On Fri, 11 May 2018 12:36:10 -0700 (PDT), Its Me
wrote:

On Friday, May 11, 2018 at 11:21:00 AM UTC-4, wrote:
On Fri, 11 May 2018 07:12:03 -0700 (PDT), Tim
wrote:

Now I have 3, an 85 horse and a 140 horse Evinrude, also a guy just gave me a really nice 115 hp Mercury 115 “tower of power” . Yes,... gave me. Though obsolete,these 2-cycle engines are mechanically sound and trustworthy.

I’ve found another 30’ r only this time it’s a tri-toon., minus an engine. For doing a lot no range river cruise (approx 300 mile 1way) I’m wondering which power would best be suited between the 115 merc or the 140 Evinrude.
I really doubt one would be more economical than the other. But seeing I’m not paying forvengines there’s lots of room on the card for fuel.
Decisions decisions...

Assuming all else is equal go with the 140. That tri toon will go if
you goose it hard enough. I see tri toons around here with 300s on
them. I am guessing it has lifting strakes.

A 30ft Tri-toon is a big, heavy boat. My old Bennington 25ft tri with lifting strakes and a Johnson 150 would get up "on plane" but only get 28-32 mph depending on conditions. It took the 25ft PTX tri with a 250 to hit 40 mph. Tim might be looking at mid 20's with the 30ft and a 140. Still better than most twin-tube toons.

My 20' Harris gets about 22-23 (GPS) with a 60 Merc EFI or a F70
Yamaha. There was virtually no difference between the 2. The 75 2
stroke Merc could do more like 24.