I've searched... Inconclusive. Does anybody make Ti valves for our motors? I'm thinking they would be better for higher RPM's.

 

The TI valves in the racing 4strokes made by Honda have a terrible reliability record. Several other bike makers running TI valves also have a very high repair rate for valve replacement. As a matter of fact, the popular mod is to dump the TI valves and go with SS. This to the point where there is a serious shortage of valve train components for many of those engines. Plus I'd imagine the limiting factor for the top RPM of the 5.4 is not the valves, but the rods etc.

 

Yeah, the plan was to go with rods that had a higher tensile strength, and to do Ti valves with good springs to get 6500 RPM's. I guess the Manley Inconel SS exotics will fill the bill. My STi had Ti valves that were sodium filled stock (IIRC).

I put SS in my CBR1100XX as well as my YZF400, and they rev very well.

 

It has been tried without success, due to not having any way to control valve float. The modular heads are just not designed for it.

 

Check out this thread for some great tech about ti valves in a street motor... http://web.camaross.com/forums/showt...itanium+valves

 

To gain more rpm capabilty would be to go with a solid roller setup. Our hydraulic lifters will bleed down at that rpm and take away the cam lift. So I was told by second street speed. I have thier solid lifter setup and plan to shift my motor around 6800 rpms.

 

HI!... My "UNBUILD" modded 5.4 goes to 6000RPM about 2 or 3 times a day on the way to, and from work. No problems here. The weak link in the 5.4 is the stock rods. Replace them with a good quality rod like a EAGLE or MANELY and you can go to 6500RPM all day with no problems. You just need cams and intake manifold/heads that will allow you to make power at those RPM levels.

 

i typically wouldnt use titanium valves in a street motor personally, but in a race motor it might be worth a try

 

Titanium valves are a waste of money in a MOD motor. I have talked to a couple of top notch shops that do head work and they all said its a waste of money. The valves are so small and light weight all ready there is no real advantage to be gained on going to titanium. If you build up a big block or a Windsor with big valve heads than titanium valves are good for those heads cause of the big weight savings over SS valves. The cost does not justify the small performance gain you might get out of a titanium valve.