---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Sat 08/21/10: 16 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:05 AM - TMXIO-540 and GAMI injectors (Alan Mekler) 2. 09:58 AM - Fuel Flow Transducer Relocation (Robin Marks) 3. 11:50 AM - Re: TMXIO-540 and GAMI injectors (John Cox) 4. 12:40 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen) 5. 12:42 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen) 6. 02:24 PM - Re: TMXIO-540 and GAMI injectors (Patrick Thyssen) 7. 03:26 PM - Re: TMXIO-540 and GAMI injectors (Bob Turner) 8. 03:38 PM - Egt probes (GRT) (DLM) 9. 04:00 PM - Re: TMXIO-540 and GAMI injectors (Alan Mekler) 10. 05:08 PM - Re: Egt probes (GRT) (Kelly McMullen) 11. 05:33 PM - Re: TMXIO-540 and GAMI injectors (Kelly McMullen) 12. 05:47 PM - Re: TMXIO-540 and GAMI injectors (Alan Mekler) 13. 06:51 PM - Re: Fuel Flow Transducer Relocation (Phillip Perry) 14. 09:12 PM - Re: Fuel Flow Transducer Relocation (Robin Marks) 15. 09:32 PM - Re: Fuel Flow Transducer Relocation (Dave Saylor) 16. 11:38 PM - Miniumum fuel comfort zone (AirMike) ________________________________ Message 1 _____________________________________ Time: 09:05:16 AM PST US From: "Alan Mekler" Subject: RV10-List: TMXIO-540 and GAMI injectors I have been trying the GAMI injectors( on the 4th set now) but found the fuel flow on the cylinders varies widely. My cylinder #5 has the richest injector and it still peaks a gallon or more before the other cylinders Before gamis it was 2.5 gallons.. Has any one had this problem? Any solutions? GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours on the engine and all compressions are good. No intake leaks. Alan N668G ________________________________ Message 2 _____________________________________ Time: 09:58:54 AM PST US From: Robin Marks Subject: RV10-List: Fuel Flow Transducer Relocation Since new my Fuel Flow readings varied widely during flight with the transducer living in the recommended and what should be it=92s ideal locati on in the tunnel we decided to take action. I would experience well over 1 GPH swings in the readings with a lot of bouncing in the FF Rate. When I turned on the boost pump I would get reading up to 2.5 GPH more than actual fuel burn. This made injector tuning nearly impossible even when reviewing EFIS data. The erratic and inaccurate FF figures aversively effected my EFIS fue l totalize always indicating more fuel burned than was actually the case. The fuel pressure readings tended to bounce around too causing low fuel pressur e warnings especially on climb out. As others have suggested & done in the past we took the drastic step of relocating the FF Transducer from the tunnel to forward of the injector throttle body between the throttle body and the spider. This modification while time consuming did correct the fuel flow issue both in standard fligh t and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs. wild swings of well over 1 GPH. Robin ________________________________ Message 3 _____________________________________ Time: 11:50:15 AM PST US Subject: RE: RV10-List: TMXIO-540 and GAMI injectors From: John Cox My experience with the GAMI's are a limited range of corrective sizes. As a graduate of Airflow Performance's school in South Carolina, I have a paro chial bias as to their techniques and the diverse range of injector ports f or the Lycoming 540 product line. It goes as afar as believing they are ev en superior to Brand A used by that fine Canadian rebuilder of such deep re spect with this group. I feel GAMI is an excellent choice for aircraft with Continental propulsion products. Beech, Cirrus, and Oh forbid - Lancair International (plastic p lanes). I will get off the soapbox cause I use, repair and maintain Lycomings in RV s and on the M-14Ps with single point fuel bodies. Bendix/Precision is fin e for its purpose. Oh yeh, Fuel Injection for the Rotax found in RV-12s too. Did the Rotax tr aining in Canada. John Cox From: Alan Mekler Sent: Sat 8/21/2010 9:04 AM Subject: RV10-List: TMXIO-540 and GAMI injectors I have been trying the GAMI injectors( on the 4th set now) but found the f uel flow on the cylinders varies widely. My cylinder #5 has the richest in jector and it still peaks a gallon or more before the other cylinders Befor e gamis it was 2.5 gallons.. Has any one had this problem? Any solutions? GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours on the engine and all compressions are good. No intake leaks. Alan N668G ________________________________ Message 4 _____________________________________ Time: 12:40:21 PM PST US Subject: Re: RV10-List: TMXIO-540 and GAMI injectors From: Kelly McMullen Most likely