01-20-2010, 08:59 AM
Join Date: Oct 2008
Location: SoCal, Dana Point
Here's your answer.....
I know a little about titanium alloys, having started a knife company - missionknives.com, we specialize in making titanium knives for the military. There are around 150 grades of titanium and titanium alloy. The most common are the CP's - commercially pure's and Alpha-Beta alloys such as Grade 5 6Al-4V (6% Aluminum, 4% Vanadium, 90% Titanium) which, if you were to compare its properties to Steel, is equivalent to 316 stainless. Anyway, titanium is a self-healing metal which means that it immediately forms titanium oxide on its surface to protect it from rusting. So basically, it forms a ceramic-type coating on its surface naturally. Not sure what they are coating the valves with, maybe Titanium Nitride? The purpose of this would be if the titanium would come into contact with other titanium such as in the valve guides. Anytime you rub titanium against titanium, you get galling, hence the purpose of the coating.
'08 CBR1000RR Repsol
* Shiritaki clutchUps (boron titanium)
* Valjoux 7751 timing
* Shotokan 7075-T73 Flat Rounds
* Shimizkai Fronts (carbonium nitride)
* Hayoto Tripacks (trilithium phosphate)
* Takumi RearIrons (gamma titanium)
* Haruto Liners (copolyester elastomer)