Europa-List Digest Archive

Sun 07/05/09


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 05:43 AM - Shortening throttle cable (Robert Borger)
     2. 06:45 AM - Re: Fuel system - More Questions! (ofamerica.com YERLY)
 
 
 


Message 1


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    Time: 05:43:50 AM PST US
    From: Robert Borger <rlborger@mac.com>
    Subject: Shortening throttle cable
    Fellow Europaphiles, Spent yesterday (4th) morning under the Europa. I have replaced the stranded cable in my throttle with solid 0.065 stainless steel. I also replaced my home-made throttle box with a new TH01 from Europa while I was at it. It all seems to work well enough except that the solid cable has a lot of drag in those long cable runs. I am considering shortening the run from firewall to carbs to reduce the drag. My question for those of you who have done this is: How do you reconnect the cable housing to the threaded adjustment unit on the carb end after you have cut the cable housing to length? Second question: Is there a preferred length/route from the firewall to the carbs? I'll be posting pics of yesterday's work later today. Right now I have to go Northwest Regional to work on completion of a Little Toot we have been building for the last 4 months. Hope to have it (and my Europa) flying by the coming weekend. Check six, Bob Borger Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S http://www.europaowners.org/N914XL Aircraft Flying! 3705 Lynchburg Dr. Corinth, TX 76208 Home: 940-497-2123 Cel: 817-992-1117


    Message 2


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    Time: 06:45:07 AM PST US
    From: "ofamerica.com YERLY" <budyerly@msn.com>
    Subject: Re: Fuel system - More Questions!
    Rich, Call on the cell as I'm all over the place this week. My runup on Saturday was on Baker's 914 The FP was 4 psi solid until boost started to kick in. 4 PSI until passing 30 inches. Max continuous 100% throttle at 35 inches mp, airbox at about 2.5 psi boost fuel pressure 5.9 to 6.2 Full 115% throttle at 40 inched mp, airbox at about 4.8 psi boost, fuel pressure 9.8-10. At full it should have only gone to about 9 for the atmospheric pressure, but I read 10, and that's in limits. Setup was a boost gauge on the airbox, direct reading gauge on the fuel pressure nipple with the restrictor pressed into the end of the brass banjo. Sure wish I had it mounted better, what a vibrating nightmare until I wire tied the mess together. Look at the maintenance manual and you can see by all accounts you are reading just a little high. Pay attention to the chart on page 9.5.2 of the maintenance manual, and do the conversions for the airbox pressure, and fuel pressure. I'll be on the cell as I have UCF students doing their project and test flying this evening weather permitting. Bud ----- Original Message ----- From: TheSchultzFamily<mailto:Theschultzfamily@comcast.net> To: europa-list@matronics.com<mailto:europa-list@matronics.com> Sent: Friday, July 03, 2009 9:52 AM Subject: RE: Europa-List: Fuel system - More Questions! Bud, The reading was taken off the double banjo that feeds the passenger side carb. This as done when the engine seemed to be running correctly. Being at sea level and with about a 29.8pressure day I figured these did not sound too bad. I do have the original differential pressure sender. I will fire it up at work on Monday and see if it is reading correctly before installing it or ordering a new one. Aircraft spruce is very proud of that little sender now days. ------------------------------------------------------------------------- ----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of ofamerica.com YERLY Sent: Thursday, July 02, 2009 11:11 PM To: europa-list@matronics.com Subject: Re: Europa-List: Fuel system - More Questions! Rich, I'll run mine or Bakers tomorrow, weather permitting, and see what my fuel pressure does. If memory serves, I start at 4 psi at idle and at full throttle still see about 4 in line, and about 10.0 off the regulator (my sender reads a little low). My gut feel is that regulated fuel pressure is going up with manifold pressure as it should, but if line pressure is going up to the regulator, that does not pass the common sense test. On ground tests, the fuel pressure goes up as the resistance goes up. Example: When I set up a fuel system, I disconnect the feed and pressure gauge from the engine fuel regulator and pump fuel through the lines past a direct reading pressure gauge (Tee'd to the aircrafts sender) and through a valve to a gas can. This allows me to filter the system, verify flow rates (by timing) and by closing off the valve, I can verify the fuel pressure, the fuel flow decreases and the pressure goes up well above 7 psi as I check flows and verify pressure readings. Note: These readings are done before the regulator. 11.6 psi indicates a strong reduction in flow if reading prior to the regulator, however if you are reading from the regulator, the regulated pressure at full power 39.5 MP is about 5 psi boost, and 11.6 psi fuel pressure is a tad high. From Page 9.2.3 of the Rotax maintenance manual, Fuel pressure =Airbox pressure + 250hPa At takeoff performance the fuel pressure is going to be about 700hPa or around . 7bar or about 10.15 psi I'll talk to you after testing. The shop took a lightning strike and power surge, so I have only one shop phone left and it blew my shop computer, even with the surge protectors. Pretty spectacular really. Snap crackle pop all in one. I will be slow at answering emails for a few more days. Bud ----- Original Message ----- From: TheSchultzFamily<mailto:Theschultzfamily@comcast.net> To: europa-list@matronics.com<mailto:europa-list@matronics.com> Sent: Thursday, July 02, 2009 9:08 PM Subject: RE: Europa-List: Fuel system - More Questions! Can anyone verify these "non" differential fuel pressure readings? MP = 14.3 Fuel = 4.6 MP - 14 Fuel = 4.9 MP = 20 Fuel = 4.9 MP = 25 Fuel = 6.4 MP = 30 Fuel = 9.1 MP = 39.5 Fuel = 11.6 Engine seems to be running fine with these but earlier in the process the engine was once again surging. Everyone that hears the surging thinks I have a fuel problem???? Monitoring and testing continues... Rich Schultz N262AE href="http://www.matronics.com/Navigator?Europa-List">http://www.matron href="http://forums.matronics.com">http://forums.matronics.comhref="h ttp://www.matronics.com/contribution">http://www.matronics.com/c http://www.matronics.com/Navigator?Europa-Listhttp://forums.matronics.com http://www.matronics.com/contribution http://www.matronics.com/Navigator?Europa-List<http://www.matronics.com/N avigator?Europa-List> http://www.matronics.com/contribution<http://www.matronics.com/contributi on>




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