X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 920925 for flyrotary@lancaironline.net; Sat, 30 Apr 2005 20:33:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050501003249.DNGO2434.imf17aec.mail.bellsouth.net@rd> for ; Sat, 30 Apr 2005 20:32:49 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: NA vs Turbo Re: Ed's new rotor housings Date: Sat, 30 Apr 2005 19:32:50 -0500 Message-ID: <006001c54de5$4e2b3070$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C54DBB.65552870" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C54DBB.65552870 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I couldn't remember what the decision was on these splitters, so I did = some research, and pasted the quotes I found below. Unfortunately, I still = don't know the answer. Lynn, Leon, what say you? Rusty (shopping for sandbags) =20 The following quote is from Tracy's squawk_muffler page, and would tend = to suggest that there isn't much HP to be gained with the turbo housings, though he isn't making a definitive statement to that effect. =20 March 3, 2001 Mufflers.. the Saga Continues=09 ... Now the question is, If all other things are equal, is there any significant power difference between the turbo and non turbo rotor = housings? Ever done an A/B comparison on this? I did have a small increase in = power when I changed to turbo housings but that was comparing an old junkyard = dog engine with lower compression rotors to a freshly blue printed engine = with high compression rotors. If it turns out that there is no significant difference in power, we've been going down the wrong path with the = turbo housings. And here I am with a brand new 20B with turbo = housings.......... The following quote is from the archives, about 6 weeks later. This = would suggest (second hand) that Bruce thinks there is significant HP to be = gained by using the turbo housings. =20 Date Wed, 18 Apr 2001 103007 -0700 From "Mike Wills" Subject Re Engine Selection for 13B Bob, I discussed this with Bruce Turrentine who is currently assembling an = NA engine for me. It just so happened that Tracy mentioned his conclusions about using the splitter equipped housings when Bruce was buying the = parts to build my engine. Bruce told me the NA housings would likely cost as much as 15-20HP. = After discussing the options with him I decided to go ahead with the turbo housings.=20 (the rest snipped) ------=_NextPart_000_0061_01C54DBB.65552870 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I couldn't = remember what=20 the decision was on these splitters, so I did some research, and pasted = the=20 quotes I found below.  Unfortunately, I still don't know the = answer. Lynn,=20 Leon, what say you?

Rusty (shopping for = sandbags)

 

The following quote is from Tracy's squawk_muffler page, = and would=20 tend to suggest that there isn't much HP to be gained with the turbo = housings,=20 though he isn't making a definitive statement to that=20 effect.  

March 3, = 2001 =20 Mufflers.. the Saga Continues
... Now=20 the question  is,  If all other things are equal, is = there any=20 significant power difference between the turbo and non turbo rotor = housings? Ever done an A/B comparison on this?  I did have a = small=20 increase in power when I changed to turbo housings but  that = was=20 comparing an old junkyard dog engine with lower compression rotors = to a=20 freshly blue printed engine with high compression = rotors.   If=20 it turns out that there is no significant difference in = power,  we've=20 been going down the wrong path with the turbo housings.  And = here I=20 am with a brand new 20B with turbo=20 = housings..........

The = following quote is=20 from the archives, about 6 weeks later.  This would suggest = (second=20 hand) that Bruce thinks there is significant HP to be gained by = using the=20 turbo housings.   


Date=20 Wed, 18 Apr 2001 103007 -0700
From "Mike Wills"=20 <willsm@spawar.navy.mil>
Subject Re Engine Selection for=20 13B

Bob,

  I discussed this with Bruce Turrentine who = is=20 currently assembling an NA
engine for me. It just so happened that = Tracy=20 mentioned his conclusions
about using the splitter equipped housings = when=20 Bruce was buying the parts
to build my engine.
  Bruce told = me the NA=20 housings would likely cost as much as 15-20HP. After
discussing the = options=20 with him I decided to go ahead with the turbo
housings.

(the rest snipped)

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