---------------------------------------------------------- Kitfox-List Digest Archive --- Total Messages Posted Tue 06/30/09: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:21 AM - Re: Re: Missing Rotax 912S - A concern? (Randy Daughenbaugh) 2. 10:10 AM - Re: Re: Missing Rotax 912S - A concern? (JC Propeller Design) 3. 10:22 AM - Re: Missing Rotax 912S - A concern? (Av8r3400) 4. 03:25 PM - spacer at rear of cockpit roof- info needed (Dave G) 5. 05:25 PM - Re: spacer at rear of cockpit roof- info needed (Lowell Fitt) 6. 06:05 PM - Re: spacer at rear of cockpit roof- info needed (Dave G) ________________________________ Message 1 _____________________________________ Time: 09:21:13 AM PST US From: "Randy Daughenbaugh" Subject: RE: Kitfox-List: Re: Missing Rotax 912S - A concern? Thanks John and Clint. I haven't changed prop pitch in nearly 3 years. I should have mentioned that I took the fuel line off where it was feeding the fuel pump and had a fuel flow of nearly 20 gpm or about 5 times my normal fuel consumption. I will try to drop the nose to see what happens. A related observation: At one point I flew for a bit with it missing and at full throttle. It runs, but with much reduced power. I should have noted the exhaust temperatures. I have a lot of visitors coming soon who want rides. I am not giving any rides until I get this sorted out. Randy 912S is there, but still missing! _____ From: owner-kitfox-list-server@matronics.com [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of KITFOXZ@aol.com Sent: Monday, June 29, 2009 3:00 PM Subject: Re: Kitfox-List: Re: Missing Rotax 912S - A concern? Hello Randy, I was doubting your loose spark plug connectors were the problem when I read it because to actually cause a repeatable miss on that cylinder, both connectors would have to be loose as a goose and arching enough to affect low or no spark at the same exact time on both plugs. I am not saying a loose connector is to be ignored at all, just that by itself, not likely to cause a constant miss-fire at a certain load and altitude. I don't yet think you have a fuel pump problem either. While a fuel pump problem of not delivering full volume and full pressure would manifest itself at high demand times, a mechanical diaphragm type fuel pump usually does not fail in that way. They usually leak through the diaphragm and failure is pretty bad and it won't deliver fuel at much of a pressure or volume and would be a constant problem at many power settings. I would like to see you de-pitch your prop a little and repeat your tests. (I wonder what RPM you are turning when the "miss" occurs) Also, I would like to hear that you have totally scrutinized your carb mounting boots to be sure they are not torn or leaking air in any way. You say the problem goes away when you throttle back a little. Try leaving the throttle put but lower the nose to decrease loading. Does that solve the miss? As for fuel, be sure every path is clear of dirt and If the above test of lower pitch on the prop doesn't solve it and your carb mounts are squared away, try en richening your carb needles one level. John In a message dated 6/29/2009 2:23:09 P.M. Eastern Daylight Time, rjdaugh@rapidnet.com writes: Yeah, I know I am a good straight man. The $55 spark plug caps didn't solve the missing problem. They are not loose now, but.... What is a good way to check the fuel pump? Remember it only does this at altitude and at full throttle. I am also considering that it may be a problem with winter blend gas. The change over date here is 1 May, and I may have had some winter gas in it. Randy _____ A Good Credit Score is 700 or Above. See p://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=Jun estepsfooterNO62> yours in just 2 easy steps! ________________________________ Message 2 _____________________________________ Time: 10:10:02 AM PST US From: "JC Propeller Design" Subject: Re: Kitfox-List: Re: Missing Rotax 912S - A concern? Have flown 2 airplane with valve sticking, both O-200 engines but diffrent aircraft, all of a sudden it loose power and start to shake, then it go away. Jan ----- Original Message ----- From: Randy Daughenbaugh To: kitfox-list@matronics.com Sent: Tuesday, June 30, 2009 6:17 PM Subject: RE: Kitfox-List: Re: Missing Rotax 912S - A concern? Thanks John and Clint. I haven't changed prop pitch in nearly 3 years. I should have mentioned that I took the fuel line off where it was feeding the fuel pump and had a fuel flow of nearly 20 gpm or about 5 times my normal fuel consumption. I will try to drop the nose to see what happens. A related observation: At one point I flew for a bit with it missing and at full throttle. It runs, but with much reduced power. I should have noted the exhaust temperatures. I have a lot of visitors coming soon who want rides. I am not giving any rides until I get this sorted out. Randy 912S is there, but still missing! ------------------------------------------------------------------------- ----- From: owner-kitfox-list-server@matronics.com [mailto:owner-kitfox-list-server@matronics.com] On Behalf Of KITFOXZ@aol.com Sent: Monday, June 29, 2009 3:00 PM To: kitfox-list@matronics.com Subject: Re: Kitfox-List: Re: Missing Rotax 912S - A concern? Hello Randy, I was doubting your loose spark plug connectors were the problem when I read it because to actually cause a repeatable miss on that cylinder, both connectors would have to be loose as a goose and arching enough to affect low or no spark at the same exact time on both plugs. I am not saying a loose connector is to be ignored at all, just that by itself, not likely to cause a constant miss-fire at a certain load and altitude. I don't yet think you have a fuel pump problem either. While a fuel pump problem of not delivering full volume and full pressure would manifest itself at high demand times, a mechanical diaphragm type fuel pump usually does not fail in that way. They usually leak through the diaphragm and failure is pretty bad and it won't deliver fuel at much of a pressure or volume and would be a constant problem at many power settings. I would like to see you de-pitch your prop a little and repeat your tests. (I wonder what RPM you are turning when the "miss" occurs) Also, I would like to hear that you have totally scrutinized your carb mounting