dual idf convetsion, why not dual cables?

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Scottinaz
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dual idf convetsion, why not dual cables?

#1

Post by Scottinaz »

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.
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Re: dual idf convetsion, why not dual cables?

#2

Post by sunnbobb »

I like it. Triumph ran them for years
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Re: dual idf convetsion, why not dual cables?

#3

Post by Scottinaz »

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....
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Re: dual idf convetsion, why not dual cables?

#4

Post by gregforesi »

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.
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Re: dual idf convetsion, why not dual cables?

#5

Post by past in time tony »

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.
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Re: dual idf convetsion, why not dual cables?

#6

Post by sunnbobb »

Keep us posted Scotty!
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1978 Learning Experience
1980 County Road Hauler "Brain Damage"
1978 Cafe Custom Gl1000 "Vyper"
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1981 Street Fighter GL1100 "No Quarter"
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1983 gl1100 mint restoration "Kristen"
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Re: dual idf convetsion, why not dual cables?

#7

Post by Scottinaz »

right now the biggest issue I see is connecting the cables to the carbs. Once I have that one solved, it should be easy.
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Re: dual idf convetsion, why not dual cables?

#8

Post by Scottinaz »

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.
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Re: dual idf convetsion, why not dual cables?

#9

Post by gregforesi »

It's all just problem solving young man.

Oh yeah...and money.
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Re: dual idf convetsion, why not dual cables?

#10

Post by Scottinaz »

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.
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Re: dual idf convetsion, why not dual cables?

#11

Post by past in time tony »

I like the harley pulleys better also, should work great.
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Re: dual idf convetsion, why not dual cables?

#12

Post by gregforesi »

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.
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.)
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Re: dual idf convetsion, why not dual cables?

#13

Post by Scottinaz »

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.

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nothing like the sexy that is Webers

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Left wheel

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Re: dual idf convetsion, why not dual cables?

#14

Post by wingrider »

Good to know it may work....been thinking of doing the same thing on my Weber set up.
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Re: dual idf convetsion, why not dual cables?

#15

Post by past in time tony »

Wow! Keep up the good work, looks great! keep us in the loop as you progress. Oh, and thanks for shareing. anim-cheers1
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