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Post by holeshot on Apr 10, 2006 5:05:07 GMT -5
What are the good,the bad and ugly with titanium valves. other than they are lighter.
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Post by Maximum Race Engines on Apr 11, 2006 7:06:02 GMT -5
Titanium is mainly used because they are lighter. When you are using 2.350" intake valves in Big Chief heads that are over 6.500" inches long and buzzing the engine over 7500rpm, those valves can be really heavy. Titanium is used to prevent the springs from breaking, pushrods from flexing as much, etc... Titanium is stronger than steel and lighter than aluminum. They also dissipate heat faster than steel. But, they are a softer material. They will not last long in a street engine, nor are they designed for such application. Stainless valves are fine for 85% of the engines out there. It is just that once you get to a specific application, whether it be big diameter valves, long stems, alot of rpm, etc..you wont need them. Cost is also an issue. The disadvantage I see with them, as they wear out faster due to the softer material. I would run beryllium seats with them as they are a softer seat and also dissipate heat better. Not only due to cost, but they are just not practical in your everyday 500hp engine. Hope this helps.
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Post by 67RS502 on Apr 11, 2006 11:55:27 GMT -5
speakin of everyday 500hp engine...
why does the new Z06 427 use tit. valves?
and whats done to make them last a lot of miles?
I hear some of the exotics use tit. valves also.
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Post by Maximum Race Engines on Apr 12, 2006 7:32:47 GMT -5
All the newer engines that are produced with titanium valves and aluminum blocks etc....at 500hp do not see the amount of stress that 1000-1500 hp race engines see. Big difference in how parts hold up with change in power levels. Nobody said these parts CAN'T be used on the street. But the more power you make, the more stress is put on these parts which become maintenance items. Newer engines don't see 14.5-16.1 compression, etc...Besides if the budget allows for an aluminum block and titanium rods and valves, etc...for a 450-500hp street engine, then by all means, go for it.
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