---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 09/16/07: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:06 AM - Starter cct. and temp rise. (Steve Sampson) 2. 11:51 AM - "Fat wire" termination on Z19/RB and Subaru engine (Allen Fulmer) 3. 05:51 PM - Magneto Installation (Donald Harker) 4. 06:06 PM - Re: "Fat wire" termination on Z19/RB and Subaru engine (glaesers) ________________________________ Message 1 _____________________________________ Time: 11:06:56 AM PST US From: "Steve Sampson" Subject: AeroElectric-List: Starter cct. and temp rise. *"On the other hand, an RV with the battery right behind the Firewall can tolerate 4AWG cranking circuits because the * *round trip is only 4 or 5 feet long."* Ref article :*Wire Size Selection / Bob Nuckolls* ** ** *I have been thinking of wiring up the starter cct on an O-320 with #4 since the run is very short, but it leads me to a couple of questions:* ** *1) Anyone know the temp rise on the wire for 250 amps for say 5 secs? (I never crank this long normally.)* *2) Anyone know what the starter current drops to, once the starter is up to speed?* ** *Thanks!* ________________________________ Message 2 _____________________________________ Time: 11:51:46 AM PST US From: "Allen Fulmer" Subject: AeroElectric-List: "Fat wire" termination on Z19/RB and Subaru engine All the pictures of battery contactor hot side terminations seem to be at the starter contactor on either side of the firewall. And then usually connected to Main Bus from there via smaller wire per drawing. On the Eggenfellner Subaru H6 firewall forward package the starter contactor on the starter. I can't seem to visualize what the common fat wire coming forward from the rear mounted battery contactors (Z-19/RB architecture) will attach to? Will it need to pass through the firewall and continue straight to the starter solenoid (contactor) before coming back with smaller size wire to the main bus? Or should I have an insulated bus bar on cockpit side of firewall that fat wire attaches to on its way to the starter contactor on the starter? (The stud on ATC fuse panels seems too small to attach fat wire terminator to?) This would keep feed to main bus out of the engine compartment which seems like a good idea. Or any other suggestions? Pictures. Thanks, Allen Fulmer RV7 QB Fuselage/Finish kit Alexander City, AL ________________________________ Message 3 _____________________________________ Time: 05:51:45 PM PST US From: "Donald Harker" Subject: AeroElectric-List: Magneto Installation Am wiring up a Slick 4375 on a 7A. I am finally straightened out on the wiring per Bob's diagram Z-13. My question is should I see infinite resistance across the P-Lead and ground when the switch is open or am I going to see zero ohms because of the points in the magneto? Any input would be appreciated. Thanks Don Harker N767DH 7A Finishing ________________________________ Message 4 _____________________________________ Time: 06:06:22 PM PST US From: "glaesers" Subject: AeroElectric-List: Re: "Fat wire" termination on Z19/RB and Subaru engine Allan, You asked: "Will it need to pass through the firewall and continue straight to the starter solenoid (contactor) before coming back with smaller size wire to the main bus?" That's exactly what I did on my H6. I then ran an 8AWG wire from the solenoid to a Current Limiter, and then to the Alternator. I took my feed for the primary bus by splicing an 8AWG wire on to the 'fat' 6AWG wire before it goes through the firewall, so that I only have only the 6AWG wire going through the firewall. Dennis Glaeser RV-7A - H6 installed, Fuselage painted and at the airport, painting the tail feathers now, wings next. Waiting for my prop and cowl ducts. ------------------------------------------------------------------------------------- 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.