Idle issue with 1000cfm 4150 carb
#1804377
04/15/15 07:27 PM
04/15/15 07:27 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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I have a pro systems 1000cfm 4150 carb basically is a worked holley hp style carb. The motor is a small block mopar 408 stroker, big solid roller camshaft with Indy 360-1 cnc heads and runs on pump gas. The truck doesn't want to idle on first fire up when engine cold. I have to keep it running with my foot for about the first minute of run time. Then it will idle but kinda low till it warms up then the idle rpm is about 1,100 in park. It is really fat at idle also. I don't remember what size my air bleeds are and will get that info when I get home. I do know the idle mixture screws are at 1 1/2 turns out. The cruise throttle and WOT are perfect and no issues there. I also know it ran best with a 6.5 power valve, had a 4.5 in it and it didn't like it. Rear power valve is blocked and jett spread is 84 front 94 rear. I just went through and cleaned the carb month ago before I put the motor together and have since blown out the air bleeds again to make sure they weren't plugged. I have always had this issue with this carb even with my old set-up with ported eddy heads and a .630" lift solid roller. I haven't put a wideband on it yet but I will be shortly and I also run #8 ngk race plugs as this is a nitrous motor.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: Quicktree]
#1804393
04/15/15 07:55 PM
04/15/15 07:55 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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36*, also did it on old set-up at 38* I'm thinking one issue is I need to have it idle at 1,200-1,300 due to lack of low speed signal with the bigger venturi size.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804398
04/15/15 08:02 PM
04/15/15 08:02 PM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,470
Sydney,Australia
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i have 1 of those carbs on my 440 . Yep 2 half pumps and will normally fire up dead cold - but will have to hold idle to 900/1000 for about a minute , then will idle roughly till about 130deg eng temp .Will occasionally stall when air is cold when I have backed out of garage and then let idle .By the way mine idles around 900/950 in neutral great carb though
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Idle issue with 1000cfm 4150 carb
[Re: tex013]
#1804404
04/15/15 08:18 PM
04/15/15 08:18 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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i have 1 of those carbs on my 440 . Yep 2 half pumps and will normally fire up dead cold - but will have to hold idle to 900/1000 for about a minute , then will idle roughly till about 130deg eng temp .Will occasionally stall when air is cold when I have backed out of garage and then let idle .By the way mine idles around 900/950 in neutral great carb though
Tex Mine is JUST LIKE THIS! LOL! but I agree I dropped three tetnhs on my old set-up when I went from a 950 ultra hp to this pro systems 1000 carb doing nothing else.I do really like this carb and if i can figure out this idle issue it will be that much sweeter
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804415
04/15/15 08:39 PM
04/15/15 08:39 PM
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Joined: May 2004
Posts: 12,414 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
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Taxes & Virus's R-US, NY
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Couple of things. I have one of those carbs, but its on a bigger engine, so you will have to bare with me.
Assuming you checked for vacuum leaks, and you obviously know your total timing, what is your idle timing at? Higher idle timing will drastically improve signal to the carb. I recommend 22-23° at idle if you can dial that in.
Two, #69 idle air bleeds and one turn out on the idle screws will get you more fuel. I run either #69 or #70 on all my Mopars....They like fuel at idle. Stock is #76....Too lean.
PS...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. I also went with out any power valves and square 94 jetting and got my idle better by 200rpm.....They say that means I have a vacuum leak, but I looked many times and could not find one. The car has gone 6.13 in the 1/8th geared for the 1/4 so far. I went with #28 HS bleeds from the #34's that it came with as well, but my engine is bigger...
Two people have made me multiple offers on that carb....Kinda weird cause I really don't want to sell it I picked up almost a full 1/10 in just the 60ft from a 1.40 to a 1.326 with mine.....deadly consistent.
Last edited by Dragula; 04/15/15 08:48 PM.
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Re: Idle issue with 1000cfm 4150 carb
[Re: Dragula]
#1804418
04/15/15 08:53 PM
04/15/15 08:53 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
|
Couple of things. I have one of those carbs, but its on a bigger engine, so you will have to bare with me.
Assuming you checked for vacuum leaks, and you obviously know your total timing, what is your idle timing at? Higher idle timing will drastically improve signal to the carb. I recommend 22-23° at idle if you can dial that in.
Two, #69 idle air bleeds and one turn out on the idle screws will get you more fuel. I run either #69 or #70 on all my Mopars....They like fuel at idle. Stock is #76....Too lean.
PS...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. I also went with out any power valves and square 94 jetting and got my idle better by 200rpm.....They say that means I have a vacuum leak, but I looked many times and could not find one. The car has gone 6.13 in the 1/8th geared for the 1/4 so far. I went with #28 HS bleeds from the #34's that it came with as well, but my engine is bigger...
