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On Feb 27, 2006, at 11:04 AM, Perry Mick wrote:
Joe, I would recommend using the stock exhaust manifold. At least during
your early flight testing. That is all I've ever used and it is bulletproof.
I just passed 560 hours TT. Experiment with mufflers later. I'm happy to
just continue using the stock manifold because it is worry-free. Broken
exhaust systems aren't good on pushers!
Reading this thread makes me think about the stock and aftermarket manifolds for the RX-7. One thing that the factory and reputable aftermarket have in common is that they are all built very heavy. My Racing Beat Headers on my NA car must be 1/4 or 3/8 of an inch thick, The stock turbo manifolds are very very thick cast iron, and guess what? They still develop cracks. Some of this is poor design of course, but I think on a pusher a point zero whatever thickness on anything in the exhaust sounds really fragile to me.
Hans
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