Throttle cable bracket differences

carl said:
I'm not into puzzles, jigsaw, candycrush, etc, but Fiat throttle linkage is more a puzzle than any of those! Dual carb conversion linkages are amazingly challenging for an X. You have to find the exact balance of the rod not hitting the cambox cover and getting full rotation of the throttle plates without any binding anywhere. It has to have smooth operation because let's face it, an X throttle pedal is not the smoothest and any binding in the engine bay will just magnify it. I'm a sucker for looking at pictures of what others have done...linkage porn?
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I admit to looking at many pictures of other's linkage adaptations and reading all threads about how to best setup a linkage. I for sure benefited from many people's ingenuity. I'm fortunate to have a trove of X1/9 parts from 33 years of X1/9 ownership and enjoyment to pull from. My linkage is almost as good as I was hoping, only a change of the angle of the ball crank on the carb side is all I need to make it perfect.
 
myronx19 said:
Keep in consideration that the accelerator pedal has a spring on FI cars - so when you hammer on the accelerator pedal, it reduces the pull force on the end of the throttle cable (engine side).

I used this setup on my dual DCOE race car - helped me because I liked to smash on the accelerator pedal real hard :) - helped keep everything from breaking on the carb side.

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Yeah, I'm considering this. Also, this is why I want the hard stop on the cam cover crank so I don't overload the links at the carbs. This is also why the early cars had the spring at the cam cover end of the cable. I don't recall since it was back in the late 90's, but I think adapting the late throttle pedal to a '74 is not a simple bolt-in. I think solid tube in the tunnel is different. Someone correct me if I'm wrong. I might just consider modifying the throttle cable bracket at the cam cover to allow for the installation of the early spring at that end, same result to keep one from breaking stuff.

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SuperTopo said:
Final report on my throttle linkage. Here's the components used to make this work, all standard FIAT parts:

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Cam cover: 1500 FI
Throttle cable: 1974-78
Throttle cable bracket: 1980-1987 FI
Main shaft/crank: 1974-78, no spring at the end of the cable
End pieces of crank: 1980?-1987 end stop, not sure what year the ball-end link came off of - simply flipped around to extend in the right direction
Linkage rod with ball-socket on both ends: 1974-78, bent in a Z ends up being a perfect length and clears everything
Ball welded to DCNF throttle: not sure what year, but it's the one with the long neck on the ball-

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And whoalla! A linkage system that looks factory original. The one thing I messed up on was not welding the ball on the DCNF crank at the right angle to ensure I get the right kinematics and achieve full throttle. Right now I can only get about 90% throttle before the linkage hits a singularity. Time to break out the saw and welder again...

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Keen observers will note the FI fuel line repurposed to feed the carbs. Yes, that's 7.5mm hose WITHOUT a clamp. Not needed and looks legit!
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I had a pair of DCNF 20 years ago. I mostly did the same than you. But, after awhile, I decided I didn't like the bend linkage and did it all over again. I replace the shaft on the cam cover with a threaded rod, allowing me to place the ball for the linkage in a better position for a straight action. Now I'm running a pair of DCOE's, but the car didn't hit the road yet.
 
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