Valero YT Setback

Randy I have an 87 Valero YT with 2.5 efi 260.  I am interested in what set back and prop would be the best for this boat. I am presently running a 14.5 x 29 chopper with a 4 inch land and sea electric jack plus an additional 12 inches of setback. Boat runs in the nineties but you have to drive through some chine walk at about 85 mph.

Rob

 

Rob,
    Not to sound negative, but that 12" setback has got to go. I would imagine with that, that you have some bowlift to say the least. We did a boat for Jim Holman last year that had a slightly warmed up 2.5 200 carb. This boat had 7 1/2 inches of total setback. It ran a Bob's noseconed gearcase, one inch below the bottom and would turn the gaffrig over 90 mph. If you could get your boat to lay down, I have no doubt it would break 100. The long setback is requiring you to run the motor very high and the attitude of the boat the same way. This explains the midrange chine walk and I think that a lot more speed is there for the taking. I would try a set of 2 or 3" spacers on that Land and Sea jack. With a 260, you need to have the motor turning at least 7500 rpm. With you 29 inch prop, if you could run that rpm, you would be going way over 105 mph. This tells me that you are either slipping the prop at the height you need to run the jack with all that setback, or if you are hooked up, your rpm is way down. Ultimately, you will want to run a prop of 26 or so pitch. This should put you in the high 7000's and triple digits. I think this will give you a more consistent rig that will carry passengers faster than you can go alone now. Not to mention, your transom will thank you.

Randy

 

 

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Thanks,
Mark C.

 

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