Bob Teague recently wrote about seat material ideally having a Rockwell hardness #s in the range of 40-50.
I am about to put custom seats into new aluminum heads and come to find out that the big $ copper beryllium seats I bought are pretty soft. Too soft according to the Teague on tech article.
Some specifics;
Running on 91 pump gas, 10 to 1 compression
Stainless 2.35" intakes, Inconel 1.88" exhausts (read heavy)
Fuel Injected.
closed cooling
Heavy spring rates
What is the consensus on seat material?
Thread: Best valve seat material?
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04-11-2010 12:08 AMLast edited by Ratickle; 04-11-2010 at 09:32 AM. Reason: Modified Title
32' Fever (Off to Syracuse) and 36"Gladiator; FORD powered
Cause somebody has to!
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04-11-2010 10:43 PMI bet he is speaking of, nickel colbalt alloy. I talked with my sales rep. from CV Products about this. There is a patent on this alloy, out side of that, they have not seen a reason to offer it. I questioned him on the copper alloy seats I use, as far as being soft, that I don,t believe. I have used many copper beryllium seats for pump gas, leaded racing fuels, NA and SC applications and have not had the seats pound out from being soft. I guess the question is: what is the heat transfer between copper and nickel. As far as the difference between the the intake seat and the exhaust are a different alloy in copper alloy seats. I have seen nickel and stainess valves have pits in them from water, meaning a inconel valve. Will a nickel colbalt alloy corrode? I haven't seen any beryllium copper corrode. I wouldn't worry about your seats as long as it was a spec. material from the mfg. either C.H.E., Precision Products, or CV Products. The cost should fall in between 20-27 $ each, intake being the most.
Maybe it's just a new sales pitch. I'll check again with CV and my other sources and get back with you. I questioned this about 3 months ago.www.merperformancemarine.com
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04-11-2010 11:11 PMThe heads came with iron seats. The Copper Beryllium are from Martin-Wells and they are 3/8" thick, same as the Ductile Iron. I have to refer back to my notes but I believe I was told a Rockwell hardness # of 30
I think the seats mentioned in that article were from Tucker.
.32' Fever (Off to Syracuse) and 36"Gladiator; FORD powered
Cause somebody has to!
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04-12-2010 06:49 PM
Rockwell C scale? I can test them for you if you want....
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04-12-2010 10:35 PMTurns out the Copper Beryllium seats I have are a Rockwell of 37 and a wear rating equal to 53. Not sure which Rockwell we are talking though, I assumed they would all use the same one.
Not sure but it feels like I may be making a mountain out of a molehill.
.32' Fever (Off to Syracuse) and 36"Gladiator; FORD powered
Cause somebody has to!