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HST Setup
I
just bought a 91 HST with a 1996 Mercury 2.5 Drag. The boat is
beautiful and was raced in
Wichita
Kansas
back in the early 90's. It has a blueprinted bottom and rails along
the tunnels that go forward about 48"'s. It has a standard
non-adjustable 6" setback and then a hydraulic 5" jackplate.
The engine is in great shape and I had CDI electronics rebuild the
ECU module and install an off shore chip instead of Drag? Good or bad. I
also replaced voltage regulator and stator with aftermarket parts. I
think the engine cranks out around 280? The lower unit is stock
factory w/ low water pickup and large V-6 gear case. I have an
assortment of props, 24p chopper, 30p chopper, 27p cleaver and a 27p 4
blade pass thru
michigan
wheel rapture. The boat loves the 24p and it is very quick, but
blows out at the hole shot. Also after reading your articles on
drive height, I think I've been running to high. I seem to have in
excess of 20% slip from info with the calculators. I was turning
7200 rpm and going about 70 mph w/ 420 lbs of passengers (Dad and I).
I then went to the 30p chopper and this was today, I was turning 5800rpm
and going 68mph by myself, I think better. The rooster tail is
probably 150 yds long-bad? He keeps telling me to trim it out,
but I think that I'm not accomplishing anything by this. The 30p
chopper is better out of the hole, but still spins out. Once it
hooks up the acceleration is good, but not as quick as the 24p. Have
you ever ran a cleaver on this boat? I need to take this one in the
have a machine shop turn the hub on a lathe to make it work, is it worth
it or stick with the choppers. The
michigan
wheel has no hole shot which I thought was weird, that engine should turn
it, and the boat started to chine walk around 65, this never happens with
the chopper. Any info on how this boat handles and gear case height
would be appreciated. I've enjoyed ready all your articles posted.
Also, any way to register with your Hydrostream.org website. My Dad
used to sell hydrostreams in the late 70's up in
Aberdeen
South Dakota
, Lefty's Marine. Thanks for your advice.
Eric Wagner
Eric,
The
chip is a good move as the 96 drag engines were nothing more than a stock
260 with 26 cc heads. I would imagine yours has a pump gas head or it
would be in pieces by now. Stick with Chopper style props and lower the
motor until the steering torque goes away. You will probably be just below
the pad (bottom of the center pad) with the prop shaft centerline. By
going down on the transom, running the 24 chopper at 7500 plus rpm, and
getting the rooster tail down you should be in the 90’s pretty easy. The
rooster is giving it away that you are too high.
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.
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