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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 26 Feb 2008
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Lightbulb yamaha XT600E titanium valves
Hey guys...
What benefits would my XT600E get with new titanium valves?

Thanks

Vando Serpa
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  #2  
Old 26 Feb 2008
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Your wallet would be lighter
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Old 26 Feb 2008
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I think the theory would be that Ti valves, being lighter, would be able to allow faster revs, giving you a broader range of power?

Matt
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Old 26 Feb 2008
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Hi...

Matt i'm thinking of the Ti valves because they are supposed to be much stronger than OEM and because of what you just said


Vando
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Old 26 Feb 2008
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On a performance bike lighter valves mean lighter valve springs, which means less valvetrain friction and less load on the cams, etc. Less reciprocating mass allows for higher revs, and if the bike's tuned to suit, more top end power.

On a modestly tuned 600 single you won't see any benefit at all, either in performance or reliability.
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Old 6 Mar 2008
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Oh, and I forgot to mention I also got my eyes on a new stage-1 camshaft for my XT just my eyes tho...because it's 210euros haha
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Old 6 Mar 2008
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Quote:
Originally Posted by MarkLG View Post
On a performance bike lighter valves mean lighter valve springs, which means less valvetrain friction and less load on the cams, etc. Less reciprocating mass allows for higher revs, and if the bike's tuned to suit, more top end power.

On a modestly tuned 600 single you won't see any benefit at all, either in performance or reliability.

Quite so - an XT is an XT, for all that (apology to Rabbie Burns).

Now, if you were talking about an R6 or an R1! .
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Old 20 Mar 2008
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titanium valves
where can one get titanium valves for the xt600?
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Old 21 Mar 2008
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titanium valves
On this bike, titanium valves would not do much for higher revs. The limiting factor for the revs on this bike, due to it's piston mass and stroke, is piston speed/acceleration. What lighter valves would do is that you can use a "faster cam" with earlier opening and higher lift. These factors all increase the acceleration of the valve components. The forces on the valvegear is the mass of the valve, cap, retainers+ half that of the springs. And force is mass x acceleration. The springs are designed to compensate for this acceleration + 50% preload for proper sealing. So to say it in fewer words, you won't get more revs, but you get more power due to faster filling of the combustion chamber, hence higher combustion pressure.

Titanium caps would also help. Titanium springs need to be larger diameter than steel due to its lower modulus, which is half that of steel. This to get the same springrate as to that of a steel spring.
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Old 21 Mar 2008
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like my gran used to say, you can't polish a turd! (only joking to all you xt owners....)
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Old 23 Mar 2008
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I dunno, my turd is pretty dang polished! Or, powder coated anyway. My "turd" can keep up with any of the sport bikes I've ridden with, just not on the long straight stretches.
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Old 23 Mar 2008
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Hey motordude, do you know where titanium valve caps and high tension titanium springs can be found? I'm always looking for new ways to improve/modify my bike. It's kind of a dissease that I have. All of my toys are heavily modified. It's kind of fun.
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Old 24 Mar 2008
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where to get titanium springs etc
Hello,
sorry don't know where to get these items, I've seen some around somewhere, but they were for cars. I don't think that titanium springs would fit any motorcycle. Take a look at the valve springs in your cylinderhead, they are a pretty close fit. Titaniumsprings would be considerably larger, or the distance between the windings would be much grater, to get the same springrate as that of steelsprings. If the distance between the windings increase, so does the tension in the springs, they would break very soon.

On the valvecaps, the easiest would be to have them machined from billet titanium. Won't be cheap, but if you gotta have it....You don't have a friend in a machineshop? Use titanium grade5, it's the strongest. Titanium is not as difficult to machine as people tend to say, I have had no problems with it.

Best of luck to you!

regards
John
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Old 25 Mar 2008
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Personally I find the best performance enhancing modification on an XT600 is to go on a diet. I can lose more weight in a month than I can by lightening/drilling/replacing bits with expensive parts. It also saves money rather than spending it.

Richard
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Old 25 Mar 2008
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that only works if you have weight to loose.
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