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I have the Volvo 8.1 with DP and yesterday we were out with 4 adults full of fuel and full of water. We hit 43.5 on GPS WOT cruises nice at 3500rpm 31mph GPS
With my two cruisers 2013 EC 310 and 2014 EC 360 the initial engine run-ups were both supervised by the area Mercruiser representative - as part of the Axius "personality" adjustments.
He made it clear that the engines had to run in their RPM range or something would be very wrong and the engines would suffer - we all know this.
On both boats the engines ran right near the top of their WOT.
If you are running outside of your engines specified WOT range, IMO - you have a problem: boat over weighted, some underwater obstruction (barnacles/swim platform drag), your props are wrong, your boat is improperly trimmed, your clutch and/or coupler is slipping.....or......the boat may be underpowered.
I laugh when I see a 350/360 Rinker with twin 350 Magnums. Whoever allowed that should be shot. To find one go to the Yacht sales. When you see a real low price for a 350/360 look at the powering. I bet it has twin 350s or 377s ....dumb, bumb, dumb!
When I see 350/ 360 with 377 I don't laugh but I do cringe as that too is IMO waaay underpowered. A friend had one and hated it (I have written about this before).
Properly mated with power, Rinkers will accelerate and handle like high performance boats. Example Rinker EC 310 with twin 350 mags - superb! Rinkec EC 350/360 with 496s - excellent! Rinker Ec 360/370 with 502 Mags - unbelievable!
I have read so many sad cases on this forum over the years of underpowered boats and the grief they cause....and where an owner has stepped -up in a repower and found new joy.
If you are getting a deal that seems to be too good on a boat look at its powering. Find the same boat that is more expensive - I bet it has bigger engines.
For enjoyment AND re-sale stay away from underpowered boats.
BTW - Don't blame Rinker for sending underpowered boats out of the factory. A number of dealers - one in particular, in the U.S. - is a real, IMO, AH - who brings in low priced Rinker cruisers with engines that are, IMO, ridiculously underpowered.
My dealer and a nearby one in Quebec (Marina Port Lewis) were well known for recommending the biggest engines to potential Rinker customers and only spec ordering Rinkers with the most powerful engine packages.