Posted by tedious on 09/06/17 - 4:27 AM
#27
JRP wrote:
Boston Whaler has now added performance tables for the larger 115 hp Merc Fourstroke/CT engine option.
The 90 hp Merc Fourstroke/CT does somewhat better on fuel economy at slow displacement speeds, but the 115 actually does better and has a greater range at mid-range planing speeds.
The 115 has the boat up on plane doing 16.3 mph at 3000, whereas the 90 only has it at 11.1 mph (at 3250 rpm, the 90 hops up on plane.) The 115 yields a top speed of 46.0 vs 40.0 for the 90.
It sure seems like the 115/CT engine is a worthwhile option for this new Montauk model. However, it's a $990 option!
The cruise speed (defined as the planing speed which gets the best mileage) for the 115 is 3 MPH faster. That is very significant and would make a lot of difference to me.
Honestly they should have offered the 115 on the previous 170 - it always felt to me like it needed more power. With the newer model being quite a bit heavier, I'd expect it to feel even more underpowered with the 90.