---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 05/08/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:07 PM - Re: EGT, CHT wires and alternator B-lead (Fi Dot) 2. 02:00 PM - Re: EGT, CHT wires and alternator B-lead (Robert L. Nuckolls, III) 3. 02:05 PM - Re: EGT, CHT wires and alternator B-lead (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:07:00 PM PST US From: "Fi Dot" Subject: Re: AeroElectric-List: EGT, CHT wires and alternator B-lead ... I know this ain't helping _much_ but when I installed a CGR30P on my Cheetah, I did not notice the note to _not_ run probes along the ignition wires, and did so. You can look at the pictures here: http://79ft.net/entries/misccheetah-cgr-30/. No problems. I asked EI and they said "boo, but keep it - it worked for years for you after all". On my current plane with Gem G2; I think the wires were ran along the B-lead. I'll double check later today. Regardless, I haven't heard of issues from the gentleman who installed it and flown with it for years. I will confirm where the wires run later tonight and reply along with a pic or three. Fedor 'Fidot' Fomichev. Chickenhouse Charger http://79ft.net ------ Original Message ------ From: "rvtach" Sent: 5/7/2019 11:13:10 PM Subject: AeroElectric-List: EGT, CHT wires and alternator B-lead > >Hello all- > >I am in the final throes of wiring my RV-7A and one of the last tasks is t o route the CHT and EGT leads from the engine to the firewall. My question s is- how much clearance, if any, do I need to provide between these temper ature wires and the alternator B-lead? > >I made a really neat, out of the way, bundle with CHT and EGT wires and th e B-lead cable (4 AWG welding cable) and then began to wonder what "noise" i might get in my engine monitor. Way easier and less frustrating to correc t now if needed than later but I can't find any guidance in the Connection book or in the Matronics archives. > >Thank you to everyone on this list. I really appreciate all the education I've gotten from this group over the years. > >-Jim > >-------- >Jim McChesney >Tucson, AZ >RV-7A Finishing Kit > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=489127#489127 > > ________________________________ Message 2 _____________________________________ Time: 02:00:16 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: EGT, CHT wires and alternator B-lead At 11:13 PM 5/7/2019, you wrote: > >Hello all- > >I am in the final throes of wiring my RV-7A and one of the last >tasks is to route the CHT and EGT leads from the engine to the >firewall. My questions is- how much clearance, if any, do I need to >provide between these temperature wires and the alternator B-lead? None. This presumes that there are no installation instructions for your instrumentation recommending such separation. If instructions DO call for separation, I would see if you can get you money back on it and purchase a system designed to work in aircraft (or any other vehicle for that matter!). >I made a really neat, out of the way, bundle with CHT and EGT wires >and the B-lead cable (4 AWG welding cable) and then began to wonder >what "noise" i might get in my engine monitor. Way easier and less >frustrating to correct now if needed than later but I can't find any >guidance in the Connection book or in the Matronics archives. > >Thank you to everyone on this list. I really appreciate all the >education I've gotten from this group over the years. I'm pleased that you've benefited from your participation here . . . spread the word . . . share your own knowledge and help promote the List. Nothing suppresses the value of knowledge more than a failure to skillfully exploit it. Bob . . . ________________________________ Message 3 _____________________________________ Time: 02:05:42 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: EGT, CHT wires and alternator B-lead At 02:06 PM 5/8/2019, you wrote: >... I know this ain't helping _much_ but when I >installed a CGR30P on my Cheetah, I did not >notice the note to _not_ run probes along the >ignition wires, and did so. You can look at the >pictures here: >http://79ft.net/entries/misccheetah-cgr-30/. No >problems. I asked EI and they said "boo, but >keep it - it worked for years for you after all".=C2 > >On my current plane with Gem G2; I think the >wires were ran along the B-lead. I'll double >check later today. Regardless, I haven't heard >of issues from the gentleman who installed it >and flown with it for years. I will confirm >where the wires run later tonight and reply along with a pic or three.=C2 Actually a big help. The dreaded stresses conducted along such wires are really easy to accommodate in the design of engine instrumentation . . . because if they couple from one wire to another, the coupling is weak. Further the electro- magnetic spectrum of such noises are far outside the signals of interest coming in from engine sensors. Standing them off with a bit of simple filtering is a trivial task. Your experience shared supports this notion. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-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/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-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.