flyrotary@lancaironline.net Mailing List Archive

Thanks Tracy Your "1000 Pham” I take it is 1K resistor across the CAS pins. Steve > On 30 Jul 2016, at 11:21 AM, Tracy Crook <flyrotary@lancaironline.net> wrote: > > Hi Steve, > Just another possibility FWIW. > > The symptom of acting different with different pitch settings of the prop does not fit this possibility but most everything else does. > > Several ec2 users had similar problems when using it n the Renesis. The ec2 was designed well before the Renesis came out so the sense input circuit is not well matched to the Renesis CAS. Plus, there are at least 4 different versions of the ec2 so that complicates things as well. > > If the MAP sensor tap changes don't help,you might try installing a 1000 Pham resister IN PARALLEL with the CAS . This could be anywhere along the path, either at the CAS or at the ec2. > > There were also some internal retrofit changes I made for ec2 / Renesis users. I can't remember whether you have had them or not. > > Tracy > > > > Sent from my iPad > >> On Jul 29, 2016, at 03:19, steve Izett <flyrotary@lancaironline.net> wrote: >> >> Hi Guys >> >> We did further testing of the Renesis today. Would really appreciate your heads on this. >> Last series of tests we had this major missing and noise which I think is fuel exploding in the exhaust. >> This happens at various RPM’s based on load from the adjustable prop. >> With fine pitch it would spin out to just over 7000rpm before striking this mayhem. >> With medium pitch it would get to 6000rpm before the same symptoms. >> From memory these were both at about 22-23 inches of Hg. >> My Wideband O2 is malfunctioning at present. >> The narrowband response time appears to slow to discover what the mixture is doing during the episodes. >> >> Also still having trouble with the EM3. Sometimes display reads what appears to be an error message and at other times stops reading RPM. >> The Skyview Engine monitor has the same issue at the same RPM so appears directly related. >> I changed the input on the Skyview to the Standard RPM input as I incorrectly fed the injector pulse to the lower voltage input, but this made no difference. >> >> I had wondered if the secondary injectors weren’t getting power and as a consequence when it staged to all 4 injectors the trouble began. >> Using the EM3 display (staging asterisk) and switching power off to the secondaries I was able to ascertain that the secondaries appear to be functioning fine. >> I did notice that the point of staging appears to be not solid. >> This takes me back to Ed’s comments re damping the manifold signal to the EC2. >> Sorry Ed, you might have had it right last week. I thought because it was running so smoothly up to 23 inches that it wasn’t a signal issue. >> Maybe the wavelength/timing of those pulses at ~6000rpm matches the manifold signal tap position! >> >> Ed, you mentioned either small orifice or accumulator. I estimate the volume of the signal line to be approx 18 cubic centimetres. >> My gut was that the accumulator required to damp the signal would need to be an order of magnitude larger. (total guess) >> So maybe 180 cc’s but thats half a Coke can! Seem’s way to big. >> Ed, did I understand you right that a small fuel filter can do the trick? I thought they would only be about 10 cc’s in volume. >> I suppose if the pulses are very narrow/short maybe thats all to takes to damp out the pulses. >> >> Can I ask the group please. Who had trouble with manifold signal and what was the solution that worked best. >> Paul Lamar advocates tapping the signal from the oil injection ports. Has/is anyone using this solution? >> >> Thanks very much everyone. >> >> Steve Izett >> Glasair Super II RG >> Reneis 4 port EC2 EM3 RD1-C >> >> >> >> >> >> >> >> >> -- >> 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