Two people have made me multiple offers on that carb....Kinda weird cause I really don't want to sell it I picked up almost a full 1/10 in just the 60ft from a 1.40 to a 1.326 with mine.....deadly consistent.
Timing is locked out at 36*, I have checked for vacuum leaks and have none, I also have new carb gaskets and new nitrous plate and solenoids(Indutction Solutions sledgehammer plate) that were all sealed with liquid teflon sealer. I will check what my air bleeds are and let you know but I might try your suggestions after I get my wideband gauge on it.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804482
04/15/15 10:23 PM
04/15/15 10:23 PM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,470
Sydney,Australia
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Yes , mine picked up over a BG825 mighty demon,20+RWHP. But street driving the 825 was nicer when cold , cleared the cold stumble off idle earlier . I have , like you , put it down to big carb/venturi on a single plane intake . Was the same with a M1 and the current Victor . A friends 440 with a 1050 Dom is similar . You can hear when pulling away cold there is a stumble till it gets a bit more air speed - fine when warm . Keep with it ,Patrick said to me next carb will be a Dominator Tex
Last edited by tex013; 04/15/15 10:24 PM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804500
04/15/15 10:56 PM
04/15/15 10:56 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
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Yes my carb was built for my old set-up then sent back to him for my new set-up and still does the same thing. Dealing with Patrick has been a pain for me as it is always"send it back to me and I will fix it" well that sucks. I will just try to fix it myself or deal with it till race season is over then i will send it in to him as I'm tired of waiting and paying shipping costs for an issue that has yet to be fixed!
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804510
04/15/15 11:02 PM
04/15/15 11:02 PM
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Joined: May 2004
Posts: 12,414 Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,414
Taxes & Virus's R-US, NY
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Couple of things. I have one of those carbs, but its on a bigger engine, so you will have to bare with me.
Assuming you checked for vacuum leaks, and you obviously know your total timing, what is your idle timing at? Higher idle timing will drastically improve signal to the carb. I recommend 22-23° at idle if you can dial that in.
Two, #69 idle air bleeds and one turn out on the idle screws will get you more fuel. I run either #69 or #70 on all my Mopars....They like fuel at idle. Stock is #76....Too lean.
PS...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. I also went with out any power valves and square 94 jetting and got my idle better by 200rpm.....They say that means I have a vacuum leak, but I looked many times and could not find one. The car has gone 6.13 in the 1/8th geared for the 1/4 so far. I went with #28 HS bleeds from the #34's that it came with as well, but my engine is bigger...
Two people have made me multiple offers on that carb....Kinda weird cause I really don't want to sell it I picked up almost a full 1/10 in just the 60ft from a 1.40 to a 1.326 with mine.....deadly consistent.
Timing is locked out at 36*, I have checked for vacuum leaks and have none, I also have new carb gaskets and new nitrous plate and solenoids(Indutction Solutions sledgehammer plate) that were all sealed with liquid teflon sealer. I will check what my air bleeds are and let you know but I might try your suggestions after I get my wideband gauge on it. Correction, I went with #27HS bleeds.......and 94 jets in all four corners. Mine also has the 50cc accel pumps on it instead of 30cc pumps...That is why the 60ft improved.
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Re: Idle issue with 1000cfm 4150 carb
[Re: Dragula]
#1804512
04/15/15 11:04 PM
04/15/15 11:04 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
|
OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
|
Couple of things. I have one of those carbs, but its on a bigger engine, so you will have to bare with me.
Assuming you checked for vacuum leaks, and you obviously know your total timing, what is your idle timing at? Higher idle timing will drastically improve signal to the carb. I recommend 22-23° at idle if you can dial that in.
Two, #69 idle air bleeds and one turn out on the idle screws will get you more fuel. I run either #69 or #70 on all my Mopars....They like fuel at idle. Stock is #76....Too lean.
PS...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. I also went with out any power valves and square 94 jetting and got my idle better by 200rpm.....They say that means I have a vacuum leak, but I looked many times and could not find one. The car has gone 6.13 in the 1/8th geared for the 1/4 so far. I went with #28 HS bleeds from the #34's that it came with as well, but my engine is bigger...
Two people have made me multiple offers on that carb....Kinda weird cause I really don't want to sell it I picked up almost a full 1/10 in just the 60ft from a 1.40 to a 1.326 with mine.....deadly consistent.