boots to be sure they are not torn or leaking air in any way. You say the problem goes away when you throttle back a little. Try leaving the throttle put but lower the nose to decrease loading. Does that solve the miss? As for fuel, be sure every path is clear of dirt and If the above test of lower pitch on the prop doesn't solve it and your carb mounts are squared away, try en richening your carb needles one level. John In a message dated 6/29/2009 2:23:09 P.M. Eastern Daylight Time, rjdaugh@rapidnet.com writes: Yeah, I know I am a good straight man. The $55 spark plug caps didn't solve the missing problem. They are not loose now, but.... What is a good way to check the fuel pump? Remember it only does this at altitude and at full throttle. I am also considering that it may be a problem with winter blend gas. The change over date here is 1 May, and I may have had some winter gas in it. Randy ------------------------------------------------------------------------- ----- A Good Credit Score is 700 or Above. See yours in just 2 easy steps! - The Kitfox-List Email Forum ---> http://www.matronics.com/Navigator?Kitfox-List - MATRONICS WEB FORUMS - - List Contribution Web Site - -Matt Dralle, List Admin. __________ Information from ESET NOD32 Antivirus, version of virus signature database 4198 (20090629) __________ The message was checked by ESET NOD32 Antivirus. ________________________________ Message 3 _____________________________________ Time: 10:22:42 AM PST US Subject: Kitfox-List: Re: Missing Rotax 912S - A concern? From: "Av8r3400" I'm a nooby so I know very little, but one thing that was pointed out to me on my 912UL is the braided lines coming from the flywheel (pickup coils) to the CDI boxes. If they are tight, they can pull loose from one or both ends only under high torque load (high power) when the rubber mounts flex. Maybe something else to look at? -------- Thanks, Av8r3400 Kitfox Model IV-1200 912UL IVO-IFA Grove Gear Read this topic online here: http://forums.matronics.com/viewtopic.php?p=250790#250790 ________________________________ Message 4 _____________________________________ Time: 03:25:59 PM PST US From: "Dave G" Subject: Kitfox-List: spacer at rear of cockpit roof- info needed Due to the unusual configuration of my rear window I must place a wide strip of aluminum over the rear of the cockpit roof which extends over the one piece rear window plastic. I may not wish to keep the arrangement and I want to make provision for returning to the folding window. (if anyone has a folding window for sale now would be a good time to speak up). In order to do that I must replace the spacer that goes between the roof and the support, but I do not know how thick it is or the original material. My original Denney manual gives no specs for many pieces, just part numbers. ________________________________ Message 5 _____________________________________ Time: 05:25:39 PM PST US From: "Lowell Fitt" Subject: Re: Kitfox-List: spacer at rear of cockpit roof- info needed Dave, You caught me at the perfect moment. I am in the process of straightening up my hangar for a 4th of July breakfast here. Along with that project is an attempt to sort through the parts for my new (1992) Model IV kit. The part you are wondering about is .025 thick. The turtle deck is .020. The piece I have is cut a bit shy of half inch. If you can't find such a piece locally, I have a bit of scrap and should be able to send what you need for postage. Lowell ----- Original Message ----- From: "Dave G" Sent: Tuesday, June 30, 2009 3:24 PM Subject: Kitfox-List: spacer at rear of cockpit roof- info needed Due to the unusual configuration of my rear window I must place a wide strip of aluminum over the rear of the cockpit roof which extends over the one piece rear window plastic. I may not wish to keep the arrangement and I want to make provision for returning to the folding window. (if anyone has a folding window for sale now would be a good time to speak up). In order to do that I must replace the spacer that goes between the roof and the support, but I do not know how thick it is or the original material. My original Denney manual gives no specs for many pieces, just part numbers. ________________________________ Message 6 _____________________________________ Time: 06:05:13 PM PST US From: "Dave G" Subject: Re: Kitfox-List: spacer at rear of cockpit roof- info needed Thanks Lowell, I can come up with enough .025 to make it. The top piece I'm using is just soft aluminum and weighs 5 oz. on top of the very heavy window, not ideal and I expect to remove it later on. ----- Original Message ----- From: "Lowell Fitt" Sent: Tuesday, June 30, 2009 9:23 PM Subject: Re: Kitfox-List: spacer at rear of cockpit roof- info needed > > Dave, > > You caught me at the perfect moment. I am in the process of straightening > up my hangar for a 4th of July breakfast here. Along with that project is > an attempt to sort through the parts for my new (1992) Model IV kit. The > part you are wondering about is .025 thick. The turtle deck is .020. The > piece I have is cut a bit shy of half inch. If you can't find such a piece > locally, I have a bit of scrap and should be able to send what you need > for postage. > > Lowell > > ----- Original Message ----- > From: "Dave G" > To: > Sent: Tuesday, June 30, 2009 3:24 PM > Subject: Kitfox-List: spacer at rear of cockpit roof- info needed > > > Due to the unusual configuration of my rear window I must place a wide > strip of aluminum over the rear of the cockpit roof which extends over the > one piece rear window plastic. I may not wish to keep the arrangement and > I want to make provision for returning to the folding window. (if anyone > has a folding window for sale now would be a good time to speak up). > > In order to do that I must replace the spacer that goes between the roof > and the support, but I do not know how thick it is or the original > material. My original Denney manual gives no specs for many pieces, just > part numbers. > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kitfox-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kitfox-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kitfox-list Browse Digests http://www.matronics.com/digest/kitfox-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.