Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 340415 for flyrotary@lancaironline.net; Sat, 31 Jul 2004 01:11:45 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.38; envelope-from=daveleonard@cox.net Received: from davidandanne ([68.111.224.107]) by fed1rmmtao01.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with SMTP id <20040731051115.NHOR20016.fed1rmmtao01.cox.net@davidandanne> for ; Sat, 31 Jul 2004 01:11:15 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Turbo and the EC2 Date: Fri, 30 Jul 2004 22:11:17 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0022_01C47682.22A12A30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0022_01C47682.22A12A30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageThat's great data to have Rusty, thanks for the contribution. Now I just need to figure out a way to make it useful. Dave Leonard -----Original Message----- It could be that with faster combustion wave propagation that you would want the timing of the lead and trail closer in timing rather than further or possibly vice versa {:>). . Ed Anderson Exactly right Ed, or vice versa :-) Through the miracle of copy and paste, I'll attach the timing split from my old FD engine computer. Keep in mind that this is NOT the stock Mazda timing, though it's probably close to it. The top row is the scale in RPM, and the first column is the scale in inches of mercury. The numbers in the box represent the difference in degrees between when the leading, and trailing ignition will fire. Positive numbers indicate that the leading fires before the trailing. It's interesting to note that aside from the idle range, the timing split is 0 until you get to around sea level pressure. From there, it quickly increases to about a maximum level for the rest of the boost range. From this, I would assume that increasing the split reduces the chance of detonation. Still hard to say how important this is for us. How much greater is the chance of detonation? How much power would you lose if you had to run on trailing ignition only with the split built in? Cheers, Rusty (doing my turbo duties, though I'm not sure why) ------=_NextPart_000_0022_01C47682.22A12A30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
That's=20 great data to have Rusty, thanks for the = contribution.
 
Now I=20 just need to figure out a way to make it useful.
 
Dave=20 Leonard
-----Original Message-----

It could be that   with = faster=20 combustion wave propagation that you would want the timing of the lead = and=20 trail closer in timing rather than further or possibly vice versa=20 {:>). 
. 
Ed Anderson
 
Exactly=20 right Ed, or vice versa  :-)
 
Through the=20 miracle of copy and paste, I'll attach the timing split from my old FD = engine=20 computer.  Keep in mind that this is NOT the stock Mazda timing, = though=20 it's probably close to it.  The top row is the scale in RPM, and = the=20 first column is the scale in inches of mercury.  =  The numbers in the box represent the = difference in=20 degrees between when the leading, and trailing ignition will = fire. =20 Positive numbers indicate that the leading fires before the = trailing. =20
 
It's=20 interesting to note that aside from the idle range, the timing split = is 0=20 until you get to around sea level pressure.  From there, it = quickly=20 increases to about a maximum level for the rest of the boost = range.  From=20 this, I would assume that increasing the split reduces the chance of=20 detonation.  
 
Still hard=20 to say how important this is for us.  How much greater is the = chance of=20 detonation?  How much power would you lose if you had to run = on=20 trailing ignition only with the split built=20 in?  
 
Cheers,
Rusty=20 (doing my turbo duties, though I'm not sure=20 why) 
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