cause is the location of your fuel flow sending unit, as Robin just noted. Fuel flow that peaks 1 gph different between cylinders would not run worth a damn. I am assuming that is not the case because you didn't mention any issues with how the engine ran. So I seriously question the validity of your fuel flow data. Lycomings generally are within 0.6 gph with stock injectors. But GAMI cannot correct for inaccurate FF readings relative to peak egts. On Sat, Aug 21, 2010 at 9:04 AM, Alan Mekler wrote: > I have been trying the GAMI injectors( on the 4th set now) but found the > fuel flow on the cylinders varies widely. My cylinder #5 has the richest > injector and it still peaks a gallon or more before the other cylinders > Before gamis it was 2.5 gallons.. Has any one had this problem? Any > solutions? > > GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours > on the engine and all compressions are good. No intake leaks. > > Alan > > N668G > > ________________________________ Message 5 _____________________________________ Time: 12:42:11 PM PST US Subject: Re: RV10-List: TMXIO-540 and GAMI injectors From: Kelly McMullen One other possible cause is ignition, IF you have the stock Slick magnetos. Slick magnetos generally work okay, but some have wildly inaccurate firing between cylinders. I know of one turbocharged TIO-540 that was balanced perfectly and ran fine LOP until one of the mags was overhauled. After that it simply would not run LOP, was too rough. On Sat, Aug 21, 2010 at 12:39 PM, Kelly McMullen wrote: > Most likely cause is the location of your fuel flow sending unit, as > Robin just noted. Fuel flow that peaks 1 gph different between > cylinders would not run worth a damn. I am assuming that is not the > case because you didn't mention any issues with how the engine ran. > So I seriously question the validity of your fuel flow data. Lycomings > generally are within 0.6 gph with stock injectors. But GAMI cannot > correct for inaccurate FF readings relative to peak egts. > > On Sat, Aug 21, 2010 at 9:04 AM, Alan Mekler wrote: >> I have been trying the GAMI injectors( on the 4th set now) but found the >> fuel flow on the cylinders varies widely. My cylinder #5 has the richest >> injector and it still peaks a gallon or more before the other cylinders >> Before gamis it was 2.5 gallons.. Has any one had this problem? Any >> solutions? >> >> GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours >> on the engine and all compressions are good. No intake leaks. >> >> Alan >> >> N668G >> >> >> > ________________________________ Message 6 _____________________________________ Time: 02:24:38 PM PST US From: Patrick Thyssen Subject: Re: RV10-List: TMXIO-540 and GAMI injectors ? Have you done the coke bottle check? Has anyone messed with the lines fro m the spider to injectors? Are we sure the lines are the right ones? The ot her thing have you had any problems with your EGT system. Could your EGT pr obes be bad? Peaking or not peaking where they should? Just a few thoughts Patrick Thyssen --- On Sat, 8/21/10, Alan Mekler wrote: From: Alan Mekler Subject: RV10-List: TMXIO-540 and GAMI injectors =0A=0A=0A =0A =0A=0A=0A=0A=0A=0A=0AI have been trying the GAMI injectors( o n the 4th=0Aset now)- but found the fuel flow on -the cylinders varies widely. My cylinder=0A#5 has the richest injector and it still peaks a gall on or more before the=0Aother cylinders Before gamis it was 2.5 gallons.. H as any one had this problem?=0AAny solutions? =0A=0AGAMI does not why the f uel is so unbalanced in this engine.=0AI have 95 hours on the engine and al l compressions are good. No intake leaks. =0A=0AAlan =0A=0AN668G =0A=0A=0A =0A=0A=0A=0A=0A=0A ________________________________ Message 7 _____________________________________ Time: 03:26:28 PM PST US Subject: RV10-List: Re: TMXIO-540 and GAMI injectors From: "Bob Turner" I second the last post. Do easy things first. Do the "coke bottle test" to be sure the "richest injector" cylinder really does get more gas than the others. -------- Bob Turner RV-10 QB Read this topic online here: http://forums.matronics.com/viewtopic.php?p=309674#309674 ________________________________ Message 8 _____________________________________ Time: 03:38:44 PM PST US From: "DLM" Subject: RV10-List: Egt probes (GRT) Another probe failed this morning. That makes 5 failures in 310 hours TTSN. This cylinder has not failed earlier so it was probably the lower quality probe. I will swap it out next week with an Electronics International to determine whether they are a better solution. They claim that the probe will last 2000 hours. My EGTS are operated usually between 1200-1420 F. For brief