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Carb jet trubbel #1836445 05/29/15 03:26 AM 05/29/15 03:26 AM
Joined: Oct 2006 Posts: 427 Sweden Mopar Guy OP mopar
Mopar Guy OP mopar Joined: Oct 2006 Posts: 427 Sweden	I can get the idel mixture were i whant.... When i set the idel screws on idel standing and then take the car for a spin it will lean out when i brake the car for a stop sign so i had to screw out the idel mixture screws about 3/4 more to make it run on idel when braking the car and it buggs me why !? The carbs i use are BG six barrel carbs that works realy great but i relay would like to lean out the idel if i can.

Re: Carb jet trubbel [Re: Mopar Guy] #1836461 05/29/15 04:56 AM 05/29/15 04:56 AM
Joined: Aug 2003 Posts: 43,359 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,359 Bend,OR USA	Maybe it's sloshing fuel into the motor from the vent tubes on braking Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Carb jet trubbel [Re: Mopar Guy] #1836563 05/29/15 11:54 AM 05/29/15 11:54 AM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	I had the same problem on a old set of mechanical 6 pack holleys I tried raising lowering the floats nothing seems to work. I wanted it to idle at 850 n and about 700 d so I had to raise that to 1000 n to get a 850 in drive it doesn't die now but I have hooked a wide band on it and you can see it lean out the harder you hit the brakes the more it leans out.

Re: Carb jet trubbel [Re: Cab_Burge] #1836726 05/29/15 03:32 PM 05/29/15 03:32 PM
Joined: Jan 2003 Posts: 4,769 Moved to N.E. Tennessee GomangoCuda master
GomangoCuda master Joined: Jan 2003 Posts: 4,769 Moved to N.E. Tennessee	Originally Posted By Cab_Burge Maybe it's sloshing fuel into the motor from the vent tubes on braking Ahh: Cab that can't happen on a sixpk. All three fuel bowls are in front of the vents so the fuel tilts away from the vents on decel. In theory, there is no difference between theory and practice. In practice, there is.

Re: Carb jet trubbel [Re: GomangoCuda] #1836739 05/29/15 03:54 PM 05/29/15 03:54 PM
Joined: May 2003 Posts: 2,414 St. Croix, US Virgin Islands D David_in_St_Croi top fuel
David_in_St_Croi top fuel D Joined: May 2003 Posts: 2,414 St. Croix, US Virgin Islands	Where is the idle feed jet located? At the top or bottom of the well? When you brake with the 6 pak carbs the fuel will slosh to the front of the bowls decreasing the pressure head at the jets. This is supported by the lean mixtures observed. There is a thread in the racingfuelsystems forum that describes the reasons behind relocating the idle jet from the top to the bottom of the idle well on a Holley. Take a look at it and see if ti makes sense for your situation. https://www.facebook.com/THENEWCDRA Proud member of the liberal scientific elite

Re: Carb jet trubbel [Re: David_in_St_Croi] #1836889 05/29/15 08:24 PM 05/29/15 08:24 PM
Joined: Sep 2004 Posts: 6,906 IL, Aurora A ademon master
ademon master A Joined: Sep 2004 Posts: 6,906 IL, Aurora	Originally Posted By David_in_St_Croi Where is the idle feed jet located? At the top or bottom of the well? When you brake with the 6 pak carbs the fuel will slosh to the front of the bowls decreasing the pressure head at the jets. This is supported by the lean mixtures observed. There is a thread in the racingfuelsystems forum that describes the reasons behind relocating the idle jet from the top to the bottom of the idle well on a Holley. Take a look at it and see if ti makes sense for your situation. Yep that's what I think is happening. I tried advancing the timing, raising the float level to halfway up the site hole nothing seemed to work except for nudging the idle to 1,000 in park

Re: Carb jet trubbel [Re: ademon] #1837174 05/30/15 10:10 AM 05/30/15 10:10 AM
Joined: Oct 2006 Posts: 427 Sweden Mopar Guy OP mopar
Mopar Guy OP mopar Joined: Oct 2006 Posts: 427 Sweden	That shore makes a lot of sense ! Thanks !!!!!!!!!!!!!!! Last edited by Mopar Guy; 05/30/15 10:23 AM.

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