Single VS Twin

[lost2a6]

I have a single 200 Yamaha on my 23 Sceptre now and I have acquired another 200 Yamaha the same year, which is also, a counter rotating engine. I'm thinking about taking the bracket off of the boat and installing twins on the transom. My question is, how bad do you think that my fuel mileage will suffer from doing this?

[SECF3114M73J]

Just a guess, maybe you'll use twice as much gas. [img]/images/graemlins/blush.gif[/img]

[peterb]

I have twin 1998 Yamahas on a 23 SF.

I am probably averaging somewhere between 1.5 and 2 miles per gallon (if 2).

If I had a single 225 or 250 carb engine I would proabably average 2 to 2.5. Just a guess.

Another thing to consider, two engines = twice the weight in the rear. I only bring it up because I feel it when I am drifting in heavy seas and the stern is getting hit by waves.

[lost2a6]

Actually the weight is what I want, as my boat sits bow heavy at rest. Right now I get 2.3-MPG. I have pretty much talked my self out of going with twins. I really hate the idea of when it comes time to repower, having to buy two engines instead of one. [img]/images/graemlins/ooo.gif[/img]

[Fishjack]

PeterB
Your correct - on my 23 CC with a single 1998 Yamaha 250hp OX-66 I get an average of 2.5 mpg. My Flowscan reads 12-13 gph at 43-4400 rpm - that is cruising at 33-35mph (depending on load).

When new at WOT I saw a max speed of 53mph (just me, very little fuel, trimmed all the way up turning 57-5800 rpm) Fish ready with 3 guys on the boat I top out at about 46-47mph (burning 27-28 gph)
I like the economy (initial investment, maint., fuel and oil) of a single but it's hard to beat having a spare on the stearn for a ride home in the event of engine trouble.

Not sure if it would be worth the investment in a new bracket, controls etc. - If I were in your shoes I might save the motor as a spare and stick to the single.

What performance numbers are you seeing now with the single 200hp?


FJ

[ocuyler]

Having heard the story behind Lost2a6 name, I can certainly understand your interest in twin 200's. It's important to keep up your reputation.

Normally, I would suggest that you stick with the single and use the other motor as back-up. However, Since it's just conveniently sitting there... I'd look at the cost of installing it and see how much cash I had. If I had the money - I'd probably do it. But that's just me.

Best of luck with your choices.

[John R]

I would recommend you dump your boat on me for a couple grand, go find one of those twin I/O Scepters and dump a pair of exhaust driven 3.8s in it [img]/images/graemlins/laugh.gif[/img] . You already have the black vents that look like the fender vents of a GN/X. You'll have to add a couple of LED boost bars to the guage panel, paint it black, and change the decals to SC/X

[lost2a6]

I would recommend you dump your boat on me for a couple grand, go find one of those twin I/O Scepters and dump a pair of exhaust driven 3.8s in it [img]/images/graemlins/laugh.gif[/img] . You already have the black vents that look like the fender vents of a GN/X. You'll have to add a couple of LED boost bars to the guage panel, paint it black, and change the decals to SC/X

[img]/images/graemlins/grin.gif[/img] [img]/images/graemlins/grin.gif[/img] Actually that has crossed my mind. [img]/images/graemlins/wink.gif[/img]

[John R]

[img]/images/graemlins/grin.gif[/img] [img]/images/graemlins/grin.gif[/img] Actually that has crossed my mind. [img]/images/graemlins/wink.gif[/img]

What dumpin' the boat cheap to me or the 231s [img]/images/graemlins/cool.gif[/img]

It would be interesting though, about as light as twin straight sixes, water cooled...

[lost2a6]

Either/or. [img]/images/graemlins/smirk.gif[/img] It would be doable. However I would imagine that the boost would have to be cut back some, being that the GN engine wasn't designed to be ran under such a load for an extended period of time. Still would defiantly be interesting.