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  #1  
Old 01-07-2021, 03:25 PM
SteveL SteveL is offline
 
Join Date: Feb 2014
Location: Granbury, Tx
Posts: 37
Default Starter/engine ground cable

Good evening!
RV7A, firewall mounted Odyssey Battery,Sky Tec light weight starter. Several of Van's electrical drawings show size 2 AWG from starter solenoid to starter. I don't have any 2 AWG but I have plenty of 4AWG with the appropriate connectors. Will the 4 be sufficient or should I order some 2 AWG?
Thanks!
SteveL
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  #2  
Old 01-07-2021, 06:28 PM
bbsdad bbsdad is offline
 
Join Date: Oct 2018
Location: tx
Posts: 86
Default Battery cables

I have seen 4awg used on some aircraft, usually on short runs. 2awg would give you better service. Stronger crank longer life etc..
I personally am using 2awg. I do have over 40 years as an a&p. So just my humble opinion.

RD
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  #3  
Old 01-07-2021, 06:31 PM
mcgaughy mcgaughy is offline
 
Join Date: Mar 2009
Location: Fayetteville, NC
Posts: 58
Default

Not answering your question directly....but I would spend the $ and go with 2 awg. The starter circuit typically does not have a fuse or circuit breaker to protect over current....and you want as much juice as possible going to the starter when it calls for power.
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  #4  
Old 01-07-2021, 06:48 PM
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AlexPeterson AlexPeterson is offline
 
Join Date: Sep 2005
Location: Ottertail, MN
Posts: 2,411
Default

Welding cable often used for this, as the cable is much more flexible. I used that and soldered the terminals onto each end.
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  #5  
Old 01-07-2021, 06:49 PM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 436
Default From Aero Electric Book

This is the Z11 Diagram from the book. The wire is 4AWG to the starter. Of course, it is ultimately down to you.
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Wing -- Closed
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Avionics Installation -- 90%
Firewall Forward -- Prep for cowl install
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  #6  
Old 01-07-2021, 07:58 PM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest
Posts: 1,417
Default 4AWG wire

Are you guys (and gals) using Tefzel 4 AWG wire, or just the standard PVC coated stuff from Lowes?
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WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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Fuselage Kit 98% done
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  #7  
Old 01-07-2021, 08:25 PM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
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I am using the welding grade cables. I was able to find a local electrical/electronic store that sells welding grade cable instead of the standard cable like Lowes.
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RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Done. Fiberglass 80%
Avionics Installation -- 90%
Firewall Forward -- Prep for cowl install
Electrical -- 90%

Donation paid through 2021
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  #8  
Old 01-07-2021, 08:29 PM
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gyoung gyoung is offline
 
Join Date: Jan 2005
Location: Spring, TX
Posts: 282
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I use Tefzel for the power and braided for the ground strap. Stein has both. Why cheap out for just a couple feet of each?
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  #9  
Old 01-08-2021, 08:48 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,995
Default

Quote:
Originally Posted by SteveL View Post
Good evening!
RV7A, firewall mounted Odyssey Battery,Sky Tec light weight starter. Several of Van's electrical drawings show size 2 AWG from starter solenoid to starter. I don't have any 2 AWG but I have plenty of 4AWG with the appropriate connectors. Will the 4 be sufficient or should I order some 2 AWG?
Thanks!
SteveL
On my 6/320, I ran #4 cable from the solenoid to the starter. Spins like a champ. IMO, Tefzel is not required FW fwd, so I used std PVC battery cables.

Larry
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Last edited by lr172 : 01-08-2021 at 08:51 AM.
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  #10  
Old 01-08-2021, 09:29 AM
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Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,324
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4g Tefzel on mine for the past 4 years and no issues with starting. Also swapped the PC680 for EarthX for much better starter speed and improved hot starts. Same for battery/FW ground to engine. If it were going to the aft of the fuselage, I'd use 2g for both.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
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