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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Mon Feb 01, 2010 11:46 am Post subject: Dual Carb Engine Wiring |
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I am updating the Dual Carb Adjustment Procedure. This is a prerequisite deal that could make your life a lot easier.
Take a look at this diagram. This is how I wired my Road Warrior's dual carb engine for elegant ease of maintenance . . . it is not as complicated as it looks.
Your modern coils have three spades each on the (+) and (-). Obtain the two-fer-one terminals. They come as Y's or U's, I prefer the Y's.
You will need all six resultant (+) spades, even seven with Pertronix.
- tachometer I had a pigtail leading to the ceiling where the wire joined the rear window defogger wire for a trip to the dashboard.
- green wire to condensor/breaker points, or Pertronix negative.
- this page left blank
+ 1 reverse fuse
(I branched this additionally with "U" terminal for Pertronix +. Disconnect when leaving ignition on for any reason.
+ 2 central cut-off goes into left harness. Scratch a little "C" into the coil in line with this spade terminal.
+ 3 right cut-off goes into right harness. Scratch a little "R" in the coil in line with this spade terminal.
+ 4 left cut-off goes in left harness. Scratch a little "L" in the coil in line with this spade terminal.
+ 5) left choke and fuel enrichment device go in the left harness. Split this wire at the coil so it can go into the right harness.
+ 6 ignition supply wire, make sure that you can easily reach this.
If you have plastic insulated spade terminals, use a razor blade to trim the plastic off the inside edge that is next to its mate on the "Y". Because I did not have pretty wire to distinguish all these things, I used alternating blue and red tinted plastic insulated spade terminals for the cut-offs.
Now, when you are tuning your dual carb bus, you can easily shut off the central idling circuit "C" when checking dual carb mixtures, you can do a power balance test between left and right carbs, you can disable the Pertronix when testing reverse lights or other times you need to have ignition on. Use De-Ox gel on the C/R/L terminals and they will slide off easily and still have good continuity. Most importantly, these E-Z Access coil terminals will save your cut-off spades from getting damaged or loosened by too much handling. Many dual carb buses suffer from backfires and power loss and stalling due intermittant contact inside the cut-offs from too much mucking around.
Colin (picture now hosted on theSamba for greater clarity 02/02/10) _________________ www.itinerant-air-cooled.com
Last edited by Amskeptic on Tue Feb 02, 2010 5:52 pm; edited 1 time in total |
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rustbus Samba Member
Joined: June 18, 2009 Posts: 2078 Location: alberta
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Posted: Mon Feb 01, 2010 12:35 pm Post subject: |
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awsome, thanks for this Colin, I'll be getting to my wiring again soon and I was starting at my carb wiring wondering if I could do things better.
Any chance you could upload a larger version of your drawing?
got any pics of the coil in question?
Very nice drawing by the way. _________________ May of '72 Deluxe. 2.0L L-Jet CS & 091 trans conversion
my Bus thread |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Mon Feb 01, 2010 3:10 pm Post subject: |
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rustbus wrote: |
awsome, thanks for this Colin, I'll be getting to my wiring again soon and I was starting at my carb wiring wondering if I could do things better.
Any chance you could upload a larger version of your drawing?
got any pics of the coil in question?
Very nice drawing by the way. |
Picture now hosted on theSamba - 02/02/10
If you open the picture in a different window (just click it) and expand with your browser, you can see a larger lousy image with even less acuity.
This here is missing a few wires, since it photographed in my dining room.
You can see the harnesses though.
Colin
_________________ www.itinerant-air-cooled.com
Last edited by Amskeptic on Tue Feb 02, 2010 5:53 pm; edited 1 time in total |
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Alex6373 Samba Member
Joined: August 05, 2007 Posts: 876 Location: Vancouver Island,B.C.
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Posted: Mon Feb 01, 2010 6:28 pm Post subject: |
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Thanks so much great info i just am about to re do this wiring after I burned up the harness when it shorted out going through the tunnel in Richmond. |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Tue Feb 02, 2010 5:37 pm Post subject: |
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autobus73 wrote: |
Thanks so much great info i just am about to re do this wiring after I burned up the harness when it shorted out going through the tunnel in Richmond. |
Ouch, what a place to choose to burn up a harness.
I would love it if my dual carb visits would update their coils to this method. It makes tune-up day a joy!