moments during leaning, some may range from 1420-1450 but are immediately brought under 1420 with mixture control. My usual cruise provides EGT range from 1375-1420. Yet probes have failed five times: cylinders 1(once), 2(twice), 6 (once) and now 3. Four failures occurred between 200-300 hours TTSN. I am installing an EI P-110; I had EI engine instrumentation for my Glastar and in 530 hours had no failures of either EGT or CHT probes. ________________________________ Message 9 _____________________________________ Time: 04:00:12 PM PST US From: "Alan Mekler" Subject: RE: RV10-List: TMXIO-540 and GAMI injectors Patrick, Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l than my richest cylinder #3. After changing to GAMIs (my 3rd set) I'm down to a 1 gallon spread. GAMI has given me the richest injector they make for cylinder # 5 but it still peaks early. Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm. Alan 13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow gal/hr 1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1 1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2 1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3 1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4 1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5 1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6 other method cylinder #1 1472 peak @ 11.5 cylinder #2 1451 peak@ 11.2 cylinder #3 1472 peak @ 11.1 cylinder#4 1477 peak @ 11.2 cylinder #5 1473 peak @ 12.1 cylinder #6 1474 peak @ 11.5 _____ From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Patrick Thyssen Sent: Saturday, August 21, 2010 5:22 PM Subject: Re: RV10-List: TMXIO-540 and GAMI injectors ? Have you done the coke bottle check? Has anyone messed with the lines from the spider to injectors? Are we sure the lines are the right ones? The other thing have you had any problems with your EGT system. Could your EGT probes be bad? Peaking or not peaking where they should? Just a few thoughts Patrick Thyssen --- On Sat, 8/21/10, Alan Mekler wrote: From: Alan Mekler Subject: RV10-List: TMXIO-540 and GAMI injectors I have been trying the GAMI injectors( on the 4th set now) but found the fuel flow on the cylinders varies widely. My cylinder #5 has the richest injector and it still peaks a gallon or more before the other cylinders Before gamis it was 2.5 gallons.. Has any one had this problem? Any solutions? GAMI does not why the fuel is so unbalanced in this engine. I have 95 hours on the engine and all compressions are good. No intake leaks. Alan N668G ________________________________ Message 10 ____________________________________ Time: 05:08:05 PM PST US From: Kelly McMullen Subject: Re: RV10-List: Egt probes (GRT) I don't recall the exact hours in service, but have had no failures on the fast response EI EGT probes on my 200hp Mooney running cruise EGTs in the 1350-1500 range, mounted exactly 1.5" from the cylinder flange of exhaust stack. Installed them several years ago. Only failures have been a couple leads/connections from the probes, easily fixed with new connector and crimper. On 8/21/2010 3:34 PM, DLM wrote: > Another probe failed this morning. That makes 5 failures in 310 hours > TTSN. This cylinder has not failed earlier so it was probably the > lower quality probe. I will swap it out next week with an Electronics > International to determine whether they are a better solution. They > claim that the probe will last 2000 hours. My EGTS are operated > usually between 1200-1420 F. For brief moments during leaning, some > may range from 1420-1450 but are immediately brought under 1420 with > mixture control. My usual cruise provides EGT range from 1375-1420. > Yet probes have failed five times: cylinders 1(once), 2(twice), 6 > (once) and now 3. Four failures occurred between 200-300 hours TTSN. I > am installing an EI P-110; I had EI engine instrumentation for my > Glastar and in 530 hours had no failures of either EGT or CHT probes. > * > > > * ________________________________ Message 11 ____________________________________ Time: 05:33:17 PM PST US From: Kelly McMullen Subject: Re: RV10-List: TMXIO-540 and GAMI injectors Perhaps you are working on the wrong end of the problem. #3&4 are peaking last, so must be too rich. The rest of the cylinders are peaking within 0.4gph of #5. You also will need to gather measurements every 0.2 gph to better detect the peaks once you get those two cylinders closer to the rest. On 8/21/2010 3:59 PM, Alan Mekler wrote: > > Patrick, > > Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l > than my richest cylinder #3. After changing to GAMIs (my 3^rd set) Im > down to a 1 gallon spread. GAMI has given me