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HP Dominator Idle
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Author:  Beretta [ Mon Jul 02, 2012 5:36 am ]
Post subject:  HP Dominator Idle

Having issues with this HP idling. Mark it will idle with the tune up you had gave me to start with but won't idle when in gear. I went with a larger IJ and IAB and got it to idle but it seems now it's rich so I am going to get it back to where it was originally and go from there again..
Now is the T-slot exposure the same as with gas? I would think so and this main body has some slot showing with the blades completely closed. I did drill holes in the blades and there .140 in all of them..
So any suggestions on where to go from here???

Author:  jmarkaudio [ Mon Jul 02, 2012 2:39 pm ]
Post subject:  Re: HP Dominator Idle

Go up .002 on the idle jet from your original calibration, and see if you can adjust the air bleeds up or down to get it in a usable range. .055 to .070 on the bleeds, if it's outside that go down on the IJ if you are above .070, up if you have to go below .055.

Author:  Beretta [ Wed Jul 04, 2012 8:41 am ]
Post subject:  Re: HP Dominator Idle

Anybody on the T=slot exposure question?? Im ready to fire it up as I made some changes we will se how it goes from here... :-k

Scott on your 1050 how big were the holes in you blades before it would idle where you wanted it.

Author:  jmarkaudio [ Wed Jul 04, 2012 10:19 am ]
Post subject:  Re: HP Dominator Idle

T-slots are no different than gas. I have not had to go more than 3/32 on the hole in the blades, and usually go smaller. .060 to .070 is a good place to start.

Author:  Beretta [ Wed Jul 04, 2012 7:10 pm ]
Post subject:  Re: HP Dominator Idle

Here's where Im at right now and it Idles at 1400 in park and drops to 1100 in gear..and is clean..
.047 IJ
.068 IAB
1/2 turn out on the mixture screws :-
And 2 full turns on the speed screws. I didn't get the carb off to see the T-slot exposure yet but I am sure it's more than square. And seeing my notes this is where it was on gas also as far as t-slot.

So with only a 1/2 turn out on the mixture screws I would guess I need a smaller IJ???

Author:  jmarkaudio [ Wed Jul 04, 2012 9:43 pm ]
Post subject:  Re: HP Dominator Idle

If your t-slots are exposed too much you are running rich on t-slot fuel, why the mixture screws are at 1/2 turn. Get them in the ballpark and then see where you are at with the mixture screws.

Author:  Beretta [ Thu Jul 05, 2012 4:56 am ]
Post subject:  Re: HP Dominator Idle

I can't close the blades any more and even tried a quarter turn and it would die. So your telling me I need more by pass air so I can close them more right?

Author:  Ken0069 [ Thu Jul 05, 2012 8:36 am ]
Post subject:  Re: HP Dominator Idle

Time to put the ball valve back in for more testing. ;-)

Author:  Beretta [ Sat Jul 07, 2012 8:22 am ]
Post subject:  Re: HP Dominator Idle

Here is a pic with the blades fully closed. I installed the ball valve and with it fully open that is somewhere about an 1/8 pipe fitting hole I can close the speed screws to a 1/2 turn. It will Idle but seems a little lean when dropped in gear...I am feeling like Ron here and almost ready to throw in the towel with this carb...This issue with the T-slot looks a lot like what Scott had with his and he started with .090 holes in all four blades.. I have .140 in them now and with out the ball valve the speed screws need to be at 2 full turns to get it to idle and like said it's now idling on the T-slot..So where from here.. :-
Image

Author:  Ken0069 [ Sat Jul 07, 2012 9:26 am ]
Post subject:  Re: HP Dominator Idle

Barry didn't you have this same problem when this carb was on gas? :-k

Author:  Beretta [ Sat Jul 07, 2012 10:41 am ]
Post subject:  Re: HP Dominator Idle

Ken0069 wrote:
Barry didn't you have this same problem when this carb was on gas? :-k


YES!!!!!!!!!!!!!!!!!!!!!!!
I just ran it as lean as I could running it at Idle on the T-slot...

Just had a brain storm :-# ..I know I did cause I have a headache #-o ..
Tell me why I can't just plug the t-slot holes and adjust/jet the idle with the speed screws set at a 1/2
turn?? This way I know for sure it will be idling on the idle jet or does it get some fuel from the T-slot at idle..Can't remember for sure..

And boy is it hot and humid today!!!!!!!! 94* with 70% humidity \:D/

Author:  Beretta [ Sun Jul 08, 2012 7:49 pm ]
Post subject:  Re: HP Dominator Idle

Some good news here now \:D/ \:D/ \:D/ after about 5 hours of changing just about everything there was to change as far as the idle circuit was concerned I got it..Can't remember how many times I took that carb off and puled it apart but here is where its at and runs as clean as can be..Now this is a 1250 HP body with a lot of T-slot showing and a big cam in a 540..
IAB-.059
IJ-.054
1 1/4 turns on the mixture screws
1/2 turn on the speed screws.(That was enough so they would not stick)
now here's the kicker O:) All 4 blades with a .195 hole in them...
And it Idles at 1400rpm and drops to 1100 to 1000 in gear and just sits there!!! \:D/ \:D/

I have to say I burned about 9 gallons of E85 to get it like it is and yea it was a PIA and hope if I have to do it again I can do it a lot quicker and with less thinking..Want to thank Bruce,Mark,Ken,AJ, for the talking on the phone and with some tips...Thanks guys!!!

Hope to get to the track Sunday to test and see how it runs down the 1/4.... ;-)

Author:  jmarkaudio [ Sun Jul 08, 2012 9:27 pm ]
Post subject:  Re: HP Dominator Idle

Those t-slots are a killer sometimes, glad it's working better now. Good Luck!

Author:  nomad [ Thu Jul 12, 2012 6:58 am ]
Post subject:  Re: HP Dominator Idle

Here's hoping it all comes together Sunday.

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