Best high performance Valve material 3

[cofactors]

What is the best valve material for a high performance drone engine, have tried 17-4ph does not do well at higher temps (above 900F) valve diameter is .54 for intake .49 for exhaust. The engines I have developed are a four valve per cylinder Dual Overhead Cam boxter twin similar to a BMW motorcycle. We are curently developing a larger version of 270 cc. I have tried to find SAE EV8 (UNS 63008) have not had any luck, it seems to only be availabe to valve mfg. that have this alloyed...... any ideas??? would "Nitronic 60" that has been Ion Nitrided be a good choice????
We manufacture these engines from the ground up that includes almost all parts of the engine minus screws and bearings

Thanks
Cofactors

 

[Fabrico]

SAE EV8 (UNS S63008) stainless is a good choice for intake and exhaust. Stems are best chromed, or the entire valve can be black nitrited. That material is extremely popular for race valves and should not be hard to find. Of course you could let a reputable company make valves for you. Nearly all are one-piece forged, are you doing this too?

 

[EdStainless]

There is a specialty steel company in upstate NY that makes a lot of valve steel. Maybe one of their tech guys can give you lead on where to go (hint, hint).

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http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[rd400guy]

Crucible Specialty Metals is the leading producer of valve steels (I don't work there anymore, so this isn't as much of a sales pitch). Here's the valve steel info page:

http://www.crumetals.com/products/valve.cfm

Talk to someone from their service center, regarding stainless, tell them what you're doing, and they'll get you to the right person. I'm imagining you're looking for somewhat small quantities, so they should be able to help you out.

http://www.crucibleservice.com/index.cfm

 

[AllenR]

The best material offered in tubo NG industrial engines is Inconel 751 with a Triboloy coating on the seat. You might try these guys.

http://www.c-m-c.com

 

[grampi1]

Also try aluminizing

 

[Flamefront]

You can use an environmental barrier coating and not upgrade the core material, if you are having a surface problem (wear or corrosion).

Lots of race teams use PVD applied coatings on valves, which gets pricey when it is applied via PVD or CVD.

A new nano-scale zirconia oxide coating is available from

http://www.cccintl.com

that is priced lower than PVD versions and works well. I am testing some of this company's infused surface treatments on some engine parts as we speak, using a cerium oxide nano-film, with good results so far.