the richest injector they > make for cylinder # 5 but it still peaks early. > > Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm. > > Alan > > 13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow gal/hr > > 1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1 > > 1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2 > > 1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3 > > 1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4 > > 1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5 > > 1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6 > > other method > > cylinder #1 1472 peak @ 11.5 > > cylinder #2 1451 peak@ 11.2 > > cylinder #3 1472 peak @ 11.1 > > cylinder#4 1477 peak @ 11.2 > > cylinder #5 1473 peak @ 12.1 > > cylinder #6 1474 peak @ 11.5 > > ------------------------------------------------------------------------ > > *From:* owner-rv10-list-server@matronics.com > [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Patrick > Thyssen > *Sent:* Saturday, August 21, 2010 5:22 PM > *To:* rv10-list@matronics.com > *Subject:* Re: RV10-List: TMXIO-540 and GAMI injectors > > ? Have you done the coke bottle check? Has anyone messed with the > lines from the spider to injectors? Are we sure the lines are the > right ones? The other thing have you had any problems with your EGT > system. Could your EGT probes be bad? > Peaking or not peaking where they should? > Just a few thoughts > Patrick Thyssen > > --- On *Sat, 8/21/10, Alan Mekler //* wrote: > > > From: Alan Mekler > Subject: RV10-List: TMXIO-540 and GAMI injectors > To: rv10-list@matronics.com > Date: Saturday, August 21, 2010, 11:04 AM > > I have been trying the GAMI injectors( on the 4^th set now) but found > the fuel flow on the cylinders varies widely. My cylinder #5 has the > richest injector and it still peaks a gallon or more before the other > cylinders Before gamis it was 2.5 gallons.. Has any one had this > problem? Any solutions? > > GAMI does not why the fuel is so unbalanced in this engine. I have 95 > hours on the engine and all compressions are good. No intake leaks. > > Alan > > N668G > > > > * * > * * > ** > ** > ** > *http://www.matronics.com/Navigator?RV10-List* > ** > ** > *http://forums.matronics.com* > ** > ** > *http://www.matronics.com/contribution* > * * > * > > > * ________________________________ Message 12 ____________________________________ Time: 05:47:42 PM PST US From: "Alan Mekler" Subject: RE: RV10-List: TMXIO-540 and GAMI injectors Patrick, I agree. I'll be talking to GAMI on Monday. Alan -----Original Message----- From: owner-rv10-list-server@matronics.com [mailto:owner-rv10-list-server@matronics.com] On Behalf Of Kelly McMullen Sent: Saturday, August 21, 2010 8:13 PM Subject: Re: RV10-List: TMXIO-540 and GAMI injectors Perhaps you are working on the wrong end of the problem. #3&4 are peaking last, so must be too rich. The rest of the cylinders are peaking within 0.4gph of #5. You also will need to gather measurements every 0.2 gph to better detect the peaks once you get those two cylinders closer to the rest. On 8/21/2010 3:59 PM, Alan Mekler wrote: > > Patrick, > > Before switching to the GAMIs my cylinder #5 peaked at 2.5 gallons l > than my richest cylinder #3. After changing to GAMIs (my 3^rd set) I'm > down to a 1 gallon spread. GAMI has given me the richest injector they > make for cylinder # 5 but it still peaks early. > > Here is my latest flight data flying at 7000 MSL 22 inches/ 2400 rpm. > > Alan > > 13 12.5 12.1 11.7 11.3 11.0 10.5 10.3 Fuel flow gal/hr > > 1420 1438 1468 1474 1453 1438 1422 1403 cylinder #1 > > 1381 1398 1428 1452 1447 1437 1412 1373 cylinder #2 > > 1393 1409 1438 1456 1473 1468 1448 1414 cylinder #3 > > 1400 1417 1449 1468 1477 1470 1450 1414 cylinder #4 > > 1434 1467 1469 1443 1415 1411 1400 1435 cylinder # 5 > > 1410 1430 1463 1474 1458 1441 1420 1397 cylinder #6 > > other method > > cylinder #1 1472 peak @ 11.5 > > cylinder #2 1451 peak@ 11.2 > > cylinder #3 1472 peak @ 11.1 > > cylinder#4 1477 peak @ 11.2 > > cylinder #5 1473 peak @ 12.1 > > cylinder #6 1474 peak @ 11.5 > > ------------------------------------------------------------------------ > > *From:* owner-rv10-list-server@matronics.com > [mailto:owner-rv10-list-server@matronics.com] *On Behalf Of *Patrick > Thyssen > *Sent:* Saturday, August 21, 2010 5:22 PM > *To:* rv10-list@matronics.com > *Subject:* Re: RV10-List: TMXIO-540 and GAMI injectors > > ? Have you done the coke bottle check? Has anyone messed with the > lines from the spider to injectors? Are we sure the lines are the > right ones? The other thing have you had any problems with your EGT > system. Could your EGT probes be