Author Topic: one mercury 150 hp four strokes for a express fisherman 25 1985 (Read 471 times)

aqua · « **on:** October 05, 2015, 12:49:43 PM »

Hello , do you think that putting a single 150 four strokes mercury will put a express fisherman on plane ? I don't want to go faster than 30 m-hours . On the mercury website ; they put a 150 four strokes on a 24 CC Laguna 4300 pounds and the top speed was 45 miles -hours ! Does someone have put a 150 four strokes on a 25 aquasport ? Thank's .

fitz73222 · « **Reply #1 on:** October 05, 2015, 06:38:24 PM »

Too small, you will wind up regretting a 150 on that boat. I would like to read all about a 150 on a Laguna 24 hitting 45 mph. You need a 250 on that boat and pull the throttle back to cruise at 30 mph as you want.

RickK · « **Reply #2 on:** October 05, 2015, 07:26:32 PM »

I agree with Fitz - I have a 250 on my 230 and at 30mph I have about 25% more throttle and that is what you need to baby the engine and not run it too hard.

aqua · « **Reply #3 on:** October 05, 2015, 07:30:28 PM »

Thank,s for the information , this is the test by mercury marine about a 24 laguna cc : https://www.mercurymarine.com/en/ca/performance-tests/bhb/3154/?units=imperial

CLM65 · « **Reply #4 on:** October 05, 2015, 09:04:45 PM »

Hmmm. That boat is rated for 400 hp. I'm thinking maybe they had twin 150s, but it doesn't say it anywhere

.

GoneFission · « **Reply #5 on:** October 06, 2015, 09:24:55 AM »

The newer 4-stroke Merc 150 is a 3 liter, inline 4 cylinder engine. A 3 liter inline 4 is an inherently unbalanced engine, so you would not want to wind it very tight. Merc specs say 5800 RPM max - but it's going to be buzzin' like your cousin above 4500. I have not seen the inside of one yet, but maybe they use a balance shaft to offset the vibration. A single overhead cam setup has room in the block for a balance shaft like Chrysler/Mitsubishi did on the K-car back in the 80s.

The Laguna 210 bay boat does 44 MPH with a 150 Vrod - so I would agree with Fitz that the test results were likely twin 150s for the Laguna 24. Twin 150 outboards are the standard power setup for the Laguna 24.

aqua · « **Reply #6 on:** October 06, 2015, 10:59:01 AM »

Thank's for the information , so a 200 hp yamaha four strokes will be better ?

RickK · « **Reply #7 on:** October 06, 2015, 04:21:13 PM »

Better than a 150 but still not what you really need on a 25ft boat. Twin 150s or a single 250 is what you need.
Your boat is 2900lbs by itself
http://www.classicaquasport.com/gallery/showphoto.php?photo=2866&title=as-all-models-86-11&cat=574

Author Topic: one mercury 150 hp four strokes for a express fisherman 25 1985 (Read 471 times)

aqua

one mercury 150 hp four strokes for a express fisherman 25 1985

fitz73222

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

RickK

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

aqua

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

CLM65

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

GoneFission

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

aqua

Re: one mercury 150 hp four strokes for a express fisherman 25 1985

RickK

Re: one mercury 150 hp four strokes for a express fisherman 25 1985