Gas mileage

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jap545

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I have a 96 V21 with the same year 150 johnson. The boat gets very poor gas mileage. I'll go on a 10 mile day and burn 25 gallons or so. speed wise it's great out of the hole but cruises at about 22 knots at around 4300 rpm. kind of disappointing. Does this sound normal for the engine. I'm more concerned about the gas. Could It be the wrong prop maybe? any insight would be appreciated.
 
That year 150 was pretty thirsty, but 10 miles and 25 gallons is pretty bad unless it's a 30 foot go fast. How many hours will you run the engine to burn that much? What is your wide open RPM's?
 
I'm gonna say It takes me about 35 minutes to the inlet. when i get there its 3 to 4 hours of start up and shut down to set up on new drifts and to move around the area. Then another 35 minutes back. the trip is about 10 miles roundtrip plus changing positions around a local area in the bay. Just bought it last year i think it topped at about 5600 or so. not positive. I am going on memory from last season. I cruise this trip at about 4300 rpm.
 
Do you smell any fumes esp. when you fill up? Maybe you have a fuel leak??

Get the numbers off that prop and report back. ;)
 
1/2 mile to a gal!! :o

I have a 88 175 Evinrude and get like 2 1/2 to 3 miles a gal, for a ten mile trip I would use less the 5 gal!

I hate to say it but you have a leak or something some were!

Do you smell fuel at all?

Do you see oil slicks in the water around your boat?

Have you checked the foam around your gas tank for fuel?

Hows the motor run?

Do you foul plugs quick?

Something is not right in Demark!
 
That is poor . I have a 150hp and cruise around 27mph@35-3600rpms. I think that you have a problem somewhere . On the Wellcraft site there is a place where they posted the test results with a 150 . Try this link and look under product info and click on 1993 V21 .
http://www.wellcraft.com/
 
@4300 that 150 looper is burning close to 14-15 GPH. So a 35 minute run will consume roughly 8.2 gallons one way plus another 8.3 gallons the other way. Let's say conservatively you use 3-4 gallons in your start ups and shut downs while drifting, you come out to roughly 20 gallons used. Your 35 minute run one way yet ony 10 miles total for the day doesn't add up though. It wouldn't hurt to check for leaks, fuel slicks while idling. But it sounds like your off on your distance a bit. It also sounds like your propping is, my V-20 with an OLD 1.6L sea-drive cruised close to 20 @ 3800-4000.
 
My brother has a 1996 150 evinrude Looper on a 20ft CC . . . just like that motor and it's the biggest pig. He's got a flow scan hooked up and at 4000rpm it's burning about 14gph . . . he recently put on a new prop (17pitch viper), so the motor will rev 5300rpm range at WOT and that's made some difference. But in general that motor drinks fuel.

By comparison my 2.4L Merc gets over 3mpg at a 35mph cruise 4000rpm and I have the big venturi carbs (wh-22's with no vent jets). I don't know why those motors are so awful on fuel, but they are very reliable and well built.

I believe MJ's motor is a crossflow design which is similar to the Yamaha (what yamaha copied/stole for their nearly indestructible 2.6L motor).
 
jap545 said:
 I have a 96 V21 with the same year 150 johnson. The boat gets very poor gas mileage. I'll go on a 10 mile day and burn 25 gallons or so. speed wise it's great out of the hole but cruises at about 22 knots at around 4300 rpm. kind of disappointing. Does this sound normal for the engine. I'm more concerned about the gas. Could It be the wrong prop maybe? any insight would be appreciated.
Click to expand...

:o

HOLY CARP!!!! I used to get 1 mpg in my GW 25 with twin 200 Evinrudes.......something is definately wrong.

I suggest a Johnzuki 140 to cure your gas comsumption woes. ;D
 
Yeah, my boat with a dud cylinder was doing better than that. Last time out we probably went 15 miles and burned 10 gallons and were on and off plane a lot. Darn 8 cylinder engines are so smooth, you don't even feel it when a cylinder drops off the line.
 
The 60 degree V-6 loopers are argued to be the best JOHNNY-RUDE ever built for longevity, durability, and reliability. But they are also argued to be some of the thirstiest engines ever as well with fuel consumption numbers right in line with those of the bigger 90 degree V-6's, and consuming 50% more than comparable loopers from other manufacturers. The older cross-flow engines were pretty thirsty as well though.
 
Before I repowered, my ol' '86 Gas-Suckin' 150 Rude drank some gas, but not what you describe...if yer not handy w/ outboards, find a good OMC Tech ;) ...
 
I just fueled today. 32 gallons for 19 hours of run time.
The trip log said 101 miles, But trolling in the stream twists the miles over ground that the gps reads. Running south into the stream I run an extra four miles every hour.

Tide and drift boys.
 
You did take the boat OFF the trailer before you went fishing didn'y you. I'll run 40 to 50 miles a day and burn maybe 20 gallons, I'm not kidding, Oz and Willy will confirm. I have a 150 yamaha 4 stroke.
 
Franco, is that all you get with a 4 stroke 150. i was wishing i had one but your only getting 2/2.5 mpg. i get that with a 13 year old merc.
 
Little Miss Piggy

wellcraft1_sized.jpg
 
I was being very hard on it, Reel sez my boat makes gas, I filled up the boat when Oz and willy came down, we fished 2 days, all day. One day was outside, one day was inside, probably put 14 hours on the boat those two days, I have fished 3 times since then and put in 50 bucks worth @ 2.85 a gallon and still have well over 3/4's of a tank (80 gallon capicity) It makes me crazy cause it seems to use so little fuel, I haven't even tracked usage closely at all. I usually put in $20 buck worth whenever I go fishing. When I run out to the fishing grounds ( bethel shoals) it's like 17 miles from the inlet, I troll around all day, I don't think it's been below 1/2 a tank since the day I took her home.
 
snoozer has the 140 suzuki/johnson and according to his numbers he is getting 3.35 mpg, and some of that is trolling. that is a great mpg, i would love to avg that, but it is hard to justify a $12000 investment to gain 1 mpg. i am refering to repowering for the sake of gaining gas mileage. if your ob pukes and your are forced to repower, then it might be a different story. given these numbers, i think you'd be better off getting a 2 0r 3 year old 2 stroke.
 
I get around 5 mpg with my Johnzuki 140 on the V. It varies with the seas, but the worst I have gotten is 4 mpg, that was running in 4-5 footers.

I have seen a couple of 140's on the internet lately for 6500-7000 for new/old models.
 
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