Viper/Merc 150 Setup
Viper and a V6, hard project you have there. First thing get solid
mounts in the motor if you don't have them. Then get those batteries out
of the nose and leave one on shore. I'd get rid of the hydraulic plate as
it will cause you more problems than it's worth. Once you get the magic
height you don't need all the weight and set back. I'd run the motor
on a two and one half inch plate and adjust it so the propshaft is 2"
below the pad. If you keep the CMC then mark the plate when the motor has
the propshaft 1 and 3/4" below the pad. Slightly higher because of
the longer set back. For props I'd ditch the laser and buy one of the new
Hydromotive 4 blade TX-4 props. I just got 2 of them and ran them Friday
afternoon. They are very fast out of the box. Most importantly it is the
easiest driving prop I've driven. I ran one on my Allison 2002 at
114mph and they made a hard to drive 2003 Gransport Allison a nice boat
again. I'm not trying to sell props for Hydromotive, it's just that the
things work better that most any prop I've got in the last 5 years. On
your boat good handling would be a plus.
you set it up with the propshaft as noted and put the battery in the rear
on the port side, you should have a boat that will push 80. I'd get the 13
and 3/4 X26 prop like noted. The porpoise problem is a Viper thing. Hell,
they do that with 115's on them. Trim down during slowspeed maneuvers and
the boat will fly on the high speed runs. With the battery in the tail you
don't need to use all the trim the motor has. Just trim it till it picks
the nose up and just enough to keep it elevated. After you've mastered
that set up, you can go a little faster with a nosecone, some more height,
and some mild engine tuning tricks. For now learn to control the chine
walk as any fast v-bottom has this. The set up here should make it easier.
You will find that at the engine height noted you can do just about
anything with the boat. Pull skiers, go fast alone or with passengers. So
mark the jack plate in case anybody plays with the buttons. Keep it
simple, go fast and have fun.
me know how it goes.
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.
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