Quote:
Originally Posted by Tokay444
Titanium itself does very well in extreme heat.
It's a great insulator.
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While Titanium is light and resistant to high temps it does not fatigue well. As @
CSG_Mike said, it will crack. Guaranteed. The best materials for headers in order are 304 ss, 321 ss, and 625 inconel. Although the materials are priced accordingly. And because of that 304 ss headers are most common.
321 headers are considerably more expensive but because of the materials fatigue resistance at high temps you can get away with thinner wall tubing and therefore a lighter header. Where .065" is suitable for 304 you can get away with 0.049" wall with 321. And same goes for inconel. Inconel headers can be insanely thin and still resist cracking. Like 0.029" wall thickness! If you ever get the chance to pick up a set of indycar, F1, GTLM, etc. headers they feel like tin foil. It's crazy!
Here is a more informative post on header materials:
http://www.enginelabs.com/engine-tec...-race-headers/