X-Virus-Scanned: clean according to Sophos on Logan.com From: Received: from omr-m013e.mx.aol.com ([204.29.186.14] verified) by logan.com (CommuniGate Pro SMTP 6.1.9) with ESMTPS id 8567373 for flyrotary@lancaironline.net; Mon, 11 Apr 2016 15:38:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.29.186.14; envelope-from=Lehanover@aol.com Received: from mtaomg-mcb02.mx.aol.com (mtaomg-mcb02.mx.aol.com [172.26.50.176]) by omr-m013e.mx.aol.com (Outbound Mail Relay) with ESMTP id 567283800040 for ; Mon, 11 Apr 2016 15:38:11 -0400 (EDT) Received: from core-mua005b.mail.aol.com (core-mua005.mail.aol.com [172.29.237.145]) by mtaomg-mcb02.mx.aol.com (OMAG/Core Interface) with ESMTP id B124C38000084 for ; Mon, 11 Apr 2016 15:38:10 -0400 (EDT) Full-name: Lehanover Message-ID: <69e05d.6b0e7d60.443d5722@aol.com> Date: Mon, 11 Apr 2016 15:38:10 -0400 Subject: Re: [FlyRotary] Re: Intake Styles and Data To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_69e05d.6b0e7d60.443d5722_boundary" X-Mailer: AOL 9.8 sub 2019 X-Originating-IP: [65.32.224.140] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1460403491; bh=pE9fkPHm+kQ102LyxYVamO3po/WTau2oxDL1+mwGnNA=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=RTN/Ftu9295oGP8rPzf6D4hexn8NFb4N+Y7fwFEeTDyx0wi3AWt4VPtKSZtzsUN4X 2xPCZVjxWEO63sAEI9zIil0Ys6dOw9DF1rFvKDvy5OF3cMJlEW7votnwPy3rjBbHBh jLf1ByVXhjcJHG4zK71TTnwm2/IjjlXsZY062zHE= x-aol-sid: 3039ac1a32b0570bfd2208e6 --part1_69e05d.6b0e7d60.443d5722_boundary Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en For intake lengths, the ideal is the enemy of the good. There is only one= =20 perfect length and diameter for each full throttle RPM. So a very large=20 number of lengths and diameters work very well for AC use. Tracy's Race= winning=20 engine had rather short compact tube lengths and outran everybody. My=20 racer has 170 HP at 6,500 RPM and 250 HP at 9,600 RPM from a 12A engine= with=20 2292 CCs. This with a very large bridge port. The 13Bs you are building= are=20 bigger with 2,606CCs.=20 =20 The engines tune like a 2 cycle dirt bike. The exhaust system makes a far= =20 bigger difference than does the intake design. My Drummond built race=20 engines us a stock intake manifold gasket. The intake runners are polishe= d but=20 NOT enlarged. You want the highest possible intake flow velocity at every= =20 RPM. The intake manifold to mount a Weber 48 IDF has a plenum below each= =20 throat so the actual runner length is very short. This in turn tunes a bi= t=20 better at stupid high RPM but works well enough to deliver good performan= ce=20 above 6,000 RPM. You would not have to add much length beyond the stock= lower=20 manifold to be about perfect for aircraft use. The HP is in the exhaust= =20 system. The side port engines have fewer degrees of overlap than does a= Pport=20 (Massive overlap). Renesis has no overlap at all. Smoother the idle for= less=20 the overlap. =20 Lynn E. Hanover Racing rotaries since 1980. =20 =20 =20 In a message dated 4/11/2016 12:38:17 P.M. Eastern Daylight Time, =20 flyrotary@lancaironline.net writes: =20 Actually on paper I=E2=80=99m still the CEO of the company but all the da= y to day=20 operations are handled by Laura since my retirement. She has been a grea= t=20 business partner.=20 Tracy=20 Sent from _Mail_ (https://go.microsoft.com/fwlink/?LinkId=3D550986) for= =20 Windows 10=20 =20 From: _ARGOLDMAN_ (mailto:flyrotary@lancaironline.net)=20 Sent: Monday, April 11, 2016 8:29 AM To: _Rotary motors in aircraft_ (mailto:flyrotary@lancaironline.net)=20 Subject: [FlyRotary] Re: Intake Styles and Data =20 =20 =20 Thanks for the link. =20 =20 Actually, The company is owned by Laura, Tracy's EX. (reminds me of the= =20 license plate of a Mercedes, in my area," WAS HIS" =20 =20 Although they don't have aviation parts any more, they still stock a=20 complete line of Tracy's seals, rebuild kits etc. =20 =20 Rich =20 =20 =20 In a message dated 4/10/2016 9:28:09 P.M. Pacific Daylight Time, =20 flyrotary@lancaironline.net writes: Sorry for lack of detailed info; I was away from home & pecking at my=20 phone to reply. Wayback machine: https://archive.org/web/ Tracy's old website was: http://www.rotaryaviation.com/ =20 which no longer has aviation info on it (currently only car performance = =20 parts under different ownership).=20 =3D --part1_69e05d.6b0e7d60.443d5722_boundary Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
For intake lengths, the ideal is the enemy of the good. There is only= one=20 perfect length and diameter for each full throttle RPM. So a very large nu= mber=20 of lengths and diameters work very well for AC use. Tracy's Race winning= engine=20 had rather short compact tube lengths and outran everybody. My racer has= 170 HP=20 at 6,500 RPM and 250 HP at 9,600 RPM from a 12A engine with 2292 CCs. This= with=20 a very large bridge port. The 13Bs you are building are bigger with 2,606C= Cs.=20
 
