Does this sound right to you?

[skategoat]

I have a 50HP Mariner 4 stroke powering a Scout Dorado 155. The boat has a dry weight of 650 lbs. and the hull is a tri-V hull (I think that's what they call them).<br /><br />With one adult and no gear, I am getting a top speed of 25mph at an RPM of around 5000. <br /><br />Does this sound right? Seems slow.

 

[captain spike]

Re: Does this sound right to you?

you might want to give it a compression test and go from there,or put your question in the engine forums!

 

[crazy charlie]

Re: Does this sound right to you?

Check with Mariner but the rpms sound a little low to me.Could be the prop.Charlie

 

[Solittle]

Re: Does this sound right to you?

Bet your speedo is way off. Try GPS.

 

[Jack Shellac]

Re: Does this sound right to you?

Seems slow to me ,too. I suspect something is wrong with speedometer. You should be turning more RPM than this, too. Post on the Mariner forum and you'll get more knowledgable answers about this particular motor.

 

[skategoat]

Re: Does this sound right to you?

Verified my speed with a GPS. Max speed was 30.9 mph. Does this sound right? RPMs were 6000. Just seems darned slow.

 

[rickdb1boat]

Re: Does this sound right to you?

I would go up on the pitch of the prop and get your RPM's down to 5500 or so and see if the speed increases. 6000 is a bit much for that motor. What pitch are you running now?

 

[kd6nem]

Re: Does this sound right to you?

Rick has good advice. <br /><br />How is your motor trimmed? Down too low and it will slow you up also.<br /><br />Personally 30MPH doesn't seem bad at all for a tri-hull with 50 HP. Much faster and it will beat you to death if there is any chop anyway.<br /><br />Did Mariner really make a four stroke? Never heard of that before. (lots of boating things I haven't heard yet)

 

[crazy charlie]

Re: Does this sound right to you?

Sound about right now that you have verified the new #s Charlie