3200SCR Range/MPG

[PANDA]

I never really tried to calculate gas mileage or range but what should I expect here? Obviously all boats are different and this can depend on many different things.

[mmwjr]

Yes like starting with what engines do you have?

5.7 (350) will burn 8 - 10 gallons per hour each at ~3000 rpm
7.4 (454) will burn 12 - 15 gallons per hour each at ~3000 rpm

Boat size and amount of weight on board, people and gear have an impact

[AlwaysSober]

Originally Posted by mmwjr

Yes like starting with what engines do you have?

5.7 (350) will burn 8 - 10 gallons per hour each at ~3000 rpm
7.4 (454) will burn 12 - 15 gallons per hour each at ~3000 rpm

Boat size and amount of weight on board, people and gear have an impact

What speeds are you running at those rpms?

My 740s plotter and fuel sensors said that I was burning between 0.9 and 2.0 gph running on one 350/4 bbl turning a 19 pitch B2 prop at 1900 rpm. Please don't ask me how I know this

[biggerseagar]

Boating proverb...........The first thing I was told long long ago by a very wise boater was never go by the gas island on a long trip no matter what the gas gauge says without filling up......and you will never run out of gas:-)

[mmwjr]

AlwaysSober, are you sure you don't mean 2.0MPG and not GPH? Else let us in on your secret, run all day (5 hours) and only burn 10 gallons WOW.

[pascavone]

he is correct, if he is running 2- 350/4 bll @ 1900 rpm.... means he's doing 5 mph...!

[AlwaysSober]

Originally Posted by pascavone

he is correct, if he is running 2- 350/4 bll @ 1900 rpm.... means he's doing 5 mph...!

Actually only one 350 4 bbl. And we were clipping along at a whole GPS verified 6.5 mph, thank you very much :-)

[mmwjr]

Ok, at the 3000 rpm I mentioned theboat is on plan and depending on it's size and load would be doing ~25 mph which is cruising speed. At 1900 rpm my boat would be nose high trying to get on plane and getting really bad mileage. To get an idea on what different boat sizes with different engines do I look at boat test in magazines to review their test results which include mpg along with the speed achieved and rpm.

[AlwaysSober]

I don't think our 3200 SCR will stay on plane at 3000 rpm. The boat seems to like to run at 3700 rpm. I leave the trim tabs up and trim the drives up slightly.

The reason I was getting good milage was because I lost one engine and was limping back home. Fortunately it was a very nice day and we did not have to be back at a particular time.

I think I was getting around 1 mpg last month. FWIW, there were a couple other 3200s were we were docked over the weekend. The one guy said he once got 1.25 mpg.

The 3200SCR has a 182 gallon fuel tank, but on big water, you should leave 1/3 of the tank as a reserve in case you hit some bad weather.

[mmwjr]

I am surprised that the boat won't plane with twins at 3000 rpm but I have never had a boat of this size.

So at 3700 rpm how much are you burning?

[AlwaysSober]

Had the electronics installed this year and haven't had the boat out much since. Last month I believe the plotter was reading 14.4 gph per engine, so about one mile per gallon.

Our 350 MAG B3 2400 SC3 cuddy cruises nicely at 3000 rpm! The big B2 dives have to push 240 lbs of batteries, 1600 lbs of fuel and water, plus all coolers and the "stuff" above the water line. First year on Lake Michigan, so I have a lot of dialing in to do once I get all this stuff fixed.

[mmwjr]

Sounds in line with what I originally said

[ezcurra]

We have 98 3200SCR with twin 5.7L turning Bravo IIs. We get a pretty constant 1 mpg at "normal' cruise - the boat seems happiest at about 3300 rpm going 25 mph.

[shrew]

What we really need is the year and size of the engines. Technically, it's very difficult to 'guess' at what fuel consumption would be. The length, wideth, and shape of the hull, the dirves, gearing and prop pitch as well as current, tide and sea state all impact performance.

One thing to note, the OP has not piped in since the thread was started so......who are you guys debating with??

[mmwjr]

Yea Shrew I noticed that as well but this one just turned into sport for me

Gotta have some fun once and a while

[PANDA]

I usually cruise at ~25mph 3800rpm's

Twin 5.7's - slight bow down trim.

[AlwaysSober]

No debate. It's helpful to get info as what the "sweet spot" is for this popular cruiser.

Mine blew a plastic power steering pulley on one engine and I limped it back on one engine, but got great MPG.

We can adjust the throttles, trim tabs and drive trim. Sea/lake conditions and weight distribution will have change things up, but being a newbie to continuous cruising, I'd like to know where that "sweet spot" is under normal conditions.

Hopefully this weekend I can see if I can get the big boat to stay on plane at 3300 rpm. It's a lot easier to pilot our faster, trailerable 2400 SC3 cuddy than the 3200 SCR, but the cruiser has some advantages as well.