|
|
 |
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
Please submit
whatever questions you have to IHRTechTalk@yahoo.com.
All questions and answers selected will be displayed on this page as they
come in. Note: though all boaters are welcome, priority may be given to
I.H.R.
members. Randy can not be held responsible for any advice
given. Though his information and expertise is second to none, he
has no control over what you do with your boat. It is up to you to
boat safely and act responsibly, and his advice is only to be used as a
guidance for your high performance boat/motor of which you are the one
responsible for the risks involved.
Thanks,
Mark C.
|
