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07-01-2007, 02:34 PM
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#1
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Gold Member
 Gold Member
Join Date: Mar 2003
Location: wyandotte mi.
Posts: 2,194
1974 magnum sport 540 with a wicked scorpion racing engines tune up job...
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dominator on a 540
I have been having a hell of a time tuning my new mill....I have had people tell me pull the power valves and some say leave them in.................................Can someone please tell me what a na 540 9.5 to 1 comp, with a dominator braswell 1050 , where i should strart as far as power valves and jetting.........I tried to use the block offs and i am at 91 jets now and still to lean...........Help please..................
I am so close...........
__________________
IF YOU CAN TURN YOUR NOT GOING FAST ENOUGH!!!!!!
There's nothing harmonious or Zen-like about a Cigarette ride. It's an anarchic kind of rush—the nautical equivalent of Viagra.
still pouring hundies into this resin bucket................
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07-01-2007, 05:30 PM
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#2
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Registered
Join Date: Sep 2001
Location: Houston, TX, USA
Posts: 2,049
2003 Eliminator 30' Daytona
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Use a power valve. You can do a search on here for power valves & you might get some better ideas as to which one you will need to start with. I would start with a 4.5. A 4.5 will open when the manifold vacumm goes below 4.5"
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07-06-2007, 01:21 PM
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#3
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bcfountain
Gold Member
Join Date: Apr 2007
Location: prince george,va
Posts: 888
27fountain/04waverunner/10meter
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97 squared and #5 power valves is what i run on a 454w/blower.
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just because i dont care doesnt mean i dont understand.
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07-06-2007, 01:31 PM
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#4
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instigator
 Platinum Member
Join Date: May 2003
Location: Miami, Fla
Posts: 1,374
1980 Donzi Criterion 22
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first of all is this a 2 or 3 circuit Dommy?? marine specific carb??
muy' importante' question.....
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07-09-2007, 07:01 PM
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#5
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Gold Member
Gold Member
Join Date: Mar 2003
Location: wyandotte mi.
Posts: 2,194
1974 magnum sport 540 with a wicked scorpion racing engines tune up job...
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It is actually a brasswell, i am at the point i need a new baseline to start from........1050 need guys that run a 540 with big a cam good guts and great exhaust.........No power valves has been killing me i cant tune this bastard.......
HELP PLEASE, TYLER,TOMMY,JC,ANYBODY !!!!!!!!!!!!!!!!
__________________
IF YOU CAN TURN YOUR NOT GOING FAST ENOUGH!!!!!!
There's nothing harmonious or Zen-like about a Cigarette ride. It's an anarchic kind of rush—the nautical equivalent of Viagra.
still pouring hundies into this resin bucket................
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07-09-2007, 07:51 PM
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#6
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instigator
Platinum Member
Join Date: May 2003
Location: Miami, Fla
Posts: 1,374
1980 Donzi Criterion 22
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you didn't answer my question..
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07-10-2007, 10:24 AM
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#7
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Registered
Join Date: Jul 2002
Location: Waterford,MI
Posts: 2,782
94 43SC Black Thunder
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There are many different Dominators set ups. However most of them seem to come from Holley with square jetting at 90 and #6.5 power valves. Since you have 91's and no power valves, it would seem that you are lean. A power valve adds about 6 jet sizes. Teague, in one of his tech articles in Powerboat mag recommended a 8082-1 Holley 2 circuit 1050 with the addition of 2.5 power valves as a good carb for a high perf. 540. Mine has 92 jets and 3.5 power valves.
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07-10-2007, 10:29 AM
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#8
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instigator
Platinum Member
Join Date: May 2003
Location: Miami, Fla
Posts: 1,374
1980 Donzi Criterion 22
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Quote:
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Teague, in one of his tech articles in Powerboat mag recommended a 8082-1 Holley 2 circuit 1050 with the addition of 2.5 power valves as a good carb for a high perf. 540. Mine has 92 jets and 3.5 power valves.
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this is a very good suggestion, provided you have a TWO CIRCUIT Dommy. If you have a 3 circuit, you'll NEVER get it tuned right......
JH
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07-10-2007, 10:53 AM
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#9
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Platinum Member
Platinum Member
Join Date: Dec 2002
Location: Dallas, TX
Posts: 1,388
1987 Scarab Panther
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Mine is a Holley Dominator 1150 CFM #7320 (2-circuit) with 87 X 87 jets and 3.5 PV.
With a big cam, you may also need to reduce the idle air bleeds 3-5 sizes (richer) if a high idle setting in neutral is causing you are opening the throttle blades to the point of pulling fuel out of the transfer slots. A good indicator will be if the 4 corner idle screws are unresponsive.
I agree with the comments on a 3 circuit carb...sell it!
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07-10-2007, 01:51 PM
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#10
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Registered
Join Date: Jul 2002
Location: Waterford,MI
Posts: 2,782
94 43SC Black Thunder
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According to Teague, in the same tech tip, 3 circuit will always run too fat in the midrange.
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