throttle spring help

6

68blackv8

New Member

Jun 5, 2007

34

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Jul 21, 2007

#1

• Jul 21, 2007

• #1

dont really know how to askthis so...'

right now my throttle spring (spring that allows the carb butterfly valve to close backup after pushing the accelorator pedal) has no mount. the spring is strecthed forward and hangin on a hole on the engine block. what is the spring supose to be attacthed to? i can get pics if you still dont know what i mean

thanks

for a 68 mustang

 

hhead

Founding Member

Jul 13, 2002

280

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17

so cal

Jul 21, 2007

#2

• Jul 21, 2007

• #2

I bought the double return spring from Summit. it included the mount.

 

ratio411

Founding Member

Apr 21, 2002

3,870

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109

Pensacola FL

Jul 21, 2007

#3

• Jul 21, 2007

• #3

Word of warning:
Use a spring, but don't make it too tight.
This has a direct affect on how long your carb lasts.
Too much spring pressure will wear out your throttle plate.

 

hhead

Founding Member

Jul 13, 2002

280

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17

so cal

Jul 21, 2007

#4

• Jul 21, 2007

• #4

That's why I never liked looking at a stretched spring, made to fit where it's not supposed to.
A proper mount is the key.
I suppose you could fab a bracket to the carb mounting bolt.

 

6

68blackv8

New Member

Jun 5, 2007

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Jul 21, 2007

#5

• Jul 21, 2007

• #5

hhead said:

I bought the double return spring from Summit. it included the mount.

Click to expand...

can you post a link?

 

enferno

Member

Jun 20, 2006

418

2

16

Jul 22, 2007

#6

• Jul 22, 2007

• #6

you can kinda see what i did on my old motor. just a bent piece of metal with a hole drilled in it

 

Rusty67

20+ Year Stangneter

Dec 3, 2002

3,749

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LA, CA

Jul 22, 2007

#7

• Jul 22, 2007

• #7

enferno said:

you can kinda see what i did on my old motor. just a bent piece of metal with a hole drilled in it

Click to expand...

You should have the spring mounted on towards the front of the motor, not the rear. This will help to prolong the life of your carb.

 

enferno

Member

Jun 20, 2006

418

2

16

Jul 22, 2007

#8

• Jul 22, 2007

• #8

Rusty67 said:

You should have the spring mounted on towards the front of the motor, not the rear. This will help to prolong the life of your carb.

Click to expand...

how does that work? it would just pull the plates open?

 

Rusty67

20+ Year Stangneter

Dec 3, 2002

3,749

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Jul 22, 2007

#9

• Jul 22, 2007

• #9

You have to change the hole the spring mounts into otherwise you are right, it would pull the carb open lol.

 

enferno

Member

Jun 20, 2006

418

2

16

Jul 22, 2007

#10

• Jul 22, 2007

• #10

Rusty67 said:

You have to change the hole the spring mounts into otherwise you are right, it would pull the carb open lol.

Click to expand...

i've always run rear-mounted return springs.

should i attempt differently for my new motor? carbing a '91 mustang 5.0 with a holley 4160

how does it extend the carbs life?

 

Rusty67

20+ Year Stangneter

Dec 3, 2002

3,749

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109

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Jul 22, 2007

#11

• Jul 22, 2007

• #11

It keeps the bushings from wearing out as fast.

 

BullittStangV8

Founding Member

Oct 5, 2002

1,104

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36

NJ

Jul 22, 2007

#12

• Jul 22, 2007

• #12

Arnt you suppose to have a return spring on both sides to prevent a stuck throttle either way? I'm fairly sure NHRA require 2 return springs.

 

1

19stang66

Member

Apr 16, 2003

689

0

16

Jul 23, 2007

#13

• Jul 23, 2007

• #13

Here's the link to the Summit throttle return springs and bracket kit, http://store.summitracing.com/egnsearch.asp?N=700+4294925239+4294839063+4294822503+115+4294865275

Does anyone have pics of this installed? Their directions aren't that helpful

 

HookandLadder

Founding Member

Feb 17, 2001

261

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17

St Louis

Jul 23, 2007

#14

• Jul 23, 2007

• #14

The double spring is a spring inside a spring. It should also be mounted to pull in the direction of the cable or rod to close the blades, NOT forward. A double spring is mandated on some classes...not all. Keep from over stretching the springs as this will prematurely wear out the bushing in the carb body.

 

hhead

Founding Member

Jul 13, 2002

280

0

17

so cal

Jul 24, 2007

#15

• Jul 24, 2007

• #15

two springs, one in case the other breaks.
You don't need a stuck wide open throttle!

 

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fasttback

New Member

Apr 16, 2005

471

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0

Northern CA

Jul 24, 2007

#16

• Jul 24, 2007

• #16

A couple more custom brackets...

 

6

68RCodeConv

New Member

Oct 2, 2003

345

0

0

Houston, TX

Jul 25, 2007

#17

• Jul 25, 2007

• #17

Check the NPD catalog for part # 9741 (throttle return spring bracket). Most of them are designed to mount under the driver's rear carb stud nut.