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Author Topic:   Max Horsepower

Lostinfog posted 10-14-2002 03:56 PM ET (US)
Does anyone know where I can find the min/max horsepower rating for a 1967 and 1970 16 footer?
tully_mars posted 10-14-2002 04:10 PM ET (US)
It is 100hp, same then as it is now.
Tully Mars
Bigshot posted 10-14-2002 04:21 PM ET (US)
min is 40hp.
Bigshot posted 10-14-2002 04:21 PM ET (US)
35 maybe.
Lostinfog posted 10-14-2002 05:05 PM ET (US)
So a 115hp wouldn't exactly be pushing it...?
kingfish posted 10-14-2002 05:41 PM ET (US)
Lostinfog-
It might be pushing it more than you think *if* the original 100 hp rating was established when horsepower was rated at the powerhead, and the 115 HP motor you are contemplating is rated at the prop. I don't remember exactly when the standards changed, but I believe it was worth about 10% difference which could roughly translate into installing a 125hp to 130hp engine on a boat rated for 100 hp.
Tom W Clark posted 10-15-2002 11:13 AM ET (US)
The power ratings of outboards changed from power head to prop shaft in the mid 1980's so it's true that a modern 100 hp motor is more powerful than a powerhead rated motor.
But the fact remains that the 16/17 Whaler hull still has a 100 hp maximum capacity, regardless of how the motor is rated. That never changed.
A 115 is a very common power option for the 16 footer. It will be a lot of power but you do not have to use it all.
A 115 and a 90 are typically the same weight so there is not much of an issue there.
Minimum recommended horsepower to plane satisfactorily is 35 hp.
Bigshot posted 10-15-2002 11:33 AM ET (US)
A 70's 100hp is about the same as a 85hp OMC or a 90hp Yamaha in my opinion. When we bought our Suzuki 140 back in 1981, 15% was the loss on hp so that zuki was more like a 160hp. And a 140 other was more like a 115 Zuki. I had a 17 with a 115 and it was not all that faster than most 90's but enjoyed fuel to the max.
Lostinfog posted 10-15-2002 12:45 PM ET (US)
Thanks for all the info guys, definately brought up some issues I had not considered...does anyone here have an opinion on the Honda Saltwater Series 4 strokes?
Bigshot posted 10-15-2002 01:36 PM ET (US)
Sure! They are silverish gold.
Bigshot posted 10-15-2002 01:37 PM ET (US)
Kidding....what Hp? If 115 then absolutely not. That engine weighs 500lbs.....no dice on a 16/17.
Lostinfog posted 10-17-2002 05:01 PM ET (US)
Bigshot,
Thanks for the info on the Honda. You brought up a very important point about the weight. Is there somewhere I can obtain a spec sheet for my 1967 16 footer? I would love to know the weight restrictions and possibly get some more history about the boat in general. When I bought the boat, the original console had been replaced and I'm looking to return it to it's original form, but some sort of blueprint etc would be helpful.
lhg posted 10-17-2002 05:18 PM ET (US)
Be sure to check out the 16/17 Reference section. I ran a 1973 Merc in-line 6 150HP (powerhead rated) for 12 years on a 16' Nauset. Would turn about 56mph, but the boat easily handled it's 275lb weight. The boat gets a little squirrely above 50mph. After I wore that engine out, I put on a 305 lb 1985 Merc 115 in-line 6, and the boat handled that also. It was not quite as fast as the 150.
This engine is now on my 18 Outrage.
JBCornwell posted 10-17-2002 05:21 PM ET (US)
Howdy, Lost.
BW has published a 400lb limit for transom load on the classic "17", which is about the weight of some of the 90-100hp 4 strokes.
Bigshot and I both have 336lb SuziRude DF70s on our Montauks. I like mine just fine, thank you.
I don't think I would want more than 350lb on a "16", and really liked the way my Sakonnet handled and performed with a 250lb JohnnyRude 70 2 stroke.
Red sky at night. . .
JB
jstachowiak posted 10-27-2002 07:33 AM ET (US)
I agree with Bigshot. I just repowered with 70HP 4 stroke Evinzuki on my 1979 Newport, well drains are now just under water with no one in the boat. I can't imagine any more weight back there. The 70HP is perfect for this boat. My old 1979 90hp Merc I had was really about 75hp with the difference in how they figured HP back then. Narrow your choices by staying under 100hp, 90hp 2 stroke of 70/75 4 stroke. More than enough power.

