Today's Message Index:
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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
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Subject: | 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
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Subject: | "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
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Subject: | 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
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Subject: | 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.
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