dual idf convetsion, why not dual cables?
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- Scottinaz
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dual idf convetsion, why not dual cables?
As stated in the title, why not use a split cable design, similar to the old cb twins/BMW airhead design. Just inherently inaccurate, or are there other design concerns I'm not seeing? Seems it would be a simpler design, and less issues with fabrication tolerances.
'76 GL1000
- sunnbobb
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Re: dual idf convetsion, why not dual cables?
I like it. Triumph ran them for years
I found the end of the internet
---- Bradshaw Bikes custom polishing for your wing. Visit us on facebook!
1978 Learning Experience
1980 County Road Hauler "Brain Damage"
1978 Cafe Custom Gl1000 "Vyper"
1977 Bulldog Inspired "Vaincre"
1981 Street Fighter GL1100 "No Quarter"
1983 Supercharged Street Drag "Anubis" (in worx)
1983 gl1100 mint restoration "Kristen"
1985 Aspencade..pondering.
---- Bradshaw Bikes custom polishing for your wing. Visit us on facebook!
1978 Learning Experience
1980 County Road Hauler "Brain Damage"
1978 Cafe Custom Gl1000 "Vyper"
1977 Bulldog Inspired "Vaincre"
1981 Street Fighter GL1100 "No Quarter"
1983 Supercharged Street Drag "Anubis" (in worx)
1983 gl1100 mint restoration "Kristen"
1985 Aspencade..pondering.
- Scottinaz
- Titanium Member
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- Joined: Sun Oct 28, 2012 5:14 pm
- Location: San Tan Valley, AZ
Re: dual idf convetsion, why not dual cables?
I bought a cable assembly with the splitter from a Yamaha Venture. will see soon enough if the system might work. Only out less than $20 if its a bust....
'76 GL1000
- gregforesi
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Re: dual idf convetsion, why not dual cables?
There was a european member who went with a BMW splitter. He didn't give us a final report but I should think a splitter design would work fine.
The problem with a mechanical linkage is that the carb shafts are contra-rotating. This builds a very slight differential into the relative angles of carb opening of the left vs the right. When setup correctly it's only about 1° at mid throttle but it is there. The splitter should eliminate that and provide a direct 1:1 relationship.
The main "fussy" thing is the idle mixture. It varies by outdoor temp and humidity. If you adjust the idle mix when it's sunny and 80, and then take it out the next morning at a clammy 60, you may want to spend a quick minute tweaking the mix. There is also a bit longer warm-up time because there is no "choke". Some type of throttle lock is a good idea so you can keep it at a fast idle till it settles in (about 3 to 5 minutes on mine).
This is all part of the hotrod personality you're building into the bike and personally I like it. Just be aware that it won't be a set-em-and-forget-em sort of thing.
The problem with a mechanical linkage is that the carb shafts are contra-rotating. This builds a very slight differential into the relative angles of carb opening of the left vs the right. When setup correctly it's only about 1° at mid throttle but it is there. The splitter should eliminate that and provide a direct 1:1 relationship.
The main "fussy" thing is the idle mixture. It varies by outdoor temp and humidity. If you adjust the idle mix when it's sunny and 80, and then take it out the next morning at a clammy 60, you may want to spend a quick minute tweaking the mix. There is also a bit longer warm-up time because there is no "choke". Some type of throttle lock is a good idea so you can keep it at a fast idle till it settles in (about 3 to 5 minutes on mine).
This is all part of the hotrod personality you're building into the bike and personally I like it. Just be aware that it won't be a set-em-and-forget-em sort of thing.
2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
- past in time tony
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Re: dual idf convetsion, why not dual cables?
I have a lot of time and thought in my linkage, and still not perfect, I agree that 2 cables would be the only way to get a true pull through the entire movement, will be interested to here how it works.
1984 GL1200 Hack & 1975 GL1000
- sunnbobb
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Re: dual idf convetsion, why not dual cables?
Keep us posted Scotty!
I found the end of the internet
---- Bradshaw Bikes custom polishing for your wing. Visit us on facebook!
1978 Learning Experience
1980 County Road Hauler "Brain Damage"
1978 Cafe Custom Gl1000 "Vyper"
1977 Bulldog Inspired "Vaincre"
1981 Street Fighter GL1100 "No Quarter"
1983 Supercharged Street Drag "Anubis" (in worx)
1983 gl1100 mint restoration "Kristen"
1985 Aspencade..pondering.
---- Bradshaw Bikes custom polishing for your wing. Visit us on facebook!
