[SPLASHED] I/O (Sterndrive) Conversion to Outboards

[Scott Danforth]

Ted, it's a boat..... Fuel economy is never a consideration

 

[redneck joe]

but knowing how bad you are being screwed is important...

 

[Pmt133]

Guy math means that's more beer in your hand vs the mercruisers

 

[jlh3rd]

funny, seems like I remember on here someone posting that 3500-3600 +/- rpm seems to be that sweet mpg for most boats. It actually is for my pontoon.

 

[tpenfield]

Ted, it's a boat..... Fuel economy is never a consideration

I often use the term ‘fuel usage’ rather than economy

 

[nola mike]

Performance update. . .

I have about 13 hours on the engines. I found a sweet-spot for fuel ️ usage. 3600 RPM & 30-31 mph gets 1.4 mpg. So, that is a win

The best I could do with the Mercruisers was 1.3 mpg.

If you go 100 miles/day every single day, you'll have paid for the conversion in only 10 years! (Winter too, no cheating)

 

[Scott Danforth]

I often use the term ‘fuel usage’ rather than economy

Fuel Burn is 0.5# of fuel per HP per hour.

 

[tpenfield]

Here is my fuel purchases this year for the boat . . .

I currently have about 55-60 gallons in the tank.


.
The Admiral get money off at the Stop & Shop Gas station for buying groceries.

That stop at the Marina was painful . . .

 

[alldodge]

I don't keep gas records but I've filled my boat up with Reg twice (about 70 gal each time) and 50 gal's once. Price was 5.25 to 5.45 for 87 Octane E0 at marina. My tank is 123 gal

 

[tpenfield]

I'm keeping records this year, since it is a new engine and boat configuration.

 

[Pmt133]

I just tossed 700 in the 330 and it isn't even close to half a tank.

 

[Scott Danforth]

Im thinking of growing corn to distill into my next batch of boat fuel.

 

[Pmt133]

The plant is basically an algae farm this time of year, been thinking about biodiesel... but I'm sure they'll find a way screw me on that too. Is government run after all.

 

[flashback]

Im thinking of growing corn to distill into my next batch of boat fuel.

Then just drink it while you sit in the driveway with the sprinklers on and pretend...

 

[Scott Danforth]

Then just drink it while you sit in the driveway with the sprinklers on and pretend...

Actually cut way back on the consumption.

 

[tpenfield]

Quick Update . . .

We may get to use the boat a couple more times, but our travel plans leading into the Fall will shorten our boating season.

I'll probably pull the boat in the next couple of weeks and do the following:

• Check engine height and raise the engines
• 20 hour servicing
• Winterizing (easy)

I have updated my project plan, which basically maps out the 10 months of the project. Some of the fine tuning will happen next year when we launch for the season. (Probably early June)
.

.

 

[tpenfield]

In other news . . .

the Shop Manual arrived !!!

 

[nola mike]

In other news . . .

the Shop Manual arrived !!!

View attachment 419382

Oooh, analog!

 

[Pmt133]

I'm impressed with the sticker. I ordered the whole set for my truck. (14,000 pages) and they didn't give me a sticker.