Won't go fast
April 27th, 2019, 03:25 PM
#41
Administrator
Join Date: Oct 2009
Location: Poteau, Ok
Posts: 40,515
With the engine off, take the distributor cap off and turn the crank forward and back while watching the rotor. If the crank turns considerably before the rotor turns when you reverse direction. Chances are you need a timing chain set.
I'm confused by your timing numbers.
What is your timing set to at idle without the vacuum advance hooked up
What rpm does the timing stop advancing without vacuum advance hooked up and what is the timing at the point it stops advancing
What is the timing at idle when you hook the vacuum advance to manifold vacuum
I'm confused by your timing numbers.
What is your timing set to at idle without the vacuum advance hooked up
What rpm does the timing stop advancing without vacuum advance hooked up and what is the timing at the point it stops advancing
What is the timing at idle when you hook the vacuum advance to manifold vacuum
April 27th, 2019, 06:15 PM
#42
Registered User
Join Date: Sep 2010
Posts: 471
Your carburetor rebuilding instructions should have a description on how to adjust the air valve wrap. There is a set screw (hex key) that holds the setting and a screw at the end of the shaft to adjust it. If my memory from 40 years ago is correct, there is a coil spring with a hook at the end visible under the top cover of the quadrajet. You loosen the set screw, loosen the screw at the end of the shaft until the hook moves away from a cross shaft. Then you tighten the screw a specific number of turns after the hook contacts the cross shaft. That setting is carb and engine specific, but perhaps it's 1 1/8 turns (don't trust this 40 year old memory, look it up). Once you've done that you tighten the set screw.
April 28th, 2019, 07:22 AM
#43
Registered User
Join Date: Sep 2017
Location: St. Paul Minnesota
Posts: 3,999
Your carburetor rebuilding instructions should have a description on how to adjust the air valve wrap. There is a set screw (hex key) that holds the setting and a screw at the end of the shaft to adjust it. If my memory from 40 years ago is correct, there is a coil spring with a hook at the end visible under the top cover of the quadrajet. You loosen the set screw, loosen the screw at the end of the shaft until the hook moves away from a cross shaft. Then you tighten the screw a specific number of turns after the hook contacts the cross shaft. That setting is carb and engine specific, but perhaps it's 1 1/8 turns (don't trust this 40 year old memory, look it up). Once you've done that you tighten the set screw.
A. you need a 3/32" "L" shaped allen wrench and a small flat blade screw driver. You also hold the screw after you have "pre-loaded the spring-...until you have locked it with 3/32" allen wrench. If you don't, you lose the spring tension.
I used to:
1. loosen 3/32" allen screw
2. open the "Secondary Air Valve" (upper throttle blades) completely.
3. slowly turn the screw with slot (I think clockwise) until the secondary air valve blades are closed.
4. turn the slotted screw another 1/4 turn
5. turn the 3/32" screw to lock.
You can put a small scratch near the slot to mark the position for reference.
B. Address oldcutlass's questions
November 9th, 2019, 05:18 PM
#44
Joe Ralph
Join Date: May 2017
Location: Lansing, Michigan
Posts: 685
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