The engines tune like a 2 cycle dirt bike. The exhaust system makes= a far=20 bigger difference than does the intake design. My Drummond built race engi= nes us=20 a stock intake manifold gasket. The intake runners are polished but NOT=20 enlarged. You want the highest possible intake flow velocity at every RPM.= The=20 intake manifold to mount a Weber 48 IDF has a plenum below each throat so= the=20 actual runner length is very short. This in turn tunes a bit better= at=20 stupid high RPM but works well enough to deliver good performance above 6,= 000=20 RPM. You would not have to add much length beyond the stock lower man= ifold=20 to be about perfect for aircraft use. The HP is in the exhaust system. The= side=20 port engines have fewer degrees of overlap than does a Pport (Massive over= lap).=20 Renesis has no overlap at all. Smoother the idle for less the=20 overlap.
 
Lynn E. Hanover
Racing rotaries since 1980.     
 
In a message dated 4/11/2016 12:38:17 P.M. Eastern Daylight Time,=20 flyrotary@lancaironline.net writes:

Actually on paper I=E2=80=99m still the CEO of the= company but all=20 the day to day operations are handled by Laura since my retirement. = ; She=20 has been a great business partner.

 

Tracy

 

Sent from Mail for= Windows=20 10

&nb= sp;

From: ARGOLDMAN
Sent:=20 Monday, April 11, 2016 8:29 AM
To: Rotary motors in=20 aircraft
Subject: [FlyRotary] Re: Intake Styles and=20 Data

&nb= sp;

 

 

 

Thanks=20 for the link.

 

Actually,=20 The company is owned by Laura, Tracy's EX.  (reminds me of the lice= nse=20 plate of a Mercedes, in my area," WAS HIS"

 

Although=20 they don't have aviation parts any more, they still stock a complete lin= e of=20 Tracy's seals, rebuild kits etc.

 

Rich

 

In a=20 message dated 4/10/2016 9:28:09 P.M. Pacific Daylight Time,=20 flyrotary@lancaironline.net writes:

Sorry=20 for lack of detailed info; I was away from home & pecking at my phon= e to=20 reply.

Wayback machine:
https://archive.org/web/

Tr= acy's=20 old website was:
http://www.rotaryaviation.com/=20
which no longer has aviation info on it (currently only car performa= nce=20 parts under different ownership).

 

=3D= --part1_69e05d.6b0e7d60.443d5722_boundary--