Timing is locked out at 36*, I have checked for vacuum leaks and have none, I also have new carb gaskets and new nitrous plate and solenoids(Indutction Solutions sledgehammer plate) that were all sealed with liquid teflon sealer. I will check what my air bleeds are and let you know but I might try your suggestions after I get my wideband gauge on it. Correction, I went with #27HS bleeds.......and 94 jets in all four corners. Mine also has the 50cc accel pumps on it instead of 30cc pumps...That is why the 60ft improved. Mine also has dual 50cc pumps on it, I'm really thinking about going no power valve in front and square 94 jets on mine aswell.
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804522
04/15/15 11:16 PM
04/15/15 11:16 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Couple of things. I have one of those carbs, but its on a bigger engine, so you will have to bare with me.
Assuming you checked for vacuum leaks, and you obviously know your total timing, what is your idle timing at? Higher idle timing will drastically improve signal to the carb. I recommend 22-23° at idle if you can dial that in.
Two, #69 idle air bleeds and one turn out on the idle screws will get you more fuel. I run either #69 or #70 on all my Mopars....They like fuel at idle. Stock is #76....Too lean.
PS...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. I also went with out any power valves and square 94 jetting and got my idle better by 200rpm.....They say that means I have a vacuum leak, but I looked many times and could not find one. The car has gone 6.13 in the 1/8th geared for the 1/4 so far. I went with #28 HS bleeds from the #34's that it came with as well, but my engine is bigger...
Two people have made me multiple offers on that carb....Kinda weird cause I really don't want to sell it I picked up almost a full 1/10 in just the 60ft from a 1.40 to a 1.326 with mine.....deadly consistent.
Timing is locked out at 36*, I have checked for vacuum leaks and have none, I also have new carb gaskets and new nitrous plate and solenoids(Indutction Solutions sledgehammer plate) that were all sealed with liquid teflon sealer. I will check what my air bleeds are and let you know but I might try your suggestions after I get my wideband gauge on it. Correction, I went with #27HS bleeds.......and 94 jets in all four corners. Mine also has the 50cc accel pumps on it instead of 30cc pumps...That is why the 60ft improved. Mine also has dual 50cc pumps on it, I'm really thinking about going no power valve in front and square 94 jets on mine aswell. thats what I would do, and check the transition slots like mentioned above
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Re: Idle issue with 1000cfm 4150 carb
[Re: Quicktree]
#1804545
04/15/15 11:36 PM
04/15/15 11:36 PM
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Joined: Nov 2006
Posts: 733 jacksonville,FLORIDA
slammedR/T
OP
super stock
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OP
super stock
Joined: Nov 2006
Posts: 733
jacksonville,FLORIDA
|
thats what I would do, and check the transition slots like mentioned above what should they be at? .040" exposed?
2000 Dakota R/T, 408 magnum, 727, Indy heads 1000cfm 4150 carb, 93 octane fuel. motor; 10.258 @ 132.78 200 shot; 9.262 @ 144.69 racemagnum
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Re: Idle issue with 1000cfm 4150 carb
[Re: Dragula]
#1804834
04/16/15 11:12 AM
04/16/15 11:12 AM
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Joined: Aug 2006
Posts: 610 long time lurker, short time p...
PorkyPig
mopar
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mopar
Joined: Aug 2006
Posts: 610
long time lurker, short time p...
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...That is the best performing carb I have ever had once I thru out all the jetting it came with and started over. Doesn't say much for the company you got it from, if it was supposed to have been tuned for your car when you got it.
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Re: Idle issue with 1000cfm 4150 carb
[Re: slammedR/T]
#1804874
04/16/15 12:24 PM
04/16/15 12:24 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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thats what I would do, and check the transition slots like mentioned above what should they be at? .040" exposed? I start with about .020 .030 or square and go from there. If that has the 5 e holes with one plugged it's already jacked there plus the 45 squirters and on and on. Good carbs with the wrong peeps tunin em.
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: Idle issue with 1000cfm 4150 carb
[Re: Thumperdart]
#1804908
04/16/15 01:22 PM
04/16/15 01:22 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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thats what I would do, and check the transition slots like mentioned above what should they be at? .040" exposed? I start with about .020 .030 or square and go from there. If that has the 5 e holes with one plugged it's already jacked there plus the 45 squirters and on and on. Good carbs with the wrong peeps tunin em. I agree, i also open the rear blades a little if I need more.
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Re: Idle issue with 1000cfm 4150 carb
[Re: Quicktree]
#1804911
04/16/15 01:28 PM
04/16/15 01:28 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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thats what I would do, and check the transition slots like mentioned above what should they be at? .040" exposed? I start with about .020 .030 or square and go from there. If that has the 5 e holes with one plugged it's already jacked there plus the 45 squirters and on and on. Good carbs with the wrong peeps tunin em. I agree, i also open the rear blades a little if I need more. That can work but can also make idle and cruise 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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