Scarab 29 with 500 EFI
06-26-2014, 09:02 PM
#11
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[QUOTE=hullofjustis;4144019]
I want to try a imco -2 inch next year.
What prop did you have at this time 4 blade or 5 blade?
And what drive ratio?
I have a 29 single with a 525sc and i was run 68-70 mph gps, now i have build the engine with Bob Madara custom grind roller cam, ported alluminium head, 8:1 comp ratio, 468 ci block, BM 250 blower, twin QFT 850 marine carb at 9-10 psi boost with water/methanol injection estimate at arond 800hp runing now 80 mph gps turning a BBlade 26p lab at 5700 rpm.
With std height bravo drive that the center of prop shaft is at 7,375'' below the bottom of the hull.
In 2-3 foot chop the boat start to chine walk.[/QUOTE
I HAD 825 HP 5900 -6000 RPM -1 IMCO LOWER AND HAD THE BOTTOM BLUE PRINTED AND DID NOT CHINE WALK AT ALL, YOU MAY WANT TO CONSIDER RAISING THE X DIMENSION OR BLUE PRINTING THE BOTTOM
With std height bravo drive that the center of prop shaft is at 7,375'' below the bottom of the hull.
In 2-3 foot chop the boat start to chine walk.[/QUOTE
I HAD 825 HP 5900 -6000 RPM -1 IMCO LOWER AND HAD THE BOTTOM BLUE PRINTED AND DID NOT CHINE WALK AT ALL, YOU MAY WANT TO CONSIDER RAISING THE X DIMENSION OR BLUE PRINTING THE BOTTOM
I want to try a imco -2 inch next year.
What prop did you have at this time 4 blade or 5 blade?
And what drive ratio?
Last edited by supermx96; 06-26-2014 at 09:11 PM.
06-27-2014, 06:53 AM
#12
I HAD A 26 4 BLADE BRAVO ONE 1.5 GEAR RATIO, NOW THAT I THINK ABOUT It I WAS USING 4.5LB BOOST ON THE DYNO and DROPPED TO 3LBS WHEN I PUT THE ENGINE IN THE BOAT. SO IT WAS PROBABLY ONLY MAKING 775HP. 7.375 below the bottom is really low but normal for a boat built then. you may even consider putting a -3 imco on or an imco extension box if you are looking for top speed. prop shaft i do not recall where that was on my 29.single, i have my twin engine scarab panther setup to be 3 1/4 below the bottom with std. length bravo and 1 1/4 below with shorties.
06-27-2014, 08:12 AM
#14
neutral trim. or propshaft at the same angle as the hull. tak a straight rule hold it next t the bottom (lowest point) of hull and put the propshaft at that same angle and drop a tape measure from rule to propshaft center
-------------- like that top line is lowest point of v on a single engine lower line is propshaft
-------
you can measure one hull and put the identicl boat next to it and it more than likely will be different .propshaft height that is
-------------- like that top line is lowest point of v on a single engine lower line is propshaft
-------
you can measure one hull and put the identicl boat next to it and it more than likely will be different .propshaft height that is
Last edited by hullofjustis; 06-27-2014 at 08:18 AM.
08-14-2014, 05:08 PM
#19
you stated a 25 pitch bravo one i have only ever seen even number bravo one props.
