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62 Dave
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Joined: August 31, 2012
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Location: SoCal
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 Posted: Mon Apr 15, 2024 7:29 pm Post subject: Improving throttle return on 28 PICT carb? |
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I just put my engine back in after replacing the transmission (Rancho Transaxle rocks BTW), and everything is great except the throttle return spring isn't always dropping the carb down to idle immediately after I take my foot off of the pedal.
Is there a way to improve the spring tension on a 28 PICT carb? I know the later styles of carbs have springs on the carb itself, but I don't see anywhere to put an external spring on my 28.
Thanks
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Dave
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mukluk
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| Posted: Mon Apr 15, 2024 7:41 pm Post subject: Re: Improving throttle return on 28 PICT carb? |
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When's the last time you cleaned and lubed the throttle cable? Same for the linkage at the pedal? Since you mentioned this was after replacing the transaxle, are you sure the cable didn't get rerouted incorrectly or is dragging on the trans?
If you need more oomph from the old style return spring, pull it off and stretch it a bit.
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EverettB 
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| Posted: Mon Apr 15, 2024 8:57 pm Post subject: Re: Improving throttle return on 28 PICT carb? |
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What muluk said but also if you have a solid wire throttle cable - If it got kinked at all while installing the engine, it can drag.
I've had one that had a kink in it near the carb side but where it passes through the throttle tube and I had to bend straight again. Or replace the cable.
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Bub
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| Posted: Tue Apr 16, 2024 8:38 am Post subject: Re: Improving throttle return on 28 PICT carb? |
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| EverettB wrote: |
What muluk said but also if you have a solid wire throttle cable - If it got kinked at all while installing the engine, it can drag.
I've had one that had a kink in it near the carb side but where it passes through the throttle tube and I had to bend straight again. Or replace the cable. |
^^ THIS is the stuff you need to think about.
I'll go even further and say I don't like to use old 'wire' throttle cables at all. 100% of them have been rolled up into a circle for storage, and the stiff wire remembers this shape and acts like a huge light spring and it works against your throttle return spring.
A braided throttle cable is way more neutral.
Adjust the carb with the cable disconnected, verify it works consistently, and then hook up the cable. See if that is part of the problem.
It can also be centrifugal weights in the distributor sticking a little bit.
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Eric&Barb
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62 Dave
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| Posted: Wed Apr 17, 2024 6:35 pm Post subject: Re: Improving throttle return on 28 PICT carb? |
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Ok thanks. New cable, so I don't think it's kinked but I'll check. It kinda feels like it's the shaft in the carburetor but I'll check the cable first.
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thomas.
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| Posted: Thu Apr 18, 2024 1:18 am Post subject: Re: Improving throttle return on 28 PICT carb? |
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I see people putting extra springs on 28 series carb and in fact when I bought my current''62 ragtop it had an extra external spring that was unneeded.
Before tightening the accelerator cable clamp what I do is move it rearward just the slightest bit. Maybe less than a 1/16th of an inch holding the arm its attached to. Basically just pushing the cable forward just the slightest amount while the clamp is loose. Then tighten. What this does is push the accelerator back to where you want it at idle. |
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petrol punk
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| Posted: Thu Apr 18, 2024 7:19 am Post subject: Re: Improving throttle return on 28 PICT carb? |
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| thomas. wrote: |
I see people putting extra springs on 28 series carb and in fact when I bought my current''62 ragtop it had an extra external spring that was unneeded.
Before tightening the accelerator cable clamp what I do is move it rearward just the slightest bit. Maybe less than a 1/16th of an inch holding the arm its attached to. Basically just pushing the cable forward just the slightest amount while the clamp is loose. Then tighten. What this does is push the accelerator back to where you want it at idle. |
+1 on on both of these. I made a steel bracket for an extra return spring until I replaced the stock spring assembly and did what you said, pushing the cable back slightly before tightening the clamp.
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Eric&Barb
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| Posted: Thu Apr 18, 2024 8:06 am Post subject: Re: Improving throttle return on 28 PICT carb? |
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| petrol punk wrote: |
| thomas. wrote: |
I see people putting extra springs on 28 series carb and in fact when I bought my current''62 ragtop it had an extra external spring that was unneeded.
Before tightening the accelerator cable clamp what I do is move it rearward just the slightest bit. Maybe less than a 1/16th of an inch holding the arm its attached to. Basically just pushing the cable forward just the slightest amount while the clamp is loose. Then tighten. What this does is push the accelerator back to where you want it at idle. |
+1 on on both of these. I made a steel bracket for an extra return spring until I replaced the stock spring assembly and did what you said, pushing the cable back slightly before tightening the clamp. |
Both mean forward, as in closer to the front bumper. Definitely needs to be done and one does not need or want 100% of the throttle shaft movement used. If that is done and the cable has no give to it due to being hard onto the stop on the carb, when going over a bump the transaxle mounts flex it could snap the cable.
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62 Dave
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| Posted: Fri Apr 19, 2024 6:34 pm Post subject: Re: Improving throttle return on 28 PICT carb? |
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Update - The cable (new, stock, non-braided) did have a slight kink in it, where it comes out of the tube before the carburetor. I straightened it out, and also stretched out the spring more (not sure why I didn't think of that ) and now it works perfectly.
Thanks for the help.
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Dave
62 Type 1 sunroof
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Eric&Barb
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| Posted: Fri Apr 19, 2024 7:33 pm Post subject: Re: Improving throttle return on 28 PICT carb? |
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Thanks for the update!!!
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