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911pcars 911pcars is offline
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Join Date: Jul 2000
Location: So. Calif.
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According to my bible, Aird's "Racer's Encyclopedia of Metals, Fibers and Materials", Honda uses ti from scrap aerospace applications for their con rods. Pretty clever. recook it in a plasma furnace and it's still cheaper than new ti. They apply molybdenum or chromium nitrate onto the thrust faces by flame or plasma spray to reduce ti's propensity to gall. The Honda con rod is 3Al-2Fe alloy and weight savings of 30% over steel.

The most common ti alloy for valves is 6Al-4Fe; same as used in many aerospace fasteners and used by Porsche for their ti con rods until it was replaced by 7Al-4Mo.

Race engine exhaust valves use 6Al-2Sn-4Zr-2Mo-0.08Si and more recently, 6Al-2Sn-4.0ZR-0.4Mo-0.4Si. Kinda rolls off the tongue, eh?

The Blackbird spy plane uses a ti alloy of 13V-11Cr-3Al.

Ti is very expensive, but the strange thing is that this is one of the most abundant raw materials on earth. It just takes expensive processes to manufacture, machine and weld it (currently).

Old 07-22-2004, 06:32 PM
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