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89 Top Gun straight bottom

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Old 09-18-2017, 07:39 PM
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Cool 89 Top Gun straight bottom

Ok so after two seasons with the boat I finally have the injection pretty much dial in with a lot of help from the guys at Kinsler and KE, so here is it, 572 tall deck Chev's dart 320 heads, Kinsler/Lucas large throttle body mechanical injections aka, Mercury Racing late 80's early 90's, 720 lift, 2.3 intake 1.9 exhaust jesel solid roller, 9 to 1, dry sump, running 1.5 to 1 SSM #4's inch below bottom, B blades worked merc 16 5/8 29 4 blades, boat is good and dry, never left in the water its entire life, so far turned 5600, easy, what do you guys figure she ran with 1/4 tank and two people and what do ya think she is making for HP.

Last edited by Moxy; 09-18-2017 at 07:41 PM. Reason: more info
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Old 09-18-2017, 08:09 PM
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Would love to see some pictures!
ICDEDPPL and Biff like this.
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Old 09-18-2017, 08:14 PM
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No idea! But interesting recipe!
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Old 09-19-2017, 05:42 AM
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Speed?
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Old 09-19-2017, 10:16 AM
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88mph - making 800hp.
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Old 09-19-2017, 11:03 AM
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Must have missed that somehow lol
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Old 09-19-2017, 12:28 PM
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that boat was a time capsul. very very cool
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Old 09-19-2017, 12:57 PM
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My Guess is 750HP and I say 84GPS. I believe that the 89 guns did not have a transom notch.
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Old 09-19-2017, 01:18 PM
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89's are notched...........not that its going to make a huge difference speed wise.
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Old 09-19-2017, 01:34 PM
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My calculations and radar show 91 at 5600 RPM which by my and my friends calculation is 11-12% slip and it should require about 800-825 HP to move a big heavy flat bottom to 90 plus mph, and the 89 is a notched transom which in theory allows for higher X dimensions, now the props are actually 28 4 blades that Brett at B blades tells me measure 29 inches of pitch hence the post, not sure if his work added any pitch to the props, so there you have it pretty happy with the results, Engines should spin easily to 6K so gonna keep working on the injection to see where that leads.

Some pretty good guess's

Moxy

Last edited by Moxy; 09-19-2017 at 01:40 PM.
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