From: "Jeff Whaley jwhaley@datacast.com" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Exhaust taming
Thread-Topic: [FlyRotary] Exhaust taming
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Date: Wed, 21 Jul 2021 15:37:44 +0000
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I have to agree Charlie, if bolting on the stock Mazda exhaust manifold giv=
es some of the best sound reduction at 15 lbs that is not a bad idea.  It l=
ooks like a best-fit for pusher aircraft (aimed in the right direction) but=
 I think it just might work for some tractor configurations as well.  I thr=
ew my exhaust manifold out during my engine conversion, opting for headers =
with the expectations of best horsepower and reduced weight; not sure if I =
got either; would be an interesting experiment to swap from what I have to =
that simplified and very solid install.
Jeff

Looks, in concept, very similar to what Ed Anderson tried many years ago wi=
th split-washers-on-allthread. Would be interesting to know what it costs i=
n power, & what it actually does to the exhaust. It *should* strip off the =
high frequency energy, which is the biggest battle for the rotary. Gotta wo=
nder about power loss, though. It's amazing what a good job Mazda did with =
manifolds on the old 13Bs in the cars. Paul Conner's SQ2000 was the quietes=
t rotary (or at least the least offensive) that I'd ever heard, until heari=
ng Dennis Haverlah's Renesis.
Attached is a pic of Paul's installation. It sounded almost like a small bl=
ock V8; very pleasing. And the total weight (~15 lbs) probably isn't any wo=
rse than most of the custom stuff we come up with today.

Charlie