Twin 4.7's for a 31 Foot Boat

bobh

bobh

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Hi Everyone - it's been a few years since I posted on this forum. Hope everyone is doing well. I am considering purchasing a 2016 Monterey 315 with twin 4.7's. I'm concerned that it may be under powered.It's been difficult to find any specifications online for this boat and motor combo. Does anyone have any experience
with the twin 4.7's on a 30'boat?

Thanks!

Bob
 
Sounds underpowered but any idea what the weight of the boat is? The power needed is about the weight not the length. The length specs put out by manufacturers is suspect at times.
Jim
 
I assume the boat has I-O's. If so, borderline, but a seatrial will tell you. Have at least 4 people on board when you seatrial it.

If the boat is IB, definitely underpowered.
 
Sounds a bit underpowered to me though I've never been on a Monterey, and would be smaller engines than I could find listed in Monterey 28-32" boats for sale.

Are you sure they are 4.7L engines? I can't see those old ford 289ci engines( if that's what they are) being offered in a 2016 boat. Brokers are full of misinformation, so be sure to carefully inspect the engines yourself. And on a sea trial, similar to CWMS' suggestion( except mine is not as reasonable), I'd suggest taking along as many people as you ever expect to have on board for a short cruise, and have both gas and FW tanks full. That may still be considerably less weight onboard than you might have if/when you own it.

If by any chance that is "Seas The Day" it looks like the ads pointedly neglect to mention anything at all about the engines except I/O.
 
4.7 ?? Could you have meant either 4.1 V6's to 5.7 V8's ?
 
My Monterey 298ss has a dry weight of about 8000 lbs. dry. It has two Volvo 5.7’s in it. It’s 2000lbs lighter than yours and definitely gets up and goes but I don’t think I would be very happy with smaller motors. An underpowered boat can be frustrating and embarrassing when you have a boat full and struggle to get on plane. If that is the correct info on the motors be very careful with your sea test and like it says above, load it up with people, fill the fresh water tank, and check the level of the gas tank. If it struggles to get on plane or run comfortably, walk from it.
Jim
 
I believe it comes down to HP. My Larson cabrio 310 weighs 10,500 lbs with 2 5.7l engines putting out 220 hp each. With more than 4 aboard there were times when she struggled a bit to plane.

My new vortecs add 20hp each so looking forward to the additional 40!
 
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