how much fuel savings from 110 2 stroke to 60hp 4 stroke , 18 ft tinny?

[Lund_bC]

someone wants my old 110 1992 evinrude 2 stoke for their boat and offering a good price, thinking of taking it to buy a 60hp 4 stroke from 2000.. how much fuel savings do you think i might see on a 18 ft tin boat (it's light boat)

 

[jimmbo]

It idle it will burn less, at higher speeds it hard to tell, it is not going to be as fast, so the 115 can be throttled back to the 60s top speed. and the differences in fuel mileage might not be as great as you think.

 

[Scott Danforth]

if you want fuel economy in a boat, get a set of oars or a sail

as jimmbo was eluding to, the difference may be about 10 gallons a year difference in actual usage at that power level.

 

[tpenfield]

All seriousness aside, I'd say 16.125 . . . but the sail idea is probably the best savings.

I think you are just going to have to try it and find out.

 

[Lund_bC]

i would hate to swap motors to save a gallon a trip. I would like the quiter motor but maybe the old two stroke, on the boat is kind of like a crab in the bukcket so to speak.

 

[Lund_bC]

it's amazing how condesending rich people are about boating lol..

 

[GA_Boater]

it's amazing how condesending rich people are about boating lol..

Actually - Us poor folks may be more practical.

To answer your question - There is no answer. Too many unstated variables, like other than possible fuel economy improvement, how do you use the boat? And what is the max HP for your Lund? It may be a pig with only a 60 on the back and it could take more gas to match performance.

 

[racerone]

??-----Looks like 1989 was the last year for the 110 hp marketing / decals.----Same motor was marketed as a 90 and 115 HP for many other years.

 

[thatone123]

Gas consumption? A guy I know goes down a big Northern River with 1200 gallons aboard. Just to hunt Moose! Twin 200's burn it up pretty fast, especially going back upstream.

 

[havoc_squad]

You would have to go through a ton of gas, almost to the point of commerical heavy use for repowering with a new or almost new 4 stroke to break even or better on gas cost.

Otherwise there's no financial incentive for most recreational users to repower if the outboard is dependable, good running condition, and has good fair priced parts support.

As for new and shinny factor, or government regulations ending support of outboards not meeting emissions standards, that's another discussion/can O' worms.

 

[JimS123]

I used to own a 14' deluxe aluminum utility that had a 2000 vintage 25 HP 2-stroke on it. Dry hull weight ~400 lbs. I replaced it with a 15' fiberglass CC equipped with a new 60 HP 4-stroke. Dry hull weight ~950 lbs.

My "typical" fishing trip includes 6 miles at no-wake speed, followed by 8 miles at cruising speed, and then returning the same way after fishing. The fuel consumption is almost exactly the same, though in one case it was 50:1 premix, and straight gas in the other.

Just for grins and giggles, the same trip with a 200 lb boat and a 1950 vintage 25 HP 2-stroke (@16:1 oil mix) used THREE TIMES more fuel.

Obviously, not an apples to apples comparison, but it should at least provide some insight into how economy has improved over the years, plus highlight the efficiency of the modern 4-stroke.

Regardless, unless the motor swap is going to result in a huge cash-back, if the current motor is running well, the economic incentive probably wouldn't be worthwhile.

 

[Scott Danforth]

it's amazing how condesending rich people are about boating lol..

no one on this site is rich. we just know that economy and boating are a dichotomy. we also know that cutting your power in half usually means you burn more fuel.

however to put it this way, if you routinely used more than 1/4 throttle of your 110hp, then you wont save any noticeable money with the 60hp.

your 2-stroke burned about 0.5# of fuel per hp per hour.

the 4-stroke will burn about 0.4# of fuel per hp per hour.

each engine is different and the BSFC curves are not flat, however follow along

so if you routinely used 60hp to push your boat around with the 110hp, you will be at WOT all the time with the 60. and in one hour, you may save about 3/4 of a gallon of fuel, however you will beat the 60hp to death running it at WOT all the time.

at a fuel burn of 30hp, the 110 may actually burn less fuel than the 60hp, as the 110 BSFC curve may be better.

if your boat needs 50hp to get up on plane, then the 60hp may struggle most of the time if your loaded

since you left out so much detail, we cant really even help. the only detail we know is your current motor is a 110hp 1992 johnnyrude and your looking at a 60hp 4-stroke

what hull? a light hull means nothing if it has the hydrodynamic profile of a brick
what is it rated for? - many times you need to stay at 75% or higher of max rating or the hull is a dog
do you boat in wind?
do you boat in current?
is the boat loaded?

 

[racerone]

Wondered how you can determine the " rich people " by reading posts on here ???

 

[tramsdell]

Wondered how you can determine the " rich people " by reading posts on here ???

That's because people like me always talk in a Thurston Howell voice when typing.





OP, i don't think one should step down hp unless you bought an overpowered boat, or your current OB is dead and you have budget restrictions (poor ppl problems...). Youre talking about half your hp out the window... you will miss that, chap.

 

[JimS123]

A "rich" person is someone who has more than you do. E.G., Buffet thinks Bezos is rich. Or, if you're homeless and your homeless buddy just got $5 by panhandling, you'll resent him as well.

(Mary Ann, not Ginger. Lovey was OK too. I bet many on here won't understand that, eh Thurston?)

 

[tramsdell]

A "rich" person is someone who has more than you do. E.G., Buffet thinks Bezos is rich. Or, if you're homeless and your homeless buddy just got $5 by panhandling, you'll resent him as well.

(Mary Ann, not Ginger. Lovey was OK too. I bet many on here won't understand that, eh Thurston?)

Crabs in a bucket.

 

[tpenfield]

A "rich" person is someone who has more than you do. E.G., Buffet thinks Bezos is rich. Or, if you're homeless and your homeless buddy just got $5 by panhandling, you'll resent him as well.

(Mary Ann, not Ginger. Lovey was OK too. I bet many on here won't understand that, eh Thurston?)

What about Gilligan & the Skipper . . .

 

[tramsdell]

If you have to ask, you can't afford it .

 

[GA_Boater]

If you have to ask, you can't afford it .

Do you just hand a dealer a bag of cash and tell him to take what he needs? The bag could be full of live crabs,

Can we stay on topic?

 

[tramsdell]

Do you just hand a dealer a bag of cash and tell him to take what he needs? The bag could be full of live crabs,

Can we stay on topic?

My sincere apologies, ol boy. OP, i dont think you should downgrade HP. If you like to putter around and wanna save fuel, a good trolling motor is the way to go! I enjoy a good day of sightseeing at trolling speed, and it doesn't burn any fuel.