flyrotary@lancaironline.net Mailing List Archive

Hi Finn We were returning fuel from the Fuel rail with the secondary injectors fed by ~8 inch hoses from the rail. I changed this in order to install a Fuel Flow Transducer so shifted the regulator to the firewall where fuel returned to the header tank. So from the firewall forward we are returnless with the flow transducer and insulated fine fuel filter above the engine just before the fuel rail. We’ve not had any issue with fuel vapour locking. Our rail pressure us about 50psi. Steve Izett > On 9 Jun 2020, at 8:56 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote: > > Yep.Except the next run pressing that button didn't do anything. But did go smooth. > Third run today couldn't get it to run smooth (didn't try hard). > > When does shift from rough to smooth, RPM goes up and get a more continuous sound. When rough it's almost as if it doesn't fire half the time, yet mixture monitor shows close to ideal. Weird! > > So still a mystery. Stuck seal? Air in fuel? > I have a returnless system. Regulator just after fuel pumps, returning directly to tank. 3/8" alum tube 3' to firewall, then a 3/8" EFI hose to a Standard filter sitting on top of engine and from there 5/16" EFI hose to Tee to primary and secondary fuel rails. Pressure sender at end of secondary fuel rail (where the damper normally sits). After the first run where I got up to operating temps, I could hear fuel boil after shutdown. Tracy is also using a returnless system in his RV-8, so it can be made to work. However, I may need to move the fuel filter into the fuselage so it doesn't get heated by the engine. Of course if the prop was on it would cool some. > > Finn > > On 6/8/2020 7:44 PM, Stephen Izett stephen.izett@gmail.com wrote: >> Progress Finn. >> Must have been encouraging the it went smooth! >> >> Cheers >> >> Steve >> >>> On 9 Jun 2020, at 12:26 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote: >>> >>> I fixed the engine monitor so it now shows RPM. Had been running it at real low RPMs. Still, very rough. >>> >>> Happened to press button 3 (Cancel) on the EM3 (not EC3) and engine started running smoothly (tested up to about 3,000 PRM). Still without prop. >>> >>> Could be a coincidence, will have to let engine cool down and try again. But first time out of 5 or more runs where it started running smoothly. >>> >>> Now I need to fix an oil lead at filter adapter and move exhaust pipe away from bottom of fuselage so it doesn't melt it and perhaps put on a prop. >>> >>> Finn >>> >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html