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Dominator on the street, power valve or not

Posted By: galen

Dominator on the street, power valve or not - 01/03/10 12:56 AM

I am running 8896-2 on the street. 500' 440-3 intake. Idle and midrange runs eye burning rich. I am running a progressive linkage and front butterflies open 1/3 before the rears start to open. Carb originally came with 1 to 1 soft progressive.I am running a 4.5 power valve in the front. plug in the back. Found my number 1 & 2 spark plugs black, back six are brown. Idle screws all 4 are set for highest vac. Could using a power valve be causing this? I have an air bleed assortment but have not changed anything yet. Wide open jetting is close. Its idle to about 3500 thats rich. Timing is at 36, have tried it all over the place, it seems to like 36. I am running an aftermarket 10degree bushing in msd with light springs. Idle timing is 26. Galen
Posted By: torkrules

Re: Dominator on the street, power valve or not - 01/03/10 01:53 AM

Quote:

I am running 8896-2 on the street. 500' 440-3 intake. Idle and midrange runs eye burning rich. I am running a progressive linkage and front butterflies open 1/3 before the rears start to open. Carb originally came with 1 to 1 soft progressive.I am running a 4.5 power valve in the front. plug in the back. Found my number 1 & 2 spark plugs black, back six are brown. Idle screws all 4 are set for highest vac. Could using a power valve be causing this? I have an air bleed assortment but have not changed anything yet. Wide open jetting is close. Its idle to about 3500 thats rich. Timing is at 36, have tried it all over the place, it seems to like 36. I am running an aftermarket 10degree bushing in msd with light springs. Idle timing is 26. Galen



Ran the same carb on my old 496. I found that the transfer slots were feeding too much fuel. That's a 3 circuit carb so as soon as you get into cruising rpm the transition tubes start to feed fuel making it too rich. I drilled the transfer holes bigger in the main body and hammered in a brass air bleed and opened up the hole to about .082".

I ran a power valve. Since the carb has no vacuum port you will need to rig something up to read your idle/cruise vacuum and set up the power valve accordingly. I blocked the rear power valve off and jetted up accordingly.

Start with air bleeds up to stock to start. You may want to lean the idle and transition circuit slightly leaner.
Posted By: MR_P_BODY

Re: Dominator on the street, power valve or not - 01/03/10 01:54 AM

Whats your primary jetting
Posted By: moparniac

Re: Dominator on the street, power valve or not - 01/03/10 02:04 AM

I had BIGS dominator on my 500" challenger with the indy 440-3. ran great on the street! 4.5 power valve / jet extensions. I was pulling 9"'s of vac was 86f and 94r last pass at the track and was lean at 13.8 at WOT still... went 10.6 @ 128.3 on pump gas before the rain came

http://www.youtube.com/watch?v=gz-szQ1yrgY
Posted By: galen

Re: Dominator on the street, power valve or not - 01/03/10 02:06 AM

primary is 88 Mike
Posted By: MR_P_BODY

Re: Dominator on the street, power valve or not - 01/03/10 02:07 AM

Quote:

primary is 88 Mike



Thats pretty fat for having a PV
Posted By: galen

Re: Dominator on the street, power valve or not - 01/03/10 02:13 AM

Mike it came with 6.5s front and rear with 88 jets squared. Do the main jets effect the idle off idle mixture?
Posted By: MR_P_BODY

Re: Dominator on the street, power valve or not - 01/03/10 02:18 AM

Quote:

Mike it came with 6.5s front and rear with 88 jets squared. Do the main jets effect the idle off idle mixture?



My 8896 came with 88s squared and no PV... off idle
it starts on the mid
Posted By: Ari440

Re: Dominator on the street, power valve or not - 01/03/10 02:41 AM

my 8896 92-94 jets no p/v
Posted By: Leigh

Re: Dominator on the street, power valve or not - 01/03/10 03:04 AM

OEM jetting. Your's is oem jetting at 88 primary and secondary with P/Valves. Where does the -2 suffix come from? There isn't a part # on Holley or Summit site?

Attached File
Posted By: 65HemiCoronet

Re: Dominator on the street, power valve or not - 01/03/10 04:15 AM

Quote:

I am running 8896-2 on the street. 500' 440-3 intake. Idle and midrange runs eye burning rich. I am running a progressive linkage and front butterflies open 1/3 before the rears start to open. Carb originally came with 1 to 1 soft progressive.I am running a 4.5 power valve in the front. plug in the back. Found my number 1 & 2 spark plugs black, back six are brown. Idle screws all 4 are set for highest vac. Could using a power valve be causing this? I have an air bleed assortment but have not changed anything yet. Wide open jetting is close. Its idle to about 3500 thats rich. Timing is at 36, have tried it all over the place, it seems to like 36. I am running an aftermarket 10degree bushing in msd with light springs. Idle timing is 26. Galen


