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Re: Dominator tunning
[Re: Quicktree]
#464448
09/11/09 09:01 PM
09/11/09 09:01 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
wont swapping the intermediate and idle bleeds change the idle mixture?
This is the whole point of swapping the bleeds over , the intermediate air bleed will now be the idle air bleed when you swap the 3 circuit blocks for the two circuit.
Down sizing main jets to cope with a rich part throttle (intermediate) will hurt the performance higher in the RPM range , if the motor runs rich @ part throttle duie to the intermediate circuit then ditch it , there's certain applications whereby a 3 circuit would be beneficial , most on here don't fall in that catogory.
The intermediate circuit will flow fuel well before main metering , going smaller on MJs will help regards part throttle stumbles but in no way will it clean it up , i'd rather have clean plugs on the start of the run @ clean plugs when pulling into the pits , the 3 circuit won't allow this.
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Re: Dominator tunning
[Re: 602heavy]
#464450
09/11/09 09:03 PM
09/11/09 09:03 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
Quote:
wont swapping the intermediate and idle bleeds change the idle mixture?
This is the whole point of swapping the bleeds over , the intermediate air bleed will now be the idle air bleed when you swap the 3 circuit blocks for the two circuit.
Down sizing main jets to cope with a rich part throttle (intermediate) will hurt the performance higher in the RPM range , if the motor runs rich @ part throttle duie to the intermediate circuit then ditch it , there's certain applications whereby a 3 circuit would be beneficial , most on here don't fall in that catogory.
The intermediate circuit will flow fuel well before main metering , going smaller on MJs will help regards part throttle stumbles but in no way will it clean it up , i'd rather have clean plugs on the start of the run @ clean plugs when pulling into the pits , the 3 circuit won't allow this.
I will try it tomorrow, didn't have time today.
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Re: Dominator tunning
[Re: Quicktree]
#464451
09/11/09 09:08 PM
09/11/09 09:08 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
Quote:
Quote:
wont swapping the intermediate and idle bleeds change the idle mixture?
This is the whole point of swapping the bleeds over , the intermediate air bleed will now be the idle air bleed when you swap the 3 circuit blocks for the two circuit.
Down sizing main jets to cope with a rich part throttle (intermediate) will hurt the performance higher in the RPM range , if the motor runs rich @ part throttle duie to the intermediate circuit then ditch it , there's certain applications whereby a 3 circuit would be beneficial , most on here don't fall in that catogory.
The intermediate circuit will flow fuel well before main metering , going smaller on MJs will help regards part throttle stumbles but in no way will it clean it up , i'd rather have clean plugs on the start of the run @ clean plugs when pulling into the pits , the 3 circuit won't allow this.
I will try it tomorrow, didn't have time today.
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Re: Dominator tunning
[Re: 602heavy]
#464452
09/11/09 09:25 PM
09/11/09 09:25 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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The intermediate circuit is very rich on those carbs at part throttle. Also the float level is pretty sensitive on those carbs. Adjust it low on the sight glass hole, like normal carb then run it down another 1/2 turn. I drilled out the main body on those carbs before you could get these fancy metering blocks, and installed air bleed size jets...Pretty simple...Plenty of meat there. I measure the head of the bleed and used another bit slightlt larger in OD to counter sink the jet/bleed. IMO cutting it down about .015-.018 makes a world of diff. I also opened the idle air bleeds up .008-.010. I ran these carbs (three diff 8896's) this way, and always ran great, and performed perfect at any throttle position. Your right in the ball park with 93-93 jets squared up. Both of these carbs came from the box with 88 jets and 5.5 Power valves. I have run them with and with out the power valve jetting accordingly, no difference at all with the above said mods. 
Last edited by Bob_Coomer; 09/11/09 09:26 PM.
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Dominator tunning
[Re: Bob_Coomer]
#464453
09/11/09 09:59 PM
09/11/09 09:59 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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I ran the 8896 hp with the intermediate circuit blocked off , problem was it would'nt fatten up over 94/96 jets , as most will know the idle well won't flow much over this jet size in any case , the intermediate circuit is equivalant to around 8 jets sizes , my understanding is if you restrict the intermediate circuit you add to the lean issues @ full throttle , this is the reason i went the 2 circuit route & modified the fuel/emulsion circuits , picked up some & made power up to a 100 MJ , adding a PV to the 3 circuit blocks won't help regards fattening it up when jetting over 96 , the main well just won't flow enough fuel out the box.
