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Re: Carb experts with Hemi crossram intake.
[Re: maximus]
#2530682
08/02/18 09:38 PM
08/02/18 09:38 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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I have a Hemi with original magnesium cross-ram intake and new Holley cross-ram carbs. The car starts and idles perfect, good throttle response when car idle in park. The problem. If I give a quick jump of the throttle in gear it sometimes drops down to 600 rpm and comes back up to idle, most of the time it just falls off and stalls. Quick turn of the key and it restarts. What needs to be adjusted or looked at on the carbs to fix this problem? Idle mixture screws are all set at 1 1/2 turns out. Any input appreciated. Usually in my experience if it falls flat on it's face, it's lean, if it blubbers then dies then it's rich............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Carb experts with Hemi crossram intake.
[Re: maximus]
#2530944
08/03/18 01:28 PM
08/03/18 01:28 PM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Are the carbs specific to the engine & manifold?
Do they have power valves?
Boffin Emeritus
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Re: Carb experts with Hemi crossram intake.
[Re: maximus]
#2530986
08/03/18 02:43 PM
08/03/18 02:43 PM
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Joined: Jan 2004
Posts: 8,251
fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,251
fredericksburg,va
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I have a Hemi with original magnesium cross-ram intake and new Holley cross-ram carbs. The car starts and idles perfect, good throttle response when car idle in park. The problem. If I give a quick jump of the throttle in gear it sometimes drops down to 600 rpm and comes back up to idle, most of the time it just falls off and stalls. Quick turn of the key and it restarts. What needs to be adjusted or looked at on the carbs to fix this problem? Idle mixture screws are all set at 1 1/2 turns out. Any input appreciated. 600? What's your idle rpm? 600-750 is in the good range. Did you open up the throttle blade past the slot? Could be way past and using the main circuit instead of the idle. Are the back ones shut tight?
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Re: Carb experts with Hemi crossram intake.
[Re: maximus]
#2531023
08/03/18 03:47 PM
08/03/18 03:47 PM
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Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,786
Rio Linda, CA
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Idle mixture screws are all set at 1 1/2 turns out. Turn all the idle screws out (richen) a half-turn at a time to see if it improves.
The INTERNET, the MISinformation superhighway
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Re: Carb experts with Hemi crossram intake.
[Re: John_Kunkel]
#2531051
08/03/18 04:32 PM
08/03/18 04:32 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Idle mixture screws are all set at 1 1/2 turns out. Turn all the idle screws out (richen) a half-turn at a time to see if it improves. Good advice and where I usually start. Get a wide band and it's eye opening as to how much affect they have on idle, transition and cruise........... 
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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