Return-Path: Received: from [206.228.212.23] (HELO mail.statesville.net) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 91911 for flyrotary@lancaironline.net; Wed, 26 May 2004 21:23:35 -0400 Received: from TWJames [63.162.171.178] by mail.statesville.net (SMTPD32-8.11) id A3F48CED010C; Wed, 26 May 2004 21:27:16 -0400 From: "Tommy James" To: "Rotary motors in aircraft" Subject: TWM FAQ Date: Wed, 26 May 2004 21:23:41 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C44367.B7D8AEA0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal In-Reply-To: X-RBL-Warning: REVDNS: This E-mail was sent from a MUA/MTA 63.162.171.178 with no reverse DNS entry. X-Declude-Sender: twjames@statesville.net [63.162.171.178] X-Note: Scanned for Spam This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C44367.B7D8AEA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit MessageHi Guys, I saw this note and thought it would be of interest to our induction efforts. Regards! Tommy James<>< Why are the injectors positioned in the TWM throttle bodies and not in the manifolds, like original equipment EFI systems? Original equipment EFI systems are configured to meet very stringent emission regulations and to provide "soft" driveability characteristics. Positioning the injector as close to the inlet valve is beneficial in this respect. Maximum power however, is usually obtained by moving the injector away from the inlet valve, some racing engine manufacturers going as far as to mount the injector high in the velocity stack and others installing two injectors, designed to operate at different RPM. When TWM designed the throttle bodies our engineers were not in favor of having high pressure fuel on the atmosphere side of the throttle plate, although this could have resulted in some power increase. We compromised by mounting the injector as far from the cylinder head as possible while still maintaining the safety afforded by keeping the fuel downstream of the butterfly. ------=_NextPart_000_0014_01C44367.B7D8AEA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

Hi Guys,  I saw this note = and thought=20 it would be of interest to our induction efforts.

Regards! Tommy=20 James<><

 

Why are the injectors positioned in the TWM throttle bodies and = not in=20 the manifolds, like original equipment EFI systems?

Original = equipment=20 EFI systems are configured to meet very stringent emission regulations = and to=20 provide "soft" driveability characteristics. Positioning the injector as = close=20 to the inlet valve is beneficial in this respect. Maximum power however, = is=20 usually obtained by moving the injector away from the inlet valve, some = racing=20 engine manufacturers going as far as to mount the injector high in the = velocity=20 stack and others installing two injectors, designed to operate at = different RPM.=20 When TWM designed the throttle bodies our engineers were not in favor of = having=20 high pressure fuel on the atmosphere side of the throttle plate, = although this=20 could have resulted in some power increase. We compromised by mounting = the=20 injector as far from the cylinder head as possible while still = maintaining the=20 safety afforded by keeping the fuel downstream of the butterfly. =
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