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12-31-2008, 03:02 PM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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2 ground terminals to same bolt?
Is there any reason why this is a no-no? I have ground straps from battery and from engine block going to the same bolt on my ground block... see photo below.
HAPPY NEW YEAR!!

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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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12-31-2008, 03:07 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Not a problem.
It is acceptable to have up to 3 wires per ground post.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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12-31-2008, 03:26 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Phil,
I did the same as you but my tech inspector wanted to see a secondary ground from my engine to someplace on the engine mount or fuselage. This in case the primary one fails.
We figured the SS lines for the oil and fuel pressure will work just fine.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-31-2008, 04:52 PM
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Join Date: Jan 2005
Location: KS
Posts: 57
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Back-up Engine Ground
For some reason, I forgot to install the ground cable and was working with the starter. The engine of course would barely turn over, but somehow I noticed the SS oil pressure line got warm. A check with my cheapo voltmeter showed no zero ohms from the engine case to the battery... so I was stumped for a moment.
Looks like the SS oil pressure line will work as a back-up ground cable, but may have some current limits or resistance issues. I don't know what the limitations are, or if they are even limitations at all. I would be interested to know if anyone has looked into this.
__________________
Jonathan Cude
EAA 980 Fearless President
Mechanical and Aerospace Engineer
SedanFloral.com
RV-7A :: Penn Yan XS-IO-360 :: Tip-Up :: SkyView
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12-31-2008, 07:01 PM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Bad Idea
Quote:
Originally Posted by Jonathan Cude
........ Looks like the SS oil pressure line will work as a back-up ground cable, but may have some current limits or resistance issues. I don't know what the limitations are, or if they are even limitations at all. I would be interested to know if anyone has looked into this.
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You NEVER want a fluid carrying line to be a current carrier!  Can you imagine a fuel line under pressure with hi-amp current running through it, then it breaks with a spark...............! Yikes! 
Thus the reason for a backup real ground.
__________________
Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
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01-01-2009, 12:10 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Jonathan Cude
For some reason, I forgot to install the ground cable and was working with the starter. The engine of course would barely turn over, but somehow I noticed the SS oil pressure line got warm. A check with my cheapo voltmeter showed no zero ohms from the engine case to the battery... so I was stumped for a moment.
Looks like the SS oil pressure line will work as a back-up ground cable, but may have some current limits or resistance issues. I don't know what the limitations are, or if they are even limitations at all. I would be interested to know if anyone has looked into this.
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This is only a backup and will help get you home, you really don't want to try and start your engine with this.
As I said, they are good for a backup path only.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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01-01-2009, 07:47 AM
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Join Date: Apr 2005
Location: KSLC
Posts: 4,021
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Quote:
Originally Posted by N941WR
This is only a backup and will help get you home, you really don't want to try and start your engine with this.
As I said, they are good for a backup path only.
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I have a heavy braided cable from the engine to the firewall, and don't figure it will break or fall off before an engine mount does. But I'll keep it in mind to check once and a while. At least I can see it through the oil dip stick door opening.
L.Adamson
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