King Demon Jetting
07-23-2009 | 08:21 AM
#1
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From: Ludington, Mi.
King Demon Jetting
1997 31 Awesome, #5's w/Bam's spinning 17.5 x 31's
572, AFR Heads, Dry Stellings, mystery Crane Hyd cam, 32 deg timing, MSD, Blower motors w/blower removed and King Demon box carbs installed
Barry Grant King Demon 1090 straight discharge, 6.5 power valve 94 mains all around.....
I know what I should do.... send to Nickerson.....BUT I just want to get by for the summer , only about 6wks
left for us Mi people. Then I plan I putting my proven Procharger setup on this winter. I bought the boat this way and have yet to get on plane... acts lean... runs rich fouls plugs, won't spin past 2000rpm trying to get on plane.
Just looking for baseline...
My eyes are blood red from reading all night.....Ok all that said....
Should I be running power valves? Brass plug???
Jetting recommendations? run square???
Any other ideas?
572, AFR Heads, Dry Stellings, mystery Crane Hyd cam, 32 deg timing, MSD, Blower motors w/blower removed and King Demon box carbs installed
Barry Grant King Demon 1090 straight discharge, 6.5 power valve 94 mains all around.....
I know what I should do.... send to Nickerson.....BUT I just want to get by for the summer , only about 6wks
left for us Mi people. Then I plan I putting my proven Procharger setup on this winter. I bought the boat this way and have yet to get on plane... acts lean... runs rich fouls plugs, won't spin past 2000rpm trying to get on plane.
Just looking for baseline...
My eyes are blood red from reading all night.....Ok all that said....
Should I be running power valves? Brass plug???
Jetting recommendations? run square???
Any other ideas?
07-23-2009 | 10:46 AM
#3
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From: Ludington, Mi.
Nope they are smaller, w/blowers they spun 34's. Supposedly they (seller) ran 110 w/this setup...... not working for me.
07-23-2009 | 11:02 AM
#4
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From: Lake St. Clair
That's what I'm wondering, did they actually run it that way, or was that an estimate what it might run? I know it takes close to 700hp to run 110 in that hull ,
07-23-2009 | 12:12 PM
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From: Cincinnati, Ohio
Depends on the gear ratio, do you know what it is? My guess is there is just not enough low end power. Air tubes on the drives may help but are not desirable.
Do the props blow out when coming on plain or does the motors just bog down?
Borrow some smaller props.
Are both motors doing exactly the same thing?
IMO 94s all the way around are to big, but it should still get on plain.
IMO yes on the power valves. If you do not run them the jetting needs to be increased. No real reason in your case not to run them.
I would like to see pics of the stellings in the boat.
Also where is the prop shaft realative to the bottom of the hull? May not be relative to the problem but I am wondering.
Do the props blow out when coming on plain or does the motors just bog down?
Borrow some smaller props.
Are both motors doing exactly the same thing?
IMO 94s all the way around are to big, but it should still get on plain.
IMO yes on the power valves. If you do not run them the jetting needs to be increased. No real reason in your case not to run them.
I would like to see pics of the stellings in the boat.
Also where is the prop shaft realative to the bottom of the hull? May not be relative to the problem but I am wondering.
Last edited by tssteph; 07-23-2009 at 12:20 PM.
07-23-2009 | 01:44 PM
#6
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From: Ludington, Mi.
07-23-2009 | 01:53 PM
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From: Cincinnati, Ohio
You are right 2500 rpm should be close to rolling over. Once on plane I can cruise at 2000 rpm if I need to.
Based on his description it sounds like they are hooked up and the motors won't go over 2k rpm.
5s would be high and I would think blow out would be more likely.
Based on his description it sounds like they are hooked up and the motors won't go over 2k rpm.
5s would be high and I would think blow out would be more likely.
07-23-2009 | 01:56 PM
#9
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From: Ludington, Mi.
Depends on the gear ratio, do you know what it is? My guess is there is just not enough low end power. Air tubes on the drives may help but are not desirable.
Do the props blow out when coming on plain or does the motors just bog down? motors just bogg... it's a carb issue I thought possibly to big??
Borrow some smaller props.
Are both motors doing exactly the same thing? YES
IMO 94s all the way around are to big, but it should still get on plain. from all my reading when running power valves I should be several sizes down on primaries. also I need to do a vacuum reading to figure out correct P/V's
IMO yes on the power valves. If you do not run them the jetting needs to be increased. No real reason in your case not to run them.
I would like to see pics of the stellings in the boat. I would but membership has expired
Also where is the prop shaft relative to the bottom of the hull? May not be relative to the problem but I am wondering.
Do the props blow out when coming on plain or does the motors just bog down? motors just bogg... it's a carb issue I thought possibly to big??
Borrow some smaller props.
Are both motors doing exactly the same thing? YES
IMO 94s all the way around are to big, but it should still get on plain. from all my reading when running power valves I should be several sizes down on primaries. also I need to do a vacuum reading to figure out correct P/V's
IMO yes on the power valves. If you do not run them the jetting needs to be increased. No real reason in your case not to run them.
I would like to see pics of the stellings in the boat. I would but membership has expired
Also where is the prop shaft relative to the bottom of the hull? May not be relative to the problem but I am wondering.
07-23-2009 | 03:52 PM
#10
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From: Cincinnati, Ohio
If you ease into the throttle and get it rolling does it still just bogg? I wonder if trimming it up a little might help get the rpms up? Is the boat real nose high and just plowing? Mine does not go nose high and plw at all.
http://www.youtube.com/watch?v=Vw5Zt...&feature=email
http://www.youtube.com/watch?v=Vw5Zt...&feature=email
