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Re: Carb Tuneing
[Re: sixpackgut]
#1092754
10/12/11 10:41 AM
10/12/11 10:41 AM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Quote:
Quote:
Well I guess Ill drill the primaries. What is a good starting point for the drill size? I have a small pinvise, and some torch cleaning drill bits, so I do have some very small drill bits.
Kasey
i wouldnt drill anything yet. what exactly is the problem?
it is diesling after you shut off? to much air and fuel getting in the carb. drilling holes will make it rpm higher. you only drill holes if you have to open the throttle blades to far to get the idle rpm you desire
how is the fuel getting into the motor with the AF screws seated? this your problem. i would suspect they are not really seating. demon carbs have that funky bowl that goes over the metering block. is it stopping the AF screws from turning in all the way?
This is a quick fuel holley, not a demon. Its on my demon though  .
Everything seems to be ok, and nothing seems plugged. The problem is a rich idle. Will not propperly tune inn, and wont kill off when screws are turned inn telling me Im past my idle slots.
Im very close to going nutso here. Pluss ive set every carbon menoxid detector of in the whole city block it seems like. There was 3 of them going off in the shop last night. 
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Re: Carb Tuneing
[Re: Moparnut426]
#1092755
10/12/11 11:00 AM
10/12/11 11:00 AM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Quote:
Quote:
Well I guess Ill drill the primaries. What is a good starting point for the drill size? I have a small pinvise, and some torch cleaning drill bits, so I do have some very small drill bits.
Kasey
i wouldnt drill anything yet. what exactly is the problem?
it is diesling after you shut off? to much air and fuel getting in the carb. drilling holes will make it rpm higher. you only drill holes if you have to open the throttle blades to far to get the idle rpm you desire
how is the fuel getting into the motor with the AF screws seated? this your problem. i would suspect they are not really seating. demon carbs have that funky bowl that goes over the metering block. is it stopping the AF screws from turning in all the way?
This is a quick fuel holley, not a demon. Its on my demon though .
Everything seems to be ok, and nothing seems plugged. The problem is a rich idle. Will not propperly tune inn, and wont kill off when screws are turned inn telling me Im past my idle slots.
Im very close to going nutso here. Pluss ive set every carbon menoxid detector of in the whole city block it seems like. There was 3 of them going off in the shop last night.
 thats funny
take a pic of the throttle blades and transfer slots on the pri and secondary as you have it right now.
did you try calling QF?
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Carb Tuneing
[Re: Crizila]
#1092758
10/12/11 01:20 PM
10/12/11 01:20 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Kasey, Like i was telling you as we discused, Its deiseling do to a high idle, If you feel its rich & have pin drills, start opening up the 4 outer bleeds in .003" increments, Do not drill holes in the butterflies, that is a "last" resort, I'm sure the mix screws will start responding once you open up the IABs .003", those will be the outers, I'm guessing there .070", open them to .073", I had to open mine to .075" front & .073" back with my PF 750, The quik fuel is based on that floormat, Theres something else you need to check, make damn shure the gasket on the PV is not seeping, If there is a good seal on the MB & PV gaskets there should be no fuel behind the block in the "vacuum well" when you pull it off after draining, If its puddling in that area thats your problem, there should also be no heavy puddling in the intake, Have you checked the plugs too make sure there not foiling out, This also creats havick when trying to tune the idle.
Another thing you can do IF the IABs do not respond well, i had to do this on my PF, There are IFRs in the metering blocks, they should be screw-in bleeds, you can decrease that size by .003" on each (all 4). The carb can be tuned out for a clean idle without major headaches trust me, just some patiance & a general idea of what the engines telling you. BUT 1st. Make sure the plugs are fine & the PV/Bowl gaskets aren't leaking. DO NOT drill the butterflies just yet.
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Re: Carb Tuneing
[Re: joedust451]
#1092759
10/12/11 01:26 PM
10/12/11 01:26 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Kasey, Like i was telling you as we discused, Its deiseling do to a high idle, If you feel its rich & have pin drills, start opening up the 4 outer bleeds in .003" increments, Do not drill holes in the butterflies, that is a "last" resort, I'm sure the mix screws will start responding once you open up the IABs .003", those will be the outers, I'm guessing there .070", open them to .073", I had to open mine to .075" front & .073" back with my PF 750, The quik fuel is based on that floormat, Theres something else you need to check, make damn shure the gasket on the PV is not seeping, If there is a good seal on the MB & PV gaskets there should be no fuel behind the block in the "vacuum well" when you pull it off after draining, If its puddling in that area thats your problem, there should also be no heavy puddling in the intake, Have you checked the plugs too make sure there not foiling out, This also creats havick when trying to tune the idle.
Another thing you can do IF the IABs do not respond well, i had to do this on my PF, There are IFRs in the metering blocks, they should be screw-in bleeds, you can decrease that size by .003" on each (all 4). The carb can be tuned out for a clean idle without major headaches trust me, just some patiance & a general idea of what the engines telling you. BUT 1st. Make sure the plugs are fine & the PV/Bowl gaskets aren't leaking. DO NOT drill the butterflies just yet.
 if you can tell me what IFR you have in your blocks now, maybe i could trade you if i have smaller ones. they are the brass jets near the top corners
Last edited by sixpackgut; 10/12/11 01:26 PM.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Carb Tuneing
[Re: sixpackgut]
#1092760
10/12/11 04:21 PM
10/12/11 04:21 PM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
|
Quote:
Quote:
Kasey, Like i was telling you as we discused, Its deiseling do to a high idle, If you feel its rich & have pin drills, start opening up the 4 outer bleeds in .003" increments, Do not drill holes in the butterflies, that is a "last" resort, I'm sure the mix screws will start responding once you open up the IABs .003", those will be the outers, I'm guessing there .070", open them to .073", I had to open mine to .075" front & .073" back with my PF 750, The quik fuel is based on that floormat, Theres something else you need to check, make damn shure the gasket on the PV is not seeping, If there is a good seal on the MB & PV gaskets there should be no fuel behind the block in the "vacuum well" when you pull it off after draining, If its puddling in that area thats your problem, there should also be no heavy puddling in the intake, Have you checked the plugs too make sure there not foiling out, This also creats havick when trying to tune the idle.
Another thing you can do IF the IABs do not respond well, i had to do this on my PF, There are IFRs in the metering blocks, they should be screw-in bleeds, you can decrease that size by .003" on each (all 4). The carb can be tuned out for a clean idle without major headaches trust me, just some patiance & a general idea of what the engines telling you. BUT 1st. Make sure the plugs are fine & the PV/Bowl gaskets aren't leaking. DO NOT drill the butterflies just yet.
if you can tell me what IFR you have in your blocks now, maybe i could trade you if i have smaller ones. they are the brass jets near the top corners
Sixpack, Ill check. I wouldnt feel rght trading you as mine is a OLD QF and I dont have billet metering blocks.
Ill check it out though.
Kasey
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Re: Carb Tuneing
[Re: Moparnut426]
#1092761
10/12/11 05:08 PM
10/12/11 05:08 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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do you have a drill bit set to measure your IFR's? what size is the carb?
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Carb Tuneing
[Re: sixpackgut]
#1092763
10/12/11 05:42 PM
10/12/11 05:42 PM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
|
Quote:
do you have a drill bit set to measure your IFR's? what size is the carb?
The carb is a 950hp from what QF told me. It has a 850 base plate and a 750 main body. The base plate measures slightly smaller than what an 850 should, but a lot bigger than a 750 base plate. Like I said this carb has me all confused.
Ill take it back appart and measure the meetering blocks for you guys.
Kasey
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