pin lock ?

[Dwight Southerland]

Originally Posted by Alan Roehrich

Very few people use Tru Arcs anymore, as they are known to fail.

Really?? Alan, I'm not criticizing or correcting that statement, but I would really like some evidence. I have been involved in several "exotic" European-based engine builds in the past few years and every one of them were factory designed with TruArc type lock rings. These were everything from turbocharged four cylinder to NA 12 cylinder that run over 10K+ rpm and cost over $100K. I think the quality of the ring and the assembly specs are important for integrity, but I don't see failures when properly done. The Japanese like the wire locks because they are cheap (but effective).