bad? > Peaking or not peaking where they should? > Just a few thoughts > Patrick Thyssen > > --- On *Sat, 8/21/10, Alan Mekler //* wrote: > > > From: Alan Mekler > Subject: RV10-List: TMXIO-540 and GAMI injectors > To: rv10-list@matronics.com > Date: Saturday, August 21, 2010, 11:04 AM > > I have been trying the GAMI injectors( on the 4^th set now) but found > the fuel flow on the cylinders varies widely. My cylinder #5 has the > richest injector and it still peaks a gallon or more before the other > cylinders Before gamis it was 2.5 gallons.. Has any one had this > problem? Any solutions? > > GAMI does not why the fuel is so unbalanced in this engine. I have 95 > hours on the engine and all compressions are good. No intake leaks. > > Alan > > N668G > > > > * * > * * > ** > ** > ** > *http://www.matronics.com/Navigator?RV10-List* > ** > ** > *http://forums.matronics.com* > ** > ** > *http://www.matronics.com/contribution* > * * > * > > > * ________________________________ Message 13 ____________________________________ Time: 06:51:34 PM PST US Subject: Re: RV10-List: Fuel Flow Transducer Relocation From: Phillip Perry Robin, I'm curious to know which brand of boost pump do you have? I'm also curious to know if anyone else is seeing this problem using the Andair boost pump with the FF transducer in Van's stock position. Thanks, Phil On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks wrote : > Since new my Fuel Flow readings varied widely during flight with the > transducer living in the recommended and what should be it=92s ideal loca tion > in the tunnel we decided to take action. I would experience well over 1 G PH > swings in the readings with a lot of bouncing in the FF Rate. When I turn ed > on the boost pump I would get reading up to 2.5 GPH more than actual fuel > burn. This made injector tuning nearly impossible even when reviewing EFI S > data. The erratic and inaccurate FF figures aversively effected my EFIS f uel > totalize always indicating more fuel burned than was actually the case. T he > fuel pressure readings tended to bounce around too causing low fuel press ure > warnings especially on climb out. > > As others have suggested & done in the past we took the drastic step of > relocating the FF Transducer from the tunnel to forward of the injector > throttle body between the throttle body and the spider. This modification > while time consuming did correct the fuel flow issue both in standard fli ght > and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs .. > wild swings of well over 1 GPH. > > > Robin > > * > =========== =========== =========== =========== > * > > ________________________________ Message 14 ____________________________________ Time: 09:12:49 PM PST US From: Robin Marks Subject: RE: RV10-List: Fuel Flow Transducer Relocation Andair boost for me. Fuel flow is a grey metal unit. I think most people have a red cube? Or am I confusing that with a fuel pressure device. BTW I didn=92t go into too much detail because we changed a bunch of things this time around. New fuel lines, replaced some tubing, removed the Andair gascolator from the system. Robin Do Not Archive *From:* owner-rv10-list-server@matronics.com [mailto: owner-rv10-list-server@matronics.com] *On Behalf Of *Phillip Perry *Sent:* Saturday, August 21, 2010 6:50 PM *To:* rv10-list@matronics.com *Subject:* Re: RV10-List: Fuel Flow Transducer Relocation Robin, I'm curious to know which brand of boost pump do you have? I'm also curious to know if anyone else is seeing this problem using the Andair boost pump with the FF transducer in Van's stock position. Thanks, Phil On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks wrote: Since new my Fuel Flow readings varied widely during flight with the transducer living in the recommended and what should be it=92s ideal locati on in the tunnel we decided to take action. I would experience well over 1 GPH swings in the readings with a lot of bouncing in the FF Rate. When I turned on the boost pump I would get reading up to 2.5 GPH more than actual fuel burn. This made injector tuning nearly impossible even when reviewing EFIS data. The erratic and inaccurate FF figures aversively effected my EFIS fue l totalize always indicating more fuel burned than was actually the case. The fuel pressure readings tended to bounce around too causing low fuel pressur e warnings especially on climb out. As others have suggested & done in the past we took the drastic step of relocating the FF Transducer from the tunnel to forward of the injector throttle body between the throttle body and the spider. This modification while time consuming did correct the fuel flow issue both in standard