Quote:
Originally Posted by swglenn
The Mercury 75/90/115 HP motors came out last year which may be why you haven't heard a lot about them. They are built on the same design as the 150 HP Mercury that came out with several years ago. The Mercury 150 HP motor has been a great motor. The 75/90/115 HP motors are 2.1 L. The Suzuki has 1.5L displacement so the Mercury is 40% larger. Suzuki uses a 2.0 L motor for their 115.
The Suzuki, like the Yamaha, is a DOHC motor which gives better breathing at top RPM's. That is why they can have smaller displacement, they make their power up top at higher RPM's, max 6000 RPM's. The Suzuki 90 HP motors go to 6300 RPM's. The Mercury is a SOHC which uses more displacement to make the HP, not more RPM's, max 5500 RPM's. The Mercury 90/115 motors go to 6000 RPM's. On hole shot the Mercury's extra displacement should make more power over the smaller high revving Suzuki's.
The dry weight of the Suzuki is 341# vs 359# for the Mercury so not a lot of difference.
I am biased, I have bought a 90 HP Mercury but have not finished building my boat to put it on. I hope Cajun Christian will give us his thoughts on what I have said about displacement vs RPM's on hole shot.
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On water performance may be closer than you think ...
Output power at the prop shaft is a major factor in performance and efficiency.
Performance may not be exact according to engine displacement alone and given max RPM's.
Lower unit gearing on a Mercury Optimax 90 is 2.33:1
Suzuki four stroke 90 is 2.59:1
Suzuki having the lower gear ratio ...
Numbers provided by Google ... don't burn me to the steak if Google is wrong !
Just food for thought !