Jim Brady broke a RA-IV valve (two piece) after a burn-out in the box as he was idling up to the starting line at Broadway Bob's track in Wisconsin.
The head came off, flipped over, and the engine stopped. Locked up. (Hint: if the engine stops suddenly, do not crank over the engine. Put a 15/16" socket on the crank and try to bar it over first.) By doing this, Jim was able to remove the head with no damage to it, replace the valves with one piece valves, and inspect the thick top (heavy) forged TRW piston. Piston was fine, rod was fine, bearing was fine. VERY LUCKY guy, Jim B!
So I will never run a RA-IV valve in any performance application based on that deal.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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