AM
#38
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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.
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.
10-15-2014, 06:39 AM
#39
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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]
10-17-2014, 01:24 PM
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Looked at the build sheet the valves were PMB. The number on the valve is a stainless valve. Contacted Dart today they can repair the head also. Waiting on an email reply as to the cost. They said most Aluminum head atre easily repaired.
