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school me on air bleeds #2392021
10/23/17 08:41 PM
10/23/17 08:41 PM
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ohio
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dbran451 Offline OP
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I don't post much on here any more but I could use some advise. I am running e-85 with a 1050 dominator after up grading my ignition system (went from a 6al and a blaster coil to a digital 7 and a HVC2 coil)I developed a high speed lean out pop I have jetted up to 106 jets with some help and have started looking at the air bleeds it has 28 square now was thinking I would go to 25s how much will this fatten up on the high side any help will be appreciated

Re: school me on air bleeds [Re: dbran451] #2392026
10/23/17 09:06 PM
10/23/17 09:06 PM
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Oregon
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AndyF Offline
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Is the carb designed to use E85? If not then you might not be able to get any more fuel thru the metering blocks. There are passages behind the jets that flow fuel and if those aren't large enough then it doesn't matter how big of a jet you put in it.

If the carb is designed for E85 but it has a fuel curve issue then going smaller on the main air bleed will add fuel at WOT. Fuel curve engineering is best done on a dyno with wide bands hooked up.......

Re: school me on air bleeds [Re: AndyF] #2392032
10/23/17 09:19 PM
10/23/17 09:19 PM
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dbran451 Offline OP
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If the carb is designed for E85 but it has a fuel curve issue then going smaller on the main air bleed will add fuel at WOT. Fuel curve engineering is best done on a dyno with wide bands hooked up....... [/quote]

the carb has a quick fuel conversion with the green metering blocks I realize the best way is to use a dyno but that isn't in my future I'm just trying to get a feel for how much air bleeds will change the fuel curve

Re: school me on air bleeds [Re: dbran451] #2392072
10/23/17 10:27 PM
10/23/17 10:27 PM
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Bend,OR USA
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Cab_Burge Offline
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Try it and see scope
Let us, me, know your results please thumbs
I have a Holley 1150 converted to E85 by A.J. at Bob George racing that I'm racing with, I haven't tried changing any of the bleeds yet work
Mine has never miss do to fuel issues, yet luck
I did find out it, E85 fuel, doesn't like colder spark plugs shruggy work


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: school me on air bleeds [Re: dbran451] #2392073
10/23/17 10:29 PM
10/23/17 10:29 PM
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Mt. Vernon, Ohio
dartman366 Offline
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Originally Posted By dbran451


If the carb is designed for E85 but it has a fuel curve issue then going smaller on the main air bleed will add fuel at WOT. Fuel curve engineering is best done on a dyno with wide bands hooked up.......


the carb has a quick fuel conversion with the green metering blocks I realize the best way is to use a dyno but that isn't in my future I'm just trying to get a feel for how much air bleeds will change the fuel curve
[/quote]are those metering block's for the dominator or are they for the 4150 series, they look pretty much the same (green)and will interchange, but are not calibrated the same.


Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
Re: school me on air bleeds [Re: dbran451] #2392154
10/24/17 01:53 AM
10/24/17 01:53 AM
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Posts: 2,363
Cotati, CA
Dave Hall Offline
top fuel
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Check the plug gap! I went to that coil and gapped my plugs to the usual MSD .040 and that coil knocked that crap to well over .060. MSD recommends .020 with that coil, I wouldn't go over .025.

Re: school me on air bleeds [Re: Dave Hall] #2392231
10/24/17 10:37 AM
10/24/17 10:37 AM
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dbran451 Offline OP
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Originally Posted By Dave Hall
Check the plug gap! I went to that coil and gapped my plugs to the usual MSD .040 and that coil knocked that crap to well over .060. MSD recommends .020 with that coil, I
wouldn't go over .025.



the plugs were gaped at .040 but why would you close the gap when old coil fires at 140ma and the new one fires at 2a almost 2000 times stronger

Re: school me on air bleeds [Re: dbran451] #2392252
10/24/17 11:47 AM
10/24/17 11:47 AM
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northern,Ohio,USA
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Clanton Offline
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I was only able to change the a/f by 2pts going from a 60 to a 25 just to see what it would do.I needed to change the feeds to get real change but this was a 3 circuit.There are other things to test like putting a tube on the bowl vents,check fuel flow at top rpm...

Last edited by Clanton; 10/24/17 12:17 PM.

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Re: school me on air bleeds [Re: dbran451] #2392275
10/24/17 12:12 PM
10/24/17 12:12 PM
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Palm City, FL
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Dadodgekid Offline
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Friend of mine had the same problem, didnt chnage much but went too a digital 7 and the HVC 2 coil, he gapped his plugs too .040 and it starting breaking up at high RPM, we checked alot of little stuff... The Ign box, timing, pickup in the dizzy, turned out, when we gapped the plugs to .030 the issue went away. Only thing we could comeup with is that the larger bore size, 4.505, it was alot of windage in the combustion chamber blowing out the spark at 6500RPM plus. Hope this helps!

Re: school me on air bleeds [Re: dbran451] #2392336
10/24/17 02:04 PM
10/24/17 02:04 PM
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State of confusion
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Thumperdart Offline
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The smaller hi speed will delay the initial fuel down low and through the top end(richer) and a bigger hi speed will activate sooner (richer) and taper off up top (leaner). I had a scenario on my carb where it was stupid lean down low like 16-17 afr's and rich up top like in the 11's w/ .028's so I put .030's in and the curve teeter tottered rich down low and leaner up top just like that w/no other changes......EVERYTHING goes through the hi speed bleeds and they are active early in the run not just up top............. thumbs

Last edited by Thumperdart; 10/24/17 02:04 PM.

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.....
Re: school me on air bleeds [Re: dbran451] #2392339
10/24/17 02:15 PM
10/24/17 02:15 PM
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Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
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"school me on air bleeds"

From what I can figure out, the class lecture is only about 15 minutes long to cover the theory, but the lab work to test the theory vs reality can take years. eek

Re: school me on air bleeds [Re: BradH] #2392355
10/24/17 02:51 PM
10/24/17 02:51 PM
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Thumperdart Offline
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No chit.............


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Re: school me on air bleeds [Re: dbran451] #2392397
10/24/17 04:15 PM
10/24/17 04:15 PM
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Posts: 654
ohio
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dbran451 Offline OP
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from what I am reading I think I'll close the gap on the plugs and try that first the car was almost identical to the 330 ft. once it got into high gear and a load was on the motor did it pop







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