How fast should she go?

Dmopar74

Cadet
Joined
Oct 27, 2014
Messages
26
I'm wondering how fast my 18' 1983 sun runner OB 230 hp omc with stringer 800 drive should be going? Just a general ballpark as I would like to track down any gremlins she might have. I'm aware of a lot of variables but somebody has to have a clue?
 

smassey22180

Petty Officer 1st Class
Joined
Apr 15, 2013
Messages
210
Yes lots of variables. I was surprised how my new 4.3 is not much faster than my old 3.0. Weight is a killer. I would say 45-50 mph. Even a 3.0L on a 17' will hit 45 on a good day.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
47,296
with the right prop and weight balance you should be high 40's
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,030
I had a 4.3LX in an 18' SeaRay kinda like that. She would do ~45MPH, downhill with the wind. Of course on the trailer she would do 70....down the parkway.
 

southkogs

Moderator
Staff member
Joined
Jul 7, 2010
Messages
14,783
Mid to high 40's depending on what she weighs in at. My 18' with 165HP will run about 32 without trim.
 

thumpar

Admiral
Joined
Jun 21, 2007
Messages
6,138
I had an 83 Sunrunner. They are pretty good boats. I would guess that you should hit mid to high 40's if the motor is not tired.
 
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