fligh t and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs. wild swings of well over 1 GPH. Robin * * * * *get="_blank">http://www.matronics.com/Navigator?RV10-List* *tp://forums.matronics.com* *_blank">http://www.matronics.com/contribution* * * * * * * ===========* ===========* ===========* ===========* * * ________________________________ Message 15 ____________________________________ Time: 09:32:44 PM PST US From: Dave Saylor Subject: Re: RV10-List: Fuel Flow Transducer Relocation The two most common flow transducers are EI's red cube and FloScan's grey metal unit. We moved our red cube some time ago and the difference was just like Robin saw. We have the stock pump. My understanding is that pulses from the fue l pump confuse the transducer. Whatever the cause it seems to be pretty universal. Dave Saylor AirCrafters 140 Aviation Way Watsonville, CA 95076 831-722-9141 Shop 831-750-0284 Cell On Sat, Aug 21, 2010 at 9:10 PM, Robin Marks wrote: > Andair boost for me. Fuel flow is a grey metal unit. I think most people > have a red cube? Or am I confusing that with a fuel pressure device. > > > BTW I didn=99t go into too much detail because we changed a bunch o f things > this time around. New fuel lines, replaced some tubing, removed the Andai r > gascolator from the system. > > > Robin > > Do Not Archive > > > *From:* owner-rv10-list-server@matronics.com [mailto: > owner-rv10-list-server@matronics.com] *On Behalf Of *Phillip Perry > *Sent:* Saturday, August 21, 2010 6:50 PM > *To:* rv10-list@matronics.com > *Subject:* Re: RV10-List: Fuel Flow Transducer Relocation > > > Robin, > > I'm curious to know which brand of boost pump do you have? > > I'm also curious to know if anyone else is seeing this problem using the > Andair boost pump with the FF transducer in Van's stock position. > > Thanks, > Phil > > > On Sat, Aug 21, 2010 at 11:56 AM, Robin Marks > wrote: > > Since new my Fuel Flow readings varied widely during flight with the > transducer living in the recommended and what should be it=99s idea l location > in the tunnel we decided to take action. I would experience well over 1 G PH > swings in the readings with a lot of bouncing in the FF Rate. When I turn ed > on the boost pump I would get reading up to 2.5 GPH more than actual fuel > burn. This made injector tuning nearly impossible even when reviewing EFI S > data. The erratic and inaccurate FF figures aversively effected my EFIS f uel > totalize always indicating more fuel burned than was actually the case. T he > fuel pressure readings tended to bounce around too causing low fuel press ure > warnings especially on climb out. > > As others have suggested & done in the past we took the drastic step of > relocating the FF Transducer from the tunnel to forward of the injector > throttle body between the throttle body and the spider. This modification > while time consuming did correct the fuel flow issue both in standard fli ght > and with the boost pump on. My readings now generally vary +/- 0.1 GPH vs .. > wild swings of well over 1 GPH. > > > Robin > > * * > > * * > > *get="_blank">http://www.matronics.com/Navigator?RV10-List* > > *tp://forums.matronics.com* > > *_blank">http://www.matronics.com/contribution* > > * * > > > * * > > ** > > = Use the Matronics List Features Navigator to browse > > Day Browse, Chat, FAQ, > > *w.matronics.com/Navigator?RV10-List">http://www.matronics.com/Navigator? RV1* > > ====================== > > ** > > m">http://forums.matronics.com > > *http://www.matronics.com/contribution* > > ====================== > > * * > > * > =========== =========== =========== =========== > * > > ________________________________ Message 16 ____________________________________ Time: 11:38:02 PM PST US Subject: RV10-List: Miniumum fuel comfort zone From: "AirMike" In re-analyzing my numbers from my trip to OSH - felt that it is best to be on the ground when you have less than 7 gallons in each tank. I have very accurate readings from my tank floats and fuel scan is right on the money. Since a big percentage of accidents are from just running out of gas, I'd like any input on minimum usable fuel in the std tanks so that we can all keep a comfortable safety zone. I also need this info as I fit out my 90 gallon internal tank for the round-the-poles flight - ok just kidding....... -------- OSH '10 or Bust Q/B - finally done Read this topic online here: http://forums.matronics.com/viewtopic.php?p=309710#309710 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-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/rv10-list Browse Digests http://www.matronics.com/digest/rv10-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.