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Dual Holley 770 Carbs won't Idle under 1500RPM
#1324632
10/22/12 09:06 PM
10/22/12 09:06 PM
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Anonymous
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Maybe someone on here can help me figure out why my 770 Super Stock holley carbs won't Idle under 1500 RPM's.Linkage seems to be set correctly for both carbs.
I tried everything from setting the floats correctly to 5.5 psi fuel pressure to getting air mixture screws turned for highest idle.
These puppy's wont idle low, never seen this before.
What am I missing here? I'm a confused individual.
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
[Re: MR_P_BODY]
#1324635
10/22/12 10:17 PM
10/22/12 10:17 PM
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Quote:
Is your timing set... whats it set at(idle)
35 degrees locked out with pro billet distributor MSD.
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
[Re: astjp2]
#1324636
10/22/12 10:18 PM
10/22/12 10:18 PM
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Quote:
check your secondary butterfly stops. Tim
Thankyou for your reply. Can you explain why this would affect why it won't idle low?
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
#1324637
10/22/12 10:31 PM
10/22/12 10:31 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
check your secondary butterfly stops. Tim
Thankyou for your reply. Can you explain why this would affect why it won't idle low?
Drawing too much air from the secondaries and it
wouldnt be on the idle circuit
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
[Re: MR_P_BODY]
#1324638
10/23/12 09:20 AM
10/23/12 09:20 AM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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Recheck the float level on the one you lowered the float on when it was bleading over. It may have been a stuck needle and seat and not necesarly too high, and now after adjusting it it is too low. It was ok on the dyno!!!!!!!!!!!!!!!
JAKES AUTOMOTIVE
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
[Re: Plymouth340]
#1324642
10/23/12 07:23 PM
10/23/12 07:23 PM
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Quote:
is there holes drilled in the throttle blades? had this problem with mine. All four throttle blades had holes in them and i put tape over two of them and it idled down so i replaced the two throttle blades and it idled great
No, stock carbs.I'm thinking maybe the secondaries are sticking due to a gasket hanging it up on the aluminum spacer.
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
#1324643
10/23/12 07:34 PM
10/23/12 07:34 PM
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Joined: Dec 2005
Posts: 1,495
Shelby mi.
JAKE68
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Posts: 1,495
Shelby mi.
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hey Bill did you reset the float yet? It was idling good on the dyno so if you lowered the float because it was bleeding over then you cut off the fuel to that bowl. Make sure that the fuel pressure isnt above about 5-5.5 lbs max on those carbs.
JAKES AUTOMOTIVE
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Re: Dual Holley 770 Carbs won't Idle under 1500RPM
[Re: JAKE68]
#1324644
10/23/12 07:42 PM
10/23/12 07:42 PM
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Quote:
hey Bill did you reset the float yet? It was idling good on the dyno so if you lowered the float because it was bleeding over then you cut off the fuel to that bowl. Make sure that the fuel pressure isnt above about 5-5.5 lbs max on those carbs.
I'll try it out Jake tomorrow, its nice to be retired.
If i cant get it, I'll bring it over to your shop if that is alright with you, just let me know if morning or afternoon is better.
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