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Author	Topic: Max Horsepower
Lostinfog	posted 10-14-2002 03:56 PM ET (US) Does anyone know where I can find the min/max horsepower rating for a 1967 and 1970 16 footer?
tully_mars	posted 10-14-2002 04:10 PM ET (US) It is 100hp, same then as it is now. Tully Mars
Bigshot	posted 10-14-2002 04:21 PM ET (US) min is 40hp.
Bigshot	posted 10-14-2002 04:21 PM ET (US) 35 maybe.
Lostinfog	posted 10-14-2002 05:05 PM ET (US) So a 115hp wouldn't exactly be pushing it...?
kingfish	posted 10-14-2002 05:41 PM ET (US) Lostinfog- It might be pushing it more than you think if the original 100 hp rating was established when horsepower was rated at the powerhead, and the 115 HP motor you are contemplating is rated at the prop. I don't remember exactly when the standards changed, but I believe it was worth about 10% difference which could roughly translate into installing a 125hp to 130hp engine on a boat rated for 100 hp.
Tom W Clark	posted 10-15-2002 11:13 AM ET (US) The power ratings of outboards changed from power head to prop shaft in the mid 1980's so it's true that a modern 100 hp motor is more powerful than a powerhead rated motor. But the fact remains that the 16/17 Whaler hull still has a 100 hp maximum capacity, regardless of how the motor is rated. That never changed. A 115 is a very common power option for the 16 footer. It will be a lot of power but you do not have to use it all. A 115 and a 90 are typically the same weight so there is not much of an issue there. Minimum recommended horsepower to plane satisfactorily is 35 hp.
Bigshot	posted 10-15-2002 11:33 AM ET (US) A 70's 100hp is about the same as a 85hp OMC or a 90hp Yamaha in my opinion. When we bought our Suzuki 140 back in 1981, 15% was the loss on hp so that zuki was more like a 160hp. And a 140 other was more like a 115 Zuki. I had a 17 with a 115 and it was not all that faster than most 90's but enjoyed fuel to the max.
Lostinfog	posted 10-15-2002 12:45 PM ET (US) Thanks for all the info guys, definately brought up some issues I had not considered...does anyone here have an opinion on the Honda Saltwater Series 4 strokes?
Bigshot	posted 10-15-2002 01:36 PM ET (US) Sure! They are silverish gold.
Bigshot	posted 10-15-2002 01:37 PM ET (US) Kidding....what Hp? If 115 then absolutely not. That engine weighs 500lbs.....no dice on a 16/17.
Lostinfog	posted 10-17-2002 05:01 PM ET (US) Bigshot, Thanks for the info on the Honda. You brought up a very important point about the weight. Is there somewhere I can obtain a spec sheet for my 1967 16 footer? I would love to know the weight restrictions and possibly get some more history about the boat in general. When I bought the boat, the original console had been replaced and I'm looking to return it to it's original form, but some sort of blueprint etc would be helpful.
lhg	posted 10-17-2002 05:18 PM ET (US) Be sure to check out the 16/17 Reference section. I ran a 1973 Merc in-line 6 150HP (powerhead rated) for 12 years on a 16' Nauset. Would turn about 56mph, but the boat easily handled it's 275lb weight. The boat gets a little squirrely above 50mph. After I wore that engine out, I put on a 305 lb 1985 Merc 115 in-line 6, and the boat handled that also. It was not quite as fast as the 150. This engine is now on my 18 Outrage.
JBCornwell	posted 10-17-2002 05:21 PM ET (US) Howdy, Lost. BW has published a 400lb limit for transom load on the classic "17", which is about the weight of some of the 90-100hp 4 strokes. Bigshot and I both have 336lb SuziRude DF70s on our Montauks. I like mine just fine, thank you. I don't think I would want more than 350lb on a "16", and really liked the way my Sakonnet handled and performed with a 250lb JohnnyRude 70 2 stroke. Red sky at night. . . JB
jstachowiak	posted 10-27-2002 07:33 AM ET (US) I agree with Bigshot. I just repowered with 70HP 4 stroke Evinzuki on my 1979 Newport, well drains are now just under water with no one in the boat. I can't imagine any more weight back there. The 70HP is perfect for this boat. My old 1979 90hp Merc I had was really about 75hp with the difference in how they figured HP back then. Narrow your choices by staying under 100hp, 90hp 2 stroke of 70/75 4 stroke. More than enough power.