I'd be very interested in what others are running, as I have the same setup and results on my 528 hemi. Plugs are very black, almost wet running at cruising speeds. I put larger primary air jets in to try and help some. Haven't really looked at anything else yet. Am wondering if it would be just better throwing in the towel with the dominater and going to 1000 or 950 style 4150 carb?
Posted By: torkrules

Re: Dominator on the street, power valve or not - 01/03/10 02:24 PM

Quote:

my 8896 92-94 jets no p/v



I had mine down to 83 with the PV in the front and 88 or 90 in the rear with no PV. Mine came with 88 square and a powervalve. I thought that was too rich.
Posted By: ProSport

Re: Dominator on the street, power valve or not - 01/03/10 03:13 PM

I have a single 9375 1050 Dominator, jets are 96 squared with no power valve, but if I'm just cruising for a couple weeks without racing I throw a power valve in the front and jet the front down 8 numbers, makes it run MUCH smoother through 1st gear at slow speeds on the street.
Posted By: polyspheric

Re: Dominator on the street, power valve or not - 01/03/10 03:27 PM

1 irritating problem with 3 circuit carbs is that the point of tip-in for the intermediate is the position of the hole in the body vs. the sweep of the throttle disc (not RPM or vacuum). This means that different engines size, static CR, cams, plenum volumes etc. need not only a difference hole size, but the hole "bumped" a bit forward or back to change the throttle disc angle at which the hole is exposed to vacuum.
IMHO some have already done this, but are not telling.

If you examine a "suspect" carb, look for a partial bevel or flat spot on the disc's edge where it passes the holes...
Posted By: torkrules

Re: Dominator on the street, power valve or not - 01/03/10 03:52 PM

Quote:

OEM jetting. Your's is oem jetting at 88 primary and secondary with P/Valves. Where does the -2 suffix come from? There isn't a part # on Holley or Summit site?



Ran into the same problem with mine. No one could tell me what the -2 meant. It was stamped "HP" on the side.
Posted By: BIGS

Re: Dominator on the street, power valve or not - 01/03/10 05:23 PM

The great Dominator idle and part throttle rich condition....This is an issue no doubt....we started to adress this issue in 2002 when we started really seeing allot of big "race" type engines being used on the street....

We made several attempts in the early years to try and bandaid this problem with so-so results....and we have been constantly making advances since...

In 2007 we started working more with the 2 circuit theory that has been around for a long time but most didnt want to here about it because the "3 circuit" carb would make more power on the track....but remember were not talking 100% track cars here so if we gave up 10 HP somewhere and in trade gained a clean idle and cleaner cruise our customers would be happy with that.....

We seen instant results with our 2 circuit carbs and knew it was going to be a great carb for street cars that cruise allot....and since then we have have not only made a great cruising/idleing carb but we also have it worked into our race line-up and they run just as fast as the 3 circuit stuff we build and have a clean cruise up the return road and in the pits.....

So if you have an engine that needs the Dominator at wide open for Peak ET/HP you dont have to give up and go back to a 4150 to get a clean running carb....all the mods that you see other racers making to these carbs are on the correct path but it can make you pull your hair out.....

Jesse @ BIGS!!
Posted By: AndyF

Re: Dominator on the street, power valve or not - 01/03/10 05:31 PM

Quote:

I am running 8896-2 on the street. 500' 440-3 intake. Idle and midrange runs eye burning rich. I am running a progressive linkage and front butterflies open 1/3 before the rears start to open. Carb originally came with 1 to 1 soft progressive.I am running a 4.5 power valve in the front. plug in the back. Found my number 1 & 2 spark plugs black, back six are brown. Idle screws all 4 are set for highest vac. Could using a power valve be causing this? I have an air bleed assortment but have not changed anything yet. Wide open jetting is close. Its idle to about 3500 thats rich. Timing is at 36, have tried it all over the place, it seems to like 36. I am running an aftermarket 10degree bushing in msd with light springs. Idle timing is 26. Galen



Buy yourself some billet metering blocks so you can tune the carb. A Holley three circuit Dominator probably needs to have the intermediate circuit reduced by about 80% to run it on the street at part throttle. Get yourself a wide band setup so you know what your AF ratio is.

