Will a 14' aluminum vhull be fast with a 35hp evinrude?

[Bass_boy7]

Hey guys I had a old friend give me a 1957 35 hp evinrude runs mint, I was wondering if its going to be really fast on my 14' v hull boat, its a deep wide edition, I have it convered with casting decks etc so its heavier now then the normal weight, my transome plate says 30 hp max but would the 35 be really quick on it, or nothing fabulous? bc I feel my 25 struggles sometimes with 3 ppl in the boat.

 

[achris]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

My experience shows that ali hulls have a maximum speed and putting more power on them generally doesn't make them go any faster... Also if the hull is designated as MAX =30, then you would be ill advised to exceed that... You'll have not insurance, 3rd party or otherwise...and in some places you'll actually be breaking the law....

Chris.......

 

[Bass_boy7]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

yes I understand that, but I was wondering if it would make a significant difference over my 25 that is on it now with the weight of my boat is my main question, laws aside and all.

 

[Willyclay]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Your 1957 motor was rated 35HP at the crankshaft if not merely by the OMC Marketing Dept. If your boat was built later than 1985, then it was made for "new" motors rated at the propshaft which is typically 12-15% less than the "old" motors rated at the crankshaft. By that logic, it might be okay from the power aspect but don't expect it to be a speed demon. They don't make high RPM's and the lower unit is kind of bulky. Great classic old motor!

 

[achris]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

yes I understand that, but I was wondering if it would make a significant difference over my 25 that is on it now with the weight of my boat is my main question, laws aside and all.

Probably not........

It also depends on what you mean by 'really quick'... My boat can reach 43 knots and where I go, that is not just really quick, that's seriously quick, bordering on dangerous! But compared to some of the bass boats running up at 60+, mine is seriously slow... But there's no way they'd catch me in a race to Rottnest. I'd be home with a beer before they were half way there... Horses for courses....

Chris......

 

[jbjennings]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Like they said, you probably won't notice a lot of difference, particularly in top end speed. But it might help quite a bit with your weight problem since it has a lot of torque. I'd love to have your '57 35hp! Congrats! I figure on a GPS you'd be lucky to gain 1mph if any.

 

[Chinewalker]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

If your boat is having issues planing out with 3 people, it might be worthwhile to drop down an inch or two in pitch to let the 25 make its power a bit more efficiently - kind of like downshifting to pull a trailer uphill...
- Scott

 

[Bass_boy7]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

I mean in general will my boat have a bit more get up and go compared to my 25 that is currently on it now. As I stated above I find sometimes it feels sluggish with 3 ppl in the boat and all my decking etc.

 

[achris]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

I mean in general will my boat have a bit more get up and go compared to my 25 that is currently on it now. As I stated above I find sometimes it feels sluggish with 3 ppl in the boat and all my decking etc.

As stated above, change to a finer pitch prop and you'll get the lost performance back...

 

[Bass_boy7]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

yea i definately will be looking into a new prop as well, i guess I will throw the 35 on there for ****s and giggles and see how it goes. we compression tested it and its 120 on both cylinders so its a strong motor.

 

[surveyor gerry]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

I am running a 1959 35hp on a 14' aluminum runabout with a 13 pitch blade. GPS clocks it at 25 mph with only me. I would guess with the extra weight you would be a little less than that.

 

[Willyclay]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

I ran a 1959 Johnson 35HP on a Glastron V-153. It would get on plane but no clue of top speed. Also, would pull an adult water skiier on two skiis.

Just sent you a PM.

 

[monk-monk]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

at least you show some wisdom by asking what to expect! An you know your gonna mount it on there and try it out regardless! (LOL)! The point here is that i was just thumbing through the iBoats forums because i learn stuff here, and i ran across this thread...no real interest of mine, but i thought i'd read it...Things were said and points were made, and as i read all this: I became aware of something...two-stroke engine performance can be dictated by so many variables...boat size, load capacity, weight distribution, prop size for these specifics! I am relatively new to boating and trying to learn all i can...but this thred just makes me realize how broad the horizon is when it comes to figuring out whats "just right" for ones application! Can it ever be just perfect?

 

[Scorpion 210 LTD]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Remember too that those older motors weigh more from a hp/pound perspective.

 

[BigB9000]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

my 15' alum was rated for 35. i had a 20 on there and it was scary.

speedwobbles, shakey hull.... eek. no thank you

 

[mthieme]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

There is no substitute for cubic inches.

 

[CATransplant]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Remember too that those older motors weigh more from a hp/pound perspective.

Uh, not so much. The engine he's talking about weighs about 150 lb. That's all. It just looks heavy. Will it push his boat better than his newer 25hp. Yup. The 35hp Big Twins have gobs of torque, and that will help put his boat on plane faster and keep it there easier. Will it go faster, in terms of top speed? Not much, but the boat will perform better overall.

 

[Scorpion 210 LTD]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Uh, not so much. The engine he's talking about weighs about 150 lb. That's all. It just looks heavy. Will it push his boat better than his newer 25hp. Yup. The 35hp Big Twins have gobs of torque, and that will help put his boat on plane faster and keep it there easier. Will it go faster, in terms of top speed? Not much, but the boat will perform better overall.

Interesting, I would have thought that that big old thing weighed a ton! Kind of like comparing an old BB Chevy to a newer SBC. You learn something new every day.

 

[CATransplant]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

Most of the big twin's bulk was air. The outer covers on the leg, introduced in 1958, actually weighed very little, but quieted the thing down dramatically. Under those was a typical 50's twin.

I was shocked, too, when I pulled my 58 Johnson RDS-20 off the transom. I had a friend there, and we figured it'd be a big lift. We were really surprised when it was no big deal.

I believe the short shaft of 1958 was 141 lb. The long shaft added about five more pounds.

With a 13" pitch prop, the 35 he's talking about will pop his tinny on plane a lot faster than the 25hp he has and keep it there without stress. Like I said, it won't really go any faster that what he has, but it'll sure feel better.

Those 35s were the primo outboards of their era. OMC introduced the 50hp 'Fat Fifty" at the same time, but on a 14' boat, the 35s made great little skiing engines, due to their torque.

I grew up with those engines and on water skis. The Mercs were a bit faster on the top end, but the Johnnyrudes would pop skiers up a lot easier.

Lots of nostalgia in them for me.

 

[Bass_boy7]

Re: Will a 14' aluminum vhull be fast with a 35hp evinrude?

This is all great information to hear, Im excited to give it a whirl on my boat, I think when I meant speed wise I meant performance and handling like I said my 25 feels sluggish with 3 ppl in the boat so I guess the 35 will feel much better.