X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.122] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4245603 for flyrotary@lancaironline.net; Mon, 03 May 2010 09:18:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.122; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=cDoCBObb3cacPy303HW7MdnqOItAx7SMItS1sEIlEGs= c=1 sm=0 a=Er6hwA6a1l4K/FyzC6NN7w==:17 a=ayC55rCoAAAA:8 a=arxwEM4EAAAA:8 a=QdXCYpuVAAAA:8 a=7g1VtSJxAAAA:8 a=ekHE3smAAAAA:20 a=UretUmmEAAAA:8 a=Ia-xEzejAAAA:8 a=YWISOAoqAAAA:8 a=gRVMoM8JXDkCoqAL_RwA:9 a=pJ4S0xWN9Haa6p4YSGsA:7 a=9gTjpC5vABhv8Qs6GXZULZOXP3cA:4 a=CjuIK1q_8ugA:10 a=1vhyWl4Y8LcA:10 a=VvPTdWEW8HYA:10 a=EzXvWhQp4_cA:10 a=SSmOFEACAAAA:8 a=tZh0LaCSDKuUw-Wogm0A:7 a=-BNT0cWoX4fNyrCvX8qCNcg7GmYA:4 a=Er6hwA6a1l4K/FyzC6NN7w==:117 X-Cloudmark-Score: 0 X-Originating-IP: 75.181.123.159 Received: from [75.181.123.159] ([75.181.123.159:3785] helo=computername) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 53/06-16464-FECCEDB4; Mon, 03 May 2010 13:17:35 +0000 From: "Ed Anderson" Message-ID: <53.06.16464.FECCEDB4@cdptpa-omtalb.mail.rr.com> To: "'Rotary motors in aircraft'" Subject: Stand off -RE: [FlyRotary] ka-pow Date: Mon, 3 May 2010 09:17:37 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003E_01CAEAA1.790DEB30" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 In-reply-to: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Thread-Index: Acrqc9IRKntDCWmPQAeFNLV7Kd+9OgATmPiQ This is a multi-part message in MIME format. ------=_NextPart_000_003E_01CAEAA1.790DEB30 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Kevin, I'm sure you are aware that many carbureted intake systems can have a strong "stand off" wave that keeps a "mist/cloud" of fuel particles riding a standing wave in front of the carburetor intake. This may only occur at certain rpm - but is almost certain to happen at some (several?) RPM values. When you capture/confine that mist of fuel in a plenum/cleaner box - it can provide a ready source for Ka-Pow - only looking for an ignition source. Frequently if you take off the plenum box you can actually see the mist of fuel dancing in front of the intake. The source of ignition can be several - improper ignition timing is one, on the older 13Bs with the overlap between exhaust and intake parts of the combustion chamber, it was not unknown for a glowing carbon particle to touch off the intake mixture prematurely. Keep the fire extinguisher handy Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://www.dmack.net/mazda/index.html http://www.flyrotary.com/ http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.rotaryaviation.com/Rotorhead%20Truth.htm _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of kevin lane Sent: Sunday, May 02, 2010 11:50 PM To: Rotary motors in aircraft Subject: [FlyRotary] ka-pow my new engine has been hard to start. the other weekend I experienced a big bang [backfire I guessed]. today I noticed my intake manifold has a bit of a leak! my design assumption that it would always be in a slight vacuum state was obviously wrong. need to check the carb I guess to see if anything happened to it. KevinLane Carpentry www.KevinLaneCarpentry.com ------=_NextPart_000_003E_01CAEAA1.790DEB30 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Kevin,

 

I’m sure you are aware that = many carbureted intake systems can have a strong “stand off” wave that keeps = a “mist/cloud” of fuel particles riding a standing wave in front of the carburetor = intake.  This may only occur at certain rpm – but is almost certain to = happen at some (several?) RPM values.  When you capture/confine that mist of = fuel in a plenum/cleaner box – it can provide a ready source for Ka-Pow = – only looking for an ignition source.  Frequently if you take off = the plenum box you can actually see the mist of fuel dancing in front of the = intake. 

 

The source of ignition can be = several – improper ignition timing is one, on the older 13Bs with the overlap = between exhaust and intake parts of the combustion chamber, it was not unknown = for a glowing carbon particle to touch off the intake mixture = prematurely.

 

Keep the fire extinguisher = handy

 

Ed

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of kevin lane
Sent: Sunday, May 02, = 2010 11:50 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] = ka-pow

 

my new engine has been hard to start.  the other weekend I experienced a big bang = [backfire I guessed].  today I noticed my intake manifold has a bit of a = leak!  my design assumption that it would always be in a slight vacuum state = was obviously wrong.  need to check the carb I guess to see if anything happened to it.

 

 

KevinLane Carpentry
www.KevinLaneCarpentry.com=

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