Re: Carb problem at track
[Re: 70satelliteguy]
#2926190
05/24/21 02:49 PM
05/24/21 02:49 PM
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Joined: Oct 2004
Posts: 2,843 Connecticut
FurryStump
master
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master
Joined: Oct 2004
Posts: 2,843
Connecticut
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Coil? Getting hot? Do you have an AFR gauge on it? Is it going lean?
Last edited by FurryStump; 05/24/21 02:50 PM.
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Re: Carb problem at track
[Re: 727specialist]
#2926781
05/26/21 10:06 AM
05/26/21 10:06 AM
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Joined: Jun 2014
Posts: 3,254 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,254
Md.
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My car does almost the same thing. When it gets hot sometimes it starts to idle lower and almost die out. Sometimes I have to hold the throttle on the line so it wont die out I am thinking maybe the power valve is opening and flooding it. I am going to try a lower vacuum power valve and see if that helps. This a Quick fuel RQ 950. Keith Check the float levels, fuel pressure. Do you have an insulator between carb and intake? Sounds like it's going rich after it warms up. I also don't think it's the PV. Timing?
America First!
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Re: Carb problem at track
[Re: 727specialist]
#2927124
05/26/21 11:29 PM
05/26/21 11:29 PM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Have you tried 34 and 36 also? If not maybe you should Keep in mind that not all timing lights read the same thing, not every body sees the same thing as everyone else, especially timing marks when the motor is revved up A racer friend of mine saw 38 when I saw 34 on his motor with his timing light
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Carb problem at track
[Re: 727specialist]
#2927155
05/27/21 06:43 AM
05/27/21 06:43 AM
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Joined: Jun 2014
Posts: 3,254 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,254
Md.
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I recently replaced all the ignition system chasing a down track misfire. cap-rotor-wires -coil-distributor- plugs ended up fixing the problem even though they looked ok. Yes i kick myself in the butt for that. Should have replace the plugs to start with but live and learn.
I replaced the carb because the new engine needed more cfm. also replaced the fuel pump when it went bad. I had replaced the regulator too as part of the fuel pump diagnosis.
So it seems the only thing I haven't replaced is the msd box it is a 6al maybe i will try a different msd box. I cant think of anything else. Any other ideas? What dist. are you running? Your problems sound like the same problems I was having. Is your timing out of gear the same as it is in gear? Assuming it's an auto. When you roll into throttle without bringing in the boosters or pump shot does the cam sound roudier? What's your initial timing? How much fuel pressure do you have?
America First!
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Re: Carb problem at track
[Re: B1MAXX]
#2927166
05/27/21 07:55 AM
05/27/21 07:55 AM
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Joined: Jun 2014
Posts: 3,254 Md.
carnut68
master
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master
Joined: Jun 2014
Posts: 3,254
Md.
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To the original poster, I think you are relying on the transfer circuit for idle mixture. I would make sure that the idle speed screws are in the same ballpark. In other words after putting the carb on you only moved the primary screw to adjust idle. I would try opening the mixture screws after checking that. I've been waiting to see if he gives an update.
America First!
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Re: Carb problem at track
[Re: carnut68]
#2927194
05/27/21 10:06 AM
05/27/21 10:06 AM
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Joined: Jul 2005
Posts: 1,301 Penna
70satelliteguy
OP
pro stock
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OP
pro stock
Joined: Jul 2005
Posts: 1,301
Penna
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This is a Quickfuel 1250 without power valves. Timing is at 35 with crank trigger ignition. All new carb and intake gaskets. MSD distributor with new cap, rotor and plugs. Fuel pressure 6.5 steady float levels at bottom of window,fresh Sunoco 112. Did not check if idle screws are at the same place. will do that next but am leaning towards air bleed or pump shot problem??? Mike
Last edited by 70satelliteguy; 05/27/21 10:15 AM.
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Re: Carb problem at track
[Re: 70satelliteguy]
#2927211
05/27/21 11:44 AM
05/27/21 11:44 AM
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Joined: May 2005
Posts: 2,013 Apollo, PA.
B1MAXX
top fuel
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top fuel
Joined: May 2005
Posts: 2,013
Apollo, PA.
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This is a Quickfuel 1250 without power valves. Timing is at 35 with crank trigger ignition. All new carb and intake gaskets. MSD distributor with new cap, rotor and plugs. Fuel pressure 6.5 steady float levels at bottom of window,fresh Sunoco 112. Did not check if idle screws are at the same place. will do that next but am leaning towards air bleed or pump shot problem??? Mike after you check to see if the butterfly's are in about the same from front to back . How many turns out are the mixture screws?
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