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Re: Dominator tunning
[Re: 602heavy]
#464454
09/11/09 10:28 PM
09/11/09 10:28 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Quote:
I ran the 8896 hp with the intermediate circuit blocked off , problem was it would'nt fatten up over 94/96 jets , as most will know the idle well won't flow much over this jet size in any case , the intermediate circuit is equivalant to around 8 jets sizes , my understanding is if you restrict the intermediate circuit you add to the lean issues @ full throttle , this is the reason i went the 2 circuit route & modified the fuel/emulsion circuits , picked up some & made power up to a 100 MJ , adding a PV to the 3 circuit blocks won't help regards fattening it up when jetting over 96 , the main well just won't flow enough fuel out the box.
If you decided to not run the intem circuit, why not just buy a two circuir dominator?
No wonder it was lean at WOT blocking off the Intem circuit.
Loosing the PV helps the ease of tuning, your removing variables to deal with over all IMO.
The box stock Dominators make good power right out of the box, with just minor jet changes, I have seen these carbs out perform those fancy so called $1200-$1400 Pro Raced preped carbs...The owners/buys feel like tools when they take off there fancy carbs, bolt on the shop Holley HP, and make just as much, and sometimes substantially more power than those high dollar jewels...LOL
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Dominator tunning
[Re: sixpackgut]
#464455
09/12/09 08:13 AM
09/12/09 08:13 AM
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Joined: Mar 2008
Posts: 292
NY
challenger451ci
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 292
NY
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Quote:
removing the intermediate bleed completely will lean it out.
Tony, i looked at the brown cams i have and none will fit a dom without being made to fit
Quick Fuel told me to take them right out and see what happens. This will be my next step today if it's not raining....
I don't think it will be enough, so I'm trying to plan my next step. Maybe I'll just keep going smaller on the high speed bleeds to try to fatten up the full throttle without adding main jet.
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Re: Dominator tunning
[Re: Bob_Coomer]
#464458
09/12/09 05:51 PM
09/12/09 05:51 PM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
Joined: Dec 2008
Posts: 1,200
UK
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Quote:
Quote:
I ran the 8896 hp with the intermediate circuit blocked off , problem was it would'nt fatten up over 94/96 jets , as most will know the idle well won't flow much over this jet size in any case , the intermediate circuit is equivalant to around 8 jets sizes , my understanding is if you restrict the intermediate circuit you add to the lean issues @ full throttle , this is the reason i went the 2 circuit route & modified the fuel/emulsion circuits , picked up some & made power up to a 100 MJ , adding a PV to the 3 circuit blocks won't help regards fattening it up when jetting over 96 , the main well just won't flow enough fuel out the box.
If you decided to not run the intem circuit, why not just buy a two circuir dominator?
No wonder it was lean at WOT blocking off the Intem circuit.
Loosing the PV helps the ease of tuning, your removing variables to deal with over all IMO.
Why spend the extra $$$$ on a 2 circuit when i had the 3 circuit to begin with? , i run a front PV on the street & remove @ the track for obvious reasons.
We all have different opinions on this which is a good thing.
If you remove the intermediate air bleed you may just as well block the intermediate cuircuit all together , if you run a big inch motor the 3 circuit blocks won't flow enough fuel as you've just jetted down 8 sizes by removing Intermediate bleeds , the 2 circuit mod works for me as i run a 605" motor which needs well over a 96 MJ.
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Re: Dominator tunning
[Re: 602heavy]
#464459
09/12/09 06:15 PM
09/12/09 06:15 PM
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
blownzoom440
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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i wanted to sq jet my 1250 dom and it came with 100# and a 6.5 PV  to sq jet i doont think a 110 would be right for it.any ideas on what to go with? holley 80532=1
Last edited by METAL STORM; 09/12/09 06:17 PM.
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