Gas expense.... O/B vs I/B ??

rappleby99 · Newbie Joined: 30 Dec 2006 Posts: 28 City: Panama City

Hi, I dont know anyone nearby who has an inboard boat to compare with. I want to know if there is a big difference on gas consumption between inboard and o/b. Lets say my 140hp yamaha o/b consumes around 20 gal in 7 hours wakeboarding. How much would a 5.7 L engine consume?[/b]

K-boarder · Newbie Joined: 04 Oct 2006 Posts: 14

In short about the same in the same sized boat. But there are alot of variables. If your yamaha is a 2-smoke you got to figure all that oil to.

nickl011 · Posted: Jan 17, 2007 6:43 pm Post subject:

i dont want to sound like an ass, but obviously a v8 would consume more. v8 r always gas guzzlers because of more cylinders. an o/b has less cylinders and would produce less power although an outboard is considerably lighter than a v8, so in some cases an outboard could be faster. if ur going for wake size which would make sense, go with an inboard, it depends on wat ur budget is Cool

K-boarder · Newbie Joined: 04 Oct 2006 Posts: 14

[quote="LFPIMP"]i dont want to sound like an ass, but obviously a v8 would consume more. v8 r always gas guzzlers because of more cylinders. an o/b has less cylinders and would produce less power although an outboard is considerably lighter than a v8, so in some cases an outboard could be faster.quote]

I here what your saying and your right in a way. But older carburated outboards are far less efficient than a four stroke I/O. The smaller outboard will have to be run much harder to get the same results. A full day of boarding on my buddys SN2001 will burn about 20 gals.

rappleby99 · Newbie Joined: 30 Dec 2006 Posts: 28 City: Panama City

Thanks for the info guys. Yes, my first though was that a 2-stroke 1.7L o/b consumes a lot if you compare it to a 4-stoke i/b with same engine size (proportionally).
Is the SN2001 a V6 or V8, whats the displacement of motor. It seems that consumption is similar to my o/b.

And yes... I want to change to an i/o. Maybe a 3.0 L mercruiser, I was just afraid that it would consume twice as much as my 1.7 L o/b.

K-boarder · Newbie Joined: 04 Oct 2006 Posts: 14

jjaszkow · Posted: Jan 18, 2007 12:24 pm Post subject:

The SN2001 is a V8 boat. I think that it comes with either a 351 or 454, but there might be other options as well.

If your are doing 20 gals a day with your o/b, you might even see an improvement going to the 3.0 L mercruiser. Given the choice, I'd personally choose the SN2001 or another inboard over an I/O, but there are a variety of reasons to choose either way (what are you using the boat for, budget etc etc).

nickl011 · Posted: Jan 18, 2007 2:47 pm Post subject:

the motor is most likely to be a 351, cuz thats a ford powerplant, and i think correct craft used fords back in the day

jjaszkow · Posted: Jan 18, 2007 8:21 pm Post subject:

You are correct that most of them came with a 351W, but I am pretty sure that the 454 was an engine option in those boats as well (there were probably others, but those are the ones that I am aware of). There are some SN2001 experts on this board which would know better than I would.