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Author Topic:   190 Performance
hauptjm posted 11-25-2003 10:08 AM ET (US)   Profile for hauptjm  
jimh,

I am quite surprised at the differential in the displacement of the 115hp 2-stroke over the 115hp Optimax. I was under the impression that Mercury was using the original block and head designs in these engines. If that is the case, it sounds more like a 90hp conventional configuration "boosted" to 115hp via the Optimax technology. Regardless, it's a great article. I would like to see what the results of the 115hp 2-stroke would have been if it were tested with a stainless prop.

Richard Quinlivan posted 11-25-2003 12:52 PM ET (US)     Profile for Richard Quinlivan  Send Email to Richard Quinlivan     
Jim
I think you should recheck the displacement of the 115 HP classic. It is 113 cu in.,not 133 cu inches as you state in the article. [url]www.mercurymarine.com/mercury_115_classic [/url]

Dick

Richard Quinlivan posted 11-25-2003 02:56 PM ET (US)     Profile for Richard Quinlivan  Send Email to Richard Quinlivan     
I have spent some time looking at the charts in the reference sections. I have a 125 HP Classic on a 17 Dauntless Dual Console which is a shorter narrower boat with more deadrise (18 degrees). I believe that the 190 NANTUCKET with the 115 Classic (very similar to my 125) would do better with a 20 inch Laser II with the motor mounted higher. I can get about 45 - 46 on my boat at 5600 with the Laser II mounted as high as possible.

The 5500 rpm noted in the chart is above the 115's max rpm of 5250 and max hp is probably generated at 5000 to 5250 rpm. From what I read it is not adviseable to run those engines above the redline for long because of internal mechanical issues. I don't make a habit of running my boat at the max srpm very long or often.

Interestingly if you go to the Mercury prop selector and put in the 115 or the 125 for a 19 foot boat the prop selector software tells you that you need a larger engine.

Dick

Moe posted 11-25-2003 04:16 PM ET (US)     Profile for Moe  Send Email to Moe     
I get different results using a 19' boat and
Sal's 115 hp 4 stroke on the Mercury Prop Selector

Boat Type: Offshore Fishing

Performance Goal: Overall Good Performance

Estimated Boat Weight 2943
Estimated Top Speed: 41.9 mph
Theoretical Pitch: 18.3
Recommended Props
Black Max 19"
Laser II 20"
Vengeance 18"

Changing Length to Weight and using 4000 lbs

Estimated Top Speed 35.7 mph
Theoretical Pitch 15.5
Recommended Props
Black Max 16"
Vengeance 16"

Changing Goal to Quick Planing (4000 lbs)
Estimated Top Speed 35.7 mph
Theoretical Pitch 14.2
Recommended Props
Black Max 15"
(no Vengeance this time)

Changing Boat Type: to Fiberglas Fishing
and Goal back to Good Overall, with 4,000 lbs,
I get the Whaler tested props but not their
speed results...
Estimated Top Speed: 33.7
Theoretical Pitch 14.8
Recommended Props
Black Max 15"
Vengeance 14"

Whew!

--
Moe

jimh posted 11-25-2003 11:17 PM ET (US)     Profile for jimh  Send Email to jimh     
Corrected displacement of the classic 115-HP engine to 113-cu.in. from 133-cu.in. I looked right at it in the 2004 catalogue. but my eyes must have deceived me.

I just discovered this thread. It would be much appreciated if corrections could be contributed via email, that way I am sure to read them.

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