. . . ok, less of a pain. _________________ www.itinerant-air-cooled.com |
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ToolBox Samba Member
Joined: January 27, 2004 Posts: 3439 Location: Detroit, where they don't jack parts off my ride in the parking lot of the 7-11
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Posted: Wed Feb 03, 2010 11:29 am Post subject: |
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Why not just take all that extra load off the coil? Add a relay and use the original coil feed to run the accessories and trigger a relay to feed the coil. Add a Weatherpak connector and call it good. |
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bsairhead Samba Member
Joined: October 08, 2008 Posts: 3475 Location: viroqua wi.
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Posted: Wed Feb 03, 2010 11:37 am Post subject: |
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There's no extra load on the coil.It's just a terminal block |
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ToolBox Samba Member
Joined: January 27, 2004 Posts: 3439 Location: Detroit, where they don't jack parts off my ride in the parking lot of the 7-11
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Posted: Wed Feb 03, 2010 12:00 pm Post subject: |
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bsairhead wrote: |
There's no extra load on the coil.It's just a terminal block |
2 choke elements
3 idle cutoffs
1 fuel enrichment
Those are all loads on the same supply to the coil.. Might be small loads but if you want a better spark output you could remove them from the coil current supply. |
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bsairhead Samba Member
Joined: October 08, 2008 Posts: 3475 Location: viroqua wi.
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Posted: Wed Feb 03, 2010 12:45 pm Post subject: |
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I agree.But coil load and coil supply are to different things |
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ToolBox Samba Member
Joined: January 27, 2004 Posts: 3439 Location: Detroit, where they don't jack parts off my ride in the parking lot of the 7-11
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Posted: Thu Feb 04, 2010 9:47 am Post subject: |
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bsairhead wrote: |
I agree.But coil load and coil supply are to different things |
I just re-read my fist statement and I had it worded wrong.
Remove all extra consumers from the coil circut. |
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Alex6373 Samba Member
Joined: August 05, 2007 Posts: 876 Location: Vancouver Island,B.C.
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Posted: Fri Feb 12, 2010 7:56 pm Post subject: |
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Heres a picture of what you inspired me to do to clean up my wiring that fried in the summer in the tunnel !
All circuit's are disconnect able for tuning and colour coded. Thank's again for the great Idea! |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Sat Feb 13, 2010 12:58 am Post subject: |
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autobus73 wrote: |
Heres a picture of what you inspired me to do to clean up my wiring that fried in the summer in the tunnel !
All circuit's are disconnect able for tuning and colour coded. Thank's again for the great Idea!
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Wow, nice work! It makes tune-up day easier, and I love having it for quick on-the-fly carb tweaks . . . wait, I used to love having it .
I hope to visit many dual carb bus people over the summer to help me get my "fix" while I give them their fix.
Colin _________________ www.itinerant-air-cooled.com |
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Krautski Samba Member
Joined: March 28, 2009 Posts: 874 Location: WA
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Posted: Sat Feb 13, 2010 11:51 am Post subject: |
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That's good inspiration to clean up my somewhat messy coil wiring, and replace the brittle shit preemptively. _________________ BUS FOR SALE
Quote: |
I stopped reading after volksaru and busaru |
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rustbus Samba Member
Joined: June 18, 2009 Posts: 2078 Location: alberta
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Posted: Sat Feb 13, 2010 11:54 am Post subject: |
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All we need now is a materials list, cut lengths, heat shrink qty's, and we wont have to think for ourselves....what do you say Colin, you got time for that sort of thing ?
...actually seriously though, that would be sweet. _________________ May of '72 Deluxe. 2.0L L-Jet CS & 091 trans conversion
my Bus thread |
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Alex6373 Samba Member
Joined: August 05, 2007 Posts: 876 Location: Vancouver Island,B.C.
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Posted: Sat Feb 13, 2010 1:13 pm Post subject: |
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I went to Princess Auto here in BC and picked up twenty bucks worth of wire a package of shrink wrap some double spade and single spade terminals, as a plus I have lot's of wire left for other clean up job's Hey Amskeptic I also liked your vacuum line drawing , this is what I think a lot of people need here on the site to be able to correctly get thing's in shape so that these machines can be tuned to run the way they were intended Very Nice work Thanks again
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teuton Samba Member
Joined: April 02, 2003 Posts: 334 Location: Abilene Texas
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Posted: Wed Mar 31, 2010 2:32 pm Post subject: |
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That diagram is super cool. How did you make it? By hand then scanning? Awesome work! _________________ 1965 VW Beetle |
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