X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f223.google.com ([209.85.218.223] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3882909 for flyrotary@lancaironline.net; Mon, 12 Oct 2009 00:01:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.223; envelope-from=lehanover@gmail.com Received: by bwz23 with SMTP id 23so1842923bwz.19 for ; Sun, 11 Oct 2009 21:01:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=A4jgN/oWmZNK3bSQSTFaOObqBOGw61uO23oIvySx1Cg=; b=q0DzpI99UWayhZwTty8ekGzamk52/BCPPK3rqv3V+hnuFbNPJr14Q5CKdTN+ploMJp PYwmLzSZsEwBGG5c+R4OIq+x3dcOK/GQqFcOe9oQ+ykWKSzEpYfh6wAoFQblZIkmcOBv 4WKsdJrfRAsHQQJyXGVo4ixNTmxMKX1nEyXVQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=psbMXw9jmEvkilr8CDPUGmgQRAxKKVNpETTb+4Hwvf1nyl+BBKgG654laEGcRc5/Oj qeBEyTUs+DPD8B2byrWhcO40eqGU6WmuqLHSVWIYLD5q6J2o6041Yae3Q9sFHD301XFm UcqswmV9rIE++cDoNEl3bJ/idGCREdF+azpTs= MIME-Version: 1.0 Received: by 10.204.3.22 with SMTP id 22mr4625691bkl.181.1255320079026; Sun, 11 Oct 2009 21:01:19 -0700 (PDT) Date: Mon, 12 Oct 2009 00:01:19 -0400 Message-ID: <1ab24f410910112101s21d96b17mac393129560c492f@mail.gmail.com> Subject: FlyRotary] where's the missing power? From: Lynn Hanover To: flyrotary@lancaironline.net Content-Type: multipart/alternative; boundary=0015174bec1c63c9a00475b4fb65 --0015174bec1c63c9a00475b4fb65 Content-Type: text/plain; charset=ISO-8859-1 1) The engine is a Bruce Turrentine built. Turbo housings and high >> compression NA rotors. No porting. >> >> 2) The exhaust is a true 2 - 1 header with equal length primaries. >> I'm a little sketchy on dimensions but my recall is 1 3/4" primaries, >> 32" long and equal length into a Burns merge collector 2 1/2". >> Muffler is 4" behind the collector, 2 1/2" inlet and outlet, 28" >> long, 4 1/2" diameter. It's a spiral flow design, homebuilt, with a >> relatively large straight tube through the middle. I dont believe it >> presents any significant restriction. Internals are Inconel and it >> was in good shape when I had it off the airplane a couple of weeks ago. Your exhaust system sounds to be near perfect. I would not suspect problems there. Perhaps TDC mark may be in error. Actual ignition advance between 20 and 25 degrees? Poor inlet shape on TB. Needs trumpet bell. F/A around 12.7. EGTs 1600 to 1675? Lynn E. Hanover --0015174bec1c63c9a00475b4fb65 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
=A01) The engine is a Bruce Turrentine built. Turbo housings and high =
>> compression NA rotors. No porting.
>>=A0
>>= 2) The exhaust is a true 2 - 1 header with equal length primaries.
>= ;> I'm a little sketchy on dimensions but my recall is 1 3/4" p= rimaries,
>> 32" long and equal length into a Burns merge collector=A0 2 1= /2".
>> Muffler is 4" behind the collector, 2 1/2"= inlet and outlet, 28"
>> long, 4 1/2" diameter. It'= ;s a spiral flow design, homebuilt, with a
>> relatively large straight tube through the middle. I dont believe = it
>> presents any significant restriction. Internals are Inconel= and it
>> was in good shape when I had it off the airplane a cou= ple of weeks ago.
=A0
=A0
Your exhaust system sounds to be near perfect. I would not suspect pro= blems there.
=A0
Perhaps TDC mark may be in error. Actual ignition advance between 20 a= nd 25 degrees?
=A0
Poor inlet shape on TB. Needs trumpet bell.=A0
=A0
F/A around 12.7. EGTs 1600 to 1675?
=A0
Lynn E. Hanover=A0
=A0
=A0
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