So, the throttle return spring is actually there providing resistance to foot pressure, in addition to returning the throttle to its "home" position. Makes sense, now that I think about it.
Thanks, I'll check it out.
Jerry
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| Author: | '74 Sport [ Tue Jul 26, 2005 8:13 pm ] |
| Post subject: | Is the throttle supposed to be this sensitive? |
My son's slant six-powered Dart Sport has the Super Six with Carter BBD. As he backed it out of the shop and pulled it around behind the trailer to load up for a trip to the paint shop, it kept spinning out in the gravel and dirt. I got in to drive it up onto the trailer, and as he said, just the slightest tap on the throttle made it spin the tires and lurch forward. It was very twitchy getting it up on the trailer. In addition to the Super Six, we put in a new Comp Cams 264S-10, had the cylinders bored 0.030" over, and had the A-904 freshened up. We never drove the car before all this work began, so I don't have a point of reference. Is this throttle sensitivity normal, or is there something that needs adjusting? Jerry |
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| Author: | SlantSixDan [ Tue Jul 26, 2005 8:58 pm ] |
| Post subject: | |
Reminds me of the time I drove Bob and Lorena Hodgson's South African '73 Chrysler Valiant Charger 190 Sports Coupé in England (that's a '71 Demon with the steering wheel on the right and a factory 2bbl 225 and other goodies.) Bob had swapped on a 4bbl and the throttle linkage wasn't quite right; the cable attached too close to the throttle shaft's axis, making the accelerator super-touchy. Sounds to me as though you want to take a close look at the throttle linkage setup. |
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| Author: | '74 Sport [ Tue Jul 26, 2005 10:32 pm ] |
| Post subject: | |
Will do. |
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| Author: | slantvaliant [ Wed Jul 27, 2005 6:09 am ] |
| Post subject: | |
Detroit engineers played with a "treadle" accelerator and brake pedal system in the fifties and sixties. The input was pressure, more than motion, with a very short pedal movement. They found that drivers could learn to drive with them well, but if they so much as wore a different shoe, there was a steep learning curve. The transition from driving a car with conventional pedals to the treadle car was also difficult. |
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| Author: | Thropar [ Wed Jul 27, 2005 8:12 am ] |
| Post subject: | spring time |
...could be the throttle return spring, if it's too light this can happen... |
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| Author: | '74 Sport [ Wed Jul 27, 2005 11:39 am ] |
| Post subject: | |
So, the throttle return spring is actually there providing resistance to foot pressure, in addition to returning the throttle to its "home" position. Makes sense, now that I think about it. Thanks, I'll check it out. Jerry |
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| Author: | ET's_Swinger [ Wed Jul 27, 2005 3:05 pm ] |
| Post subject: | |
You do have a little bit of slack (about 1/4 inch at closed throttle works well) in the throttle cable, don't you? A cable with no slack can hold the throttle plates open, and make the car jumpy when you hit the gas. Just another thing to check. |
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| Author: | Slant6Ram [ Wed Jul 27, 2005 3:42 pm ] |
| Post subject: | Like mine |
My aspen has been super sixed, and is similiar in that you must push kind of hard and then all at once the trottle opens and the car takes off. I believe part of my problem is that I have the old throttle cable which is too long and loops between the firewall and the carb. This causes a little binding. Another trick I noticed is that it I feels like it could be vacuum holding the throttle plates closed. If you adjust the idle screw open a little more and then correct the idle speed with the mixture screws it seems like you can reduce the condition a bit. It takes a little of the fun out of things, but is much more predictable from a stop. |
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| Author: | Jeb [ Wed Jul 27, 2005 8:32 pm ] |
| Post subject: | |
Quote: Detroit engineers played with a "treadle" accelerator and brake pedal system in the fifties and sixties. The input was pressure, more than motion, with a very short pedal movement. They found that drivers could learn to drive with them well, but if they so much as wore a different shoe, there was a steep learning curve. The transition from driving a car with conventional pedals to the treadle car was also difficult.
What is a treadle pedal system? This is something I have never heard but would like to know about it. |
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| Author: | Jukka-80Aspen [ Thu Jul 28, 2005 4:41 am ] |
| Post subject: | |
I had same problem that Slant6Ram told, throttle cable was too long and made loop between the firewall and the carb. Car was terrible to drive. I bought new cable and it didn't help, it was too long also. Then I cut the old cable shorter and I soldered with tin, what is its name, kind of little ball in the head of cable that comes to the slot in the pedal. Well, sorry my bad english. But it helped, now the pedal works very smoothly. I recommend doing that if the cable is too long. |
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