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watch for stuck-wide-open throttle (archive)

[ Follow Ups ] [ 2002 Message Board ] [ Msg. Board FAQ ]

Posted by mike skolones on March 09, 2000 at 18:34:06:

In Reply to: Center pull linkage questions posted by Corey Turner on March 08, 2000 at 15:04:19:

I bought the same kit for my 2002's 45DCOE setup. The carbs are originally from a '66 2000 TI, the TISA carbs, and came with overhead linkage. I had two problems with the cable linkage. First, it seems finicky as to cable routing, and sticks a bit (doesn't return to idle nicely) if the bends aren't just right. Also, if you rev up the car while tuning it by depressing the carb levers with your finger, the cable sleeve is pushed below the carb-mount ferrule and sticks there, leaving the engine to scream at 4000 rpm or so. Finally, and most disconcerting, is if you get the spring placement wrong (I was using the stock coil spring mount points on the TISA manifolds), then the throttles will stick momentarily in the wide-open position when you floor it. This is because the centerpull linkage ears wind up 180 degrees opposite the spring anchor point at WOT. Typically the engine vibrations will cause the throttle to pop closed after a few seconds, but it's nerve wracking when it first happens. If the springs are too stiff, even the vibrations won't release the levers and there's no choice but to shut down the motor, open the hood and close the throttle by hand. Be sure to set up the spring geometry so that there is torque on the levers at WOT.

: Got a new linkage kit from topend in the mail yesterday, my old cable had frayed dangerously because of how close I had mounted it to the throttle pedal (90 deg angle to cable entrance at idle).

: Anyhow, it came w/ a centerpull assembly for the carb throttle arms. You know what i mean, the two pieces that mount together in the middle of the carbs and are adjustable there, completely removing the need for the overhead linkage components.

: I'm wondering what the drawbacks and advantages are to this sort of linkage as opposed to the overhead arm style that I currently have. I'm tempted to try it. The cable brackets from topend will also adapt to my current setup so I should be able to run it either way.

: Also, if I do convert to the centerpull linkage, what do I do about return springs? Thanks.

: Corey

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