Roughly 5-10% less at the prop, which is how more modern OBs are rated: at the prop
Wont matter if you're putting a 140hp on a boat rated for a 120hp. I doubt anyone would listen to a 'compared to a more modern prop rated OB, its only a 126-133hp' argument
You could sell your 88 and buy a newer prop rated motor like a 140 looper and if that's to big you could find a 120 or a 130 looper.I would never trade a motor for one almost 10-15 yrs older JMO.
Doesn't have a rating but it has a cross flow 90 and barely gets 42 mph, so I want something larger so I can still have a respectable speed to get off the lake if bad weather hits and I have 2-3 people with me!
Doesn't have a rating but it has a cross flow 90 and barely gets 42 mph, so I want something larger so I can still have a respectable speed to get off the lake if bad weather hits and I have 2-3 people with me!
When you first posted about his boat a few years back, you wrote this.
I have a 16 ft aluminum walk-thru winshield starcraft that is rated for a 90 horse. I bought the boat with an johnson 88 spl it is a 1992 motor with pretty low hrs from the looks of it. I was wondering if I could go to a 50 horse newer model outboard like in the 2000 year model and still run pretty good? thanks
Yes it could be but I don't want to be caught again like my son and I were when the wind came up and my motor was then found under powered to get off the lake!
After the wind just popped up like that I thru out the idea of going smaller to get better fuel milage!
42mph is pretty darned fast for a 16' tin boat. And if the weather comes up, presumably the chop does too. I know from using my 16' tin boat on rough water, speed is definitely NOT your friend. (This from the guy who is building a 140 to replace the tired 90... That said, just because the throttle goes to the floor, doesn't mean you need to put it there.)
I have a 1978 16' Starcraft hull design is similar if not identical to yours and mine is rated for an 85 hp but later ones were bumped to 90. My boat with me ,my dog, 3 batteries and 15 gallons of gas all my fishing gear and a 15 hp kicker I can run 39 MPH with a 1986 Evinrude 70 hp GPS speed. You may want to look at your set-up and really the only way to beat the weather is get a bigger boat or stay off the lake.
I would think something is wrong with the set up or the motor...if you can only get 42 MPH out of a 90 hp motor on an 16 ft boat.....is it aluminum or fiberglass??
I had an aluminum 16 ft alumacraft with a 50 hp on it and I could do 40 MPH!!
besides when the weather turns nasty.... you cant possibly do 40 mph!!!.....
Agreed, sometime you will get better performance from the RIGHT sized motor, too much weight in the back? to much bow rise? in nasty weather, you dont want all your weight in the back, that would end badly. A good 70 - 90hp is all Id go with.... be safe!
