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Posting a reply to: Re: 60 HP tiller advise

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[QUOTE]VMS - 3/4/2014  6:59 PM

Hiya,

First, you would not be gaining 15% in horsepower... it would be 33% and a touch more.  In terms of overall speed, you would probably see about 3 mph more give or take a little.  In general 5 hp equates to about 1 mph of speed....the gains are in the low end due to extra torque created by the higher horsepower.

Weight of the motor is not what should be the main determining factor as extra weight in the rear actually makes the bow easier to trim due to the center of gravity of the entire rig moving to the rear.  What SHOULD be considered is the engine displacement.  The larger displacement, the more "umph" the motor is going to have, which becomes a huge benefit for hole shot, maintaining a rig on plane at lower rpm, and especially when working larger waters, most notably a following sea.  In most cases, the larger displacement will weigh more, but the benefit of displacement will far outweigh the extra weight.

Displacement is a major indicator to follow as with so many motors that have been made over the years is the same powerhead is used for multiple horsepower.  This usually equates to a lower rated motor having more HP than stated, and the top HP probably being a touch below the rating.  Case in point:  The OMC/Suzuki 90 hp and 115 2 stroke models.  Both were built on the 60 degree V-4 block, with the 90 detuned a touch.  In fact, in the OMC days  the 90 to 130 hp carried the same displacement.  The 90 is a beautiful engine that would definitely dnyno over 90 hp...probably closer to 100 if not a tad over.  Manufacturers are given a 10% leeway in actual HP vs rated HP.

With the motors out there in existence for a 60hp power plant, I don't think you could go wrong with any motors build in that size...merc and evinrude being the only ones I know of in that HP.    Both are strong motors and will do your rig well.  If you decide to find a used model, the OMC 60 hp 3 cylinder would be a solid motor as well, with the only setback being a carbed 2 stroke.  The nice thing about the older 2 stoke, it might have a little better hole shot, although trolling and fuel economy will be the sacrifice.

Steve
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VMS

Posted 3/4/2014 6:59 PM (#696230 - in reply to #696178)
Subject: Re: 60 HP tiller advise

Posts: 3480

Location: Elk River, Minnesota

Hiya,

First, you would not be gaining 15% in horsepower... it would be 33% and a touch more. In terms of overall speed, you would probably see about 3 mph more give or take a little. In general 5 hp equates to about 1 mph of speed....the gains are in the low end due to extra torque created by the higher horsepower.

Weight of the motor is not what should be the main determining factor as extra weight in the rear actually makes the bow easier to trim due to the center of gravity of the entire rig moving to the rear. What SHOULD be considered is the engine displacement. The larger displacement, the more "umph" the motor is going to have, which becomes a huge benefit for hole shot, maintaining a rig on plane at lower rpm, and especially when working larger waters, most notably a following sea. In most cases, the larger displacement will weigh more, but the benefit of displacement will far outweigh the extra weight.

Displacement is a major indicator to follow as with so many motors that have been made over the years is the same powerhead is used for multiple horsepower. This usually equates to a lower rated motor having more HP than stated, and the top HP probably being a touch below the rating. Case in point: The OMC/Suzuki 90 hp and 115 2 stroke models. Both were built on the 60 degree V-4 block, with the 90 detuned a touch. In fact, in the OMC days the 90 to 130 hp carried the same displacement. The 90 is a beautiful engine that would definitely dnyno over 90 hp...probably closer to 100 if not a tad over. Manufacturers are given a 10% leeway in actual HP vs rated HP.

With the motors out there in existence for a 60hp power plant, I don't think you could go wrong with any motors build in that size...merc and evinrude being the only ones I know of in that HP. Both are strong motors and will do your rig well. If you decide to find a used model, the OMC 60 hp 3 cylinder would be a solid motor as well, with the only setback being a carbed 2 stroke. The nice thing about the older 2 stoke, it might have a little better hole shot, although trolling and fuel economy will be the sacrifice.

Steve