Fuel consumption - Page 3

hangbelly · #21 09-25-2007, 02:03 AM

randleman what engine you runnin to get milage like that? and what happened to your stars and posts? I thought you were all fixed up.?

randlemanboater · #22 09-25-2007, 11:20 AM

I have a 2003 Johnson 140 4 stroke (same as a Suzuki).

I am fixed.........well, my profile is fixed.

hangbelly · #23 09-26-2007, 01:09 AM

Thats very impressive fuel mileage. Are the Johnsons the same dough as the Suzuki's? I havent seen anyone with a Johnson out here but I am starting to see a few more of the suzukis. I hear they get up and move better than most and they are high maitenence. Any truth to those rumors?

randlemanboater · #24 09-26-2007, 11:03 AM

I have run mine for 4 seasons now, I have changed the oil 3 times.

This winter I will probably put in a new waterpump just because.

I pull skiers w/ no problem, top speed is 39-40.

As for price, I haven't looked lately, 4 years ago mine was 9K for everything, motor, controls, prop, monitoring unit (idiot lights), wiring harness, tax.

I have been very pleased with mine.

Hammerhead · #25 10-11-2007, 01:06 AM

Finally figured out I get about 6 miles a gallon @ 3100 rpms....or about 26 knts.

tsubaki · #26 10-15-2007, 08:36 AM

Slowly narrowing the bugs in the boat, now I'm concentrating on the engines performance while in water.
Right now I need to clean (or rebuild) the carbs and check timing cause it's running way rich, to the point of fouling the plugs.
Photo of fuel consumption at 31mph and rpm. *:-[

New plugs with 30 minutes run time on them (after being wiped off with a wrag).

It will quickly do 41mph at 5000rpm (and draw 22.5gph).
I was expecting about 8gph at 30mph.
We'll see when done with the adjustments if it improves. :-/
By the way this wasn't at best trim, speed, etc, etc.
We were just trying the motor's reaction to various circumstances. I'm sure the numbers would have been a little better by picking the best operating range (which was what I was trying to do till it started fouling the plugs).

Airslot · #27 10-15-2007, 09:41 AM

Differnt critter all together, but for refernece, my 88 Merc 150 burns a little under 8 ghp at 4k getting 28-29 mph.

'Slot

tsubaki · #28 10-15-2007, 06:26 PM

I'm sure (hoping) these numbers are way out of wack but felt they needed posting in case someone seen or knew something I didn't.

phatdaddy · #29 10-15-2007, 11:08 PM

if your burning 13.2 gph & doing 31 mph, that's approx 2.3 mpg right. my 95 150 mariner gets 2.3-3.0 depending of load & seas. i don't have a fuel gauge, i just fill up & set the odometer on the gps. if i go 70 miles, it always takes 30 -35 gallons to top it off.

THEFERMANATOR · #30 10-16-2007, 12:30 AM

Hey tsubaki, those fuel burn numbers aint all that bad for a cross-flow JOHNNY-RUDE. Clean your carbs and try running some standard style plugs in her, those surface gap plugs are for extended high RPM usage. They are notorius for fowling at low RPM's for no apparent reason.

And if you want to talk about a fuel hog, I can bring my flats boat with the XRI MERC into the discussion. All I'll say is she LIKES FUEL!!!! But god will she jump on plane in a hurry and run shallow ;D.