An 8896 is not designed to be a street carb. If you're going to try to run one on the street then you need to at least be prepared to completely retune the fuel circuits. You are trying to make that carb do something it wasn't designed to do.
Posted By: Thumperdart

Re: Dominator on the street, power valve or not - 01/03/10 06:39 PM

I`ve been street driving and racing my 8082-3 1050 for years and it has the best manners on the street w/a ft. pv in the 2.5-3.5 range jetted at 82 in the ft. and 90 in the rear. I have street driven it square jetted w/no pv and it was a bit rough down low but came alive when I nailed it.....not much fun and the plugs were hard to keep clean. I now race/drive w/a pv all of the time.
Posted By: MR_P_BODY

Re: Dominator on the street, power valve or not - 01/03/10 06:54 PM

Yeah the 8082-2 is a better dom for the street being
that its a 2 circuit carb
Posted By: galen

Re: Dominator on the street, power valve or not - 01/03/10 07:09 PM

Which 2 circuit would you recmmend for the street. I can have mine modified but by the time I buy metering blocks and boosters to try and make the 3 circuit run right, it may just be time to change carbs
Posted By: Thumperdart

Re: Dominator on the street, power valve or not - 01/03/10 07:13 PM

As I understand it, the 8082 models are a good choice or as you stated, maybe a modified/conversion of what you have.
Posted By: MR_P_BODY

Re: Dominator on the street, power valve or not - 01/03/10 07:21 PM

Quote:

Which 2 circuit would you recmmend for the street. I can have mine modified but by the time I buy metering blocks and boosters to try and make the 3 circuit run right, it may just be time to change carbs



I've heard of guys running the 8082 on the street and
it works just fine... just like Thumper
Posted By: Kelob_pie

Re: Dominator on the street, power valve or not - 01/04/10 12:09 AM

I have my 8082 and it works great on the street. Also, it has been converted for E85 use.
Posted By: MIKES_DUSTER

Re: Dominator on the street, power valve or not - 01/04/10 12:50 AM

NOT!!!!!
Posted By: 602heavy

Re: Dominator on the street, power valve or not - 01/04/10 01:35 AM

Guys that can run 3 circuits on the street with no fouling issues is amazing.

No way these out the box 3 circuits can run clean @ tip in , as soon as the throttle blades are cracked open fuel will pour in below the boosters , i'm gonna bet anyone running a 3 circuit out the box with no modifications to temporary block the intermediate tube with a tooth pick or similar & then post back hoe that little ole mod made the world of difference.
Posted By: torkrules

Re: Dominator on the street, power valve or not - 01/04/10 01:54 AM

Quote:

Guys that can run 3 circuits on the street with no fouling issues is amazing.

No way these out the box 3 circuits can run clean @ tip in , as soon as the throttle blades are cracked open fuel will pour in below the boosters , i'm gonna bet anyone running a 3 circuit out the box with no modifications to temporary block the intermediate tube with a tooth pick or similar & then post back hoe that little ole mod made the world of difference.



You are absolutely correct. I spent a month dialing mine in. Once I did the plugs were a nice tan brown. It was the best carb I ever owned. I restricted the transfer slots but you could probably do the same with the intermediate circuit. I also opened up the PV chanels so I didn't need as much primary jet, but this the jetting and PV sizing will depend on a lot of things (intake, cam, engine size, etc.)
Posted By: Damned67

Re: Dominator on the street, power valve or not - 01/04/10 02:09 AM

Quote:



Buy yourself some billet metering blocks so you can tune the carb. A Holley three circuit Dominator probably needs to have the intermediate circuit reduced by about 80% to run it on the street at part throttle. Get yourself a wide band setup so you know what your AF ratio is.

An 8896 is not designed to be a street carb. If you're going to try to run one on the street then you need to at least be prepared to completely retune the fuel circuits. You are trying to make that carb do something it wasn't designed to do.



What he said!
I struggled for what seemed like eternity with a massively rich off-idle condition in my 8896. I was working with a LM-1 unit and it was readiing as rich as 9:1.
Following some advice on the LM-1 forum, I purchased some Quickfuel (?) billet metering blocks. I simply installed them with a some fairly standard jetting (can't remember exactly what it was) and took it for a run to get a baseline for which to tune from. That was 6 months ago, the billet plates made so much differece that I haven't even bothered to go back and fine tune the carb.

I should add, the Quickfuel metering blocks came as a pair, with PV provision on the primary side and no provision for a PV on the secondary side.
Posted By: 602heavy

Re: Dominator on the street, power valve or not - 01/04/10 02:17 AM

Transition slot position can vary from carb to carb , some will set the throttle blades to just uncover the trans slot , this causes issues if that particular carb has the trans slot set higher up the throttle bores , all this does is pull fuel through the intermediate tube @ idle due to the throttle blade angle , some guys will set the idle speed & if it does'nt pull main metering they assume there good to go , forgeting it's dumping fuel through the intermediate tube.
Posted By: galen

Re: Dominator on the street, power valve or not - 01/04/10 03:19 AM

In theory could I plug off the transfer tubes in the main body and do away with the intermediate circuit? Could I then tune it like a 2 circuit?
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