1978 Learning Experience
1980 County Road Hauler "Brain Damage"
1978 Cafe Custom Gl1000 "Vyper"
1977 Bulldog Inspired "Vaincre"
1981 Street Fighter GL1100 "No Quarter"
1983 Supercharged Street Drag "Anubis" (in worx)
1983 gl1100 mint restoration "Kristen"
1985 Aspencade..pondering.
- Scottinaz
- Titanium Member
- Posts: 375
- Joined: Sun Oct 28, 2012 5:14 pm
- Location: San Tan Valley, AZ
Re: dual idf convetsion, why not dual cables?
right now the biggest issue I see is connecting the cables to the carbs. Once I have that one solved, it should be easy.
'76 GL1000
- Scottinaz
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- Joined: Sun Oct 28, 2012 5:14 pm
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Re: dual idf convetsion, why not dual cables?
Well, just bought a set of Randakks manifolds. Now to wait for it all to arrive. Throttle cable set should be here next week. Carbs arrive tomorrow. Fun begins on my next day off.
'76 GL1000
- gregforesi
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Re: dual idf convetsion, why not dual cables?
It's all just problem solving young man.
Oh yeah...and money.
Oh yeah...and money.
2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
- Scottinaz
- Titanium Member
- Posts: 375
- Joined: Sun Oct 28, 2012 5:14 pm
- Location: San Tan Valley, AZ
Re: dual idf convetsion, why not dual cables?
im thinking that something like either of these will make the hookup at the carb a snap, what are the thoughts here?
http://www.ebay.com/itm/281081453835?ss ... 1438.l2649
http://www.piercemanifolds.com/product_p/45041.089.htm
Personally Im more partial to the Harley part, mostly because it doesn't have the massive offset that the other part does. as long as I use a matched pair of linkages, it should take care of any differential in the linkage.
http://www.ebay.com/itm/281081453835?ss ... 1438.l2649
http://www.piercemanifolds.com/product_p/45041.089.htm
Personally Im more partial to the Harley part, mostly because it doesn't have the massive offset that the other part does. as long as I use a matched pair of linkages, it should take care of any differential in the linkage.
'76 GL1000
- past in time tony
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Re: dual idf convetsion, why not dual cables?
I like the harley pulleys better also, should work great.
1984 GL1200 Hack & 1975 GL1000
- gregforesi
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- Location: Venice, FL
Re: dual idf convetsion, why not dual cables?
It's all about the geometry. You will want X amount of rotation at the throttle handle to give you wide open carbs. If the attachement point at the carb is too close to the butterfly shaft you will have a touchy throttle. If its too far away you'll need a lot of rotation of the handle to get them to full open. 1" from butterfly centerline to attachment point centerline is a good place to start.
With the carbs at exactly 1/2 throttle the angle between the cable and carb arm (or attachment point) should be as close to 90° as you can get it. Butterfly rotation is 78° and you want 1/2 throttle right in the middle of that. You needn't be perfect, but close is better.
With the carbs at exactly 1/2 throttle the angle between the cable and carb arm (or attachment point) should be as close to 90° as you can get it. Butterfly rotation is 78° and you want 1/2 throttle right in the middle of that. You needn't be perfect, but close is better.
2006 GL1800 (Brutus Maximus)
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
1978 GL1000 (White Trash - 2012 BOTY
(If you want to discuss the Trashmobile, Webers, Rearsets, Clubmans, or other stuff then send me a PM.)
"Getting old ain't for sissies" - Phyllis Diller
"So how much you gonna spend to win that $5 trophy?" - Cyborg
- Scottinaz
- Titanium Member
- Posts: 375
- Joined: Sun Oct 28, 2012 5:14 pm
- Location: San Tan Valley, AZ
Re: dual idf convetsion, why not dual cables?
ok, moving forward with the cable system, it appears it will work. I got a cb350 split cable, and with a few mods (replaced upper section with pull cable from the Goldwing, both for length, and also for the adjustable section....) I have it rigged up. forgive the vice grips for now, I need to go to work here in a bit, and ran out of time to final mount the cables. Right side wheel needs to be spaced out about 1/8 inch or so, due to interference with the brackets (no where for the cable to go.) other than that, it appears to be a winner.
nothing like the sexy that is Webers
Right wheel
Left wheel
View from the back
nothing like the sexy that is Webers
Right wheel
Left wheel
View from the back
'76 GL1000
- wingrider
- SUPER BIKER!!!!
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Re: dual idf convetsion, why not dual cables?
Good to know it may work....been thinking of doing the same thing on my Weber set up.
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
- past in time tony
- Billet Alum. Member
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- Joined: Mon Jan 07, 2013 1:19 pm
- Location: kansas
Re: dual idf convetsion, why not dual cables?
Wow! Keep up the good work, looks great! keep us in the loop as you progress. Oh, and thanks for shareing.
1984 GL1200 Hack & 1975 GL1000
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