rickyd said:
Any Ti in the future? Or is it not even needed?
The cams will determine if titanium valves will be needed. Right now the valve acceleration rates used in these engines are still moderate enough to allow using heavier steel valves with cheap OEM springs.
Racers would be better served with a good quality stainless steel valve and a higher quality spring kit to handle the sustained revs.
Once the after-market guys start down the inevitable path of building cams that bang the valves open a lot faster, it will be tougher to control the weight of the OEM valvetrain parts, and lighter parts or at the very least better quality springs will be needed.
I've been talking with Mike Perry, head of R&D at Kibblewhite and they have stainless steel valves ready to go along with a racing spring kit.
I've also heard rumors that Xcelydyne has titanium valves for this motor in the works.
I'll be talking to these guys at Indy next week so I'll get some additional details and hopefully some pics of trick new bits. ;)