Throttle return spring question
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,484
Likes: 0
From: Northampton Ma
Throttle return spring question
I installed and adjusted the carb linkage on my new 383 with a Speed Demon 750 today. My question is do I need to install a throttle return spring? The linkage and throttle blades return to the "off" (closed) postion as soon as I let go of the throttle, even from WOT. But, will it do this once I have the motor running? I didn't know if maybe the Speed Demon had a built in throttle return. Or am I missing something here? Someone please enlighten me 
Thanks in advance
Thanks in advance
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
yes absolutely....and it should be a double spring (one inside the other) i had to mount my spring so it was up by the 2nd intake bolt from the front.
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Last edited by bobs77vet; Mar 19, 2005 at 08:27 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Yes. Absolutely. You need a throttle return spring. The spring on the throttle shaft is not designed or intended to provide safe and consistent throttle return - Barry Grant even makes a point of this in their otherwise pretty poor installation instructions.
Drifting
Joined: Oct 2004
Posts: 1,259
Likes: 7
From: Ontario
Yes! and you actually need two. Do not rely on the spring built into the carb. You need two return springs, they are wound differently and typical one is placed inside the other. This is a saftey feature. Since the springs are wound different they break at different stress points and age.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Hey Bob -
That's pretty funny... we both said exactly the same thing at the same time without seeing each other's posts before they went up...
That's pretty funny... we both said exactly the same thing at the same time without seeing each other's posts before they went up...
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by lars
Hey Bob -
That's pretty funny... we both said exactly the same thing at the same time without seeing each other's posts before they went up...
That's pretty funny... we both said exactly the same thing at the same time without seeing each other's posts before they went up...
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Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,484
Likes: 0
From: Northampton Ma
Thanks for the replies. I already have the bracket and dual springs, so I'll install them tommorow. Just wanted to be sure that they were neccessary.
Lars- I also setup the carb according to your paper, it was very helpful
Lars- I also setup the carb according to your paper, it was very helpful
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,484
Likes: 0
From: Northampton Ma
I noticed that Bob's spring looks much more durable than what I have.
I have something like this: http://www.jegs.com/cgi-bin/ncommerc...29&prmenbr=361 .
Do you guys think that would be sufficient? Maybe something like this might be better? http://www.jegs.com/cgi-bin/ncommerc...63&prmenbr=361
I have something like this: http://www.jegs.com/cgi-bin/ncommerc...29&prmenbr=361 .
Do you guys think that would be sufficient? Maybe something like this might be better? http://www.jegs.com/cgi-bin/ncommerc...63&prmenbr=361
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Originally Posted by lars
- Barry Grant even makes a point of this in their otherwise pretty poor installation instructions.
Melting Slicks
Joined: Dec 2000
Posts: 2,198
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From: Eastern Connecticut
Originally Posted by Ryan77
I think I will order the second one I listed and toss the one I have. It just looks much stronger and more reliable 
Melting Slicks
Joined: Sep 2003
Posts: 3,050
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From: Orange Ct
Nothing gets your attention more than the throttle going wide open when your not expecting it. The car suddenly seems to have 600 HP and while your thinking about stomping on the clutch or turning off the ign. the world is going by at light speed.
Don't mess with bubba throttle returns.
Don't mess with bubba throttle returns.
Race Director
Joined: Sep 2004
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by joe73vette
The first one is the same as the factory spring. Joe
