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I have recently bought a Seafarer Viking 5.5mtr glass boat which I will use mainly for fishing the northern bay area.I have been told that at cruising revs the Johnno 115 v4(carby,vro)will use around 1ltr per nm and more when the weather conditions aren't good.The boat has a 160ltr tank underfloor but I don't want to overfill her and have stale fuel sitting in the tank after a trip.Does anyone have the same or similar size rig/motor who can give me an idea of fuel consumption etc etc.Cheers! Jace.
Hi Jace
IMO you should fill the tank before every trip, cant think of any thing worse than working out you need 100l and finding out 10k from home ya needed 110l.
cheers
blaze
Keep the tank full and it will also minimise your condensation which if present can lead to water in the carbies if you don't have a good Racor type filter with clear bulb. That combo would be using more like 1km/Nm based on my experience of many hours in a Viking with a 115 Oceanpro. If you are worried about stale fuel use premium for some piece of mind. We just use normal unleaded and go for a couple of months at a time without use and it is fine.
Fill the tank and do your own experiment. Time your engine hours and what your revs were for a trip and then re-fill the tank and calculate your average usuage. I'd figure around 20-25 litres/hour in that rig at 4000-4300 rpm which should be your optimum cruising speed. Listen to the engine and you'll hear what sounds comfortable for it. This gives you an idea of fuel required, then always calculate that you will need to carry half that again in case you get some crappy weather. 160 Litres is plenty for that boat though in most cases. If you are worried about it then half fill the tank on smaller trips, carry extra fuel in a plastic jerry can and stick it in your car if you don't use it. A jerry can will just about get you home from Moreton most days unless you are completely out of fuel at Bulwer.
Thanks for the advice fellas it was well received-actually was chatting to one of the guys at Bribie VMR and he basically said exactly what you boys have advised so much appreciated and thanks to all.Cheers!.Jace.
Oh by the way just out of interest Aaron F you were right about the cruising revs,the Johnno 115 ocean runner seems to like sitting dead on 4000 rpm sort of gets quieter and smoother and gains about 500rpm once trimmed.I obviously don't have much(any)experience with boat engines but the Johnson doesn't seem to be the noisy,smelly 2stroke I was warned about when looking for a fishing rig.Jace.
No they are better than they used to be. Try running synthetic oil in it and you'll have even less smoke and no plug fouling at idle/troll speeds. Suzuki makes a great oil you can burn in any engine (haven't bought it in a few years so check first). Get us a shot of the boat as there are a lot of posts for this vessel of late and it might be nice for those interested to see inside and out. Cheers - Aaron
Thanks for the Suzi oil tip Aaron f-next fill I'll give it a whirl.Wanted to throw a pic or two up but my digi cam can only seem to take images of 117kb and up-needs to be 100kb or less apparently and buggered if I know how to resize 'em,anyhow I'll borrow an older cam and get some shots happening.Once again thanks for the tips.Jace.
Finally managed to resize some pics-harder than learning to fly the space shuttle!!-so for anyone interested in my expensive lump of fibreglass(which I'm assured will bring much pleasure,mind you they said that about the missus too!!)-here are some shots.PS:I've noticed she doesn't handle very well on land for some reason-maybe it's the 850kg!.Cheers.Jace.
Finally managed to resize some pics-harder than learning to fly the space shuttle!!-so for anyone interested in my expensive lump of fibreglass(which I'm assured will bring much pleasure,mind you they said that about the missus too!!)-here are some shots.PS:I've noticed she doesn't handle very well on land for some reason-maybe it's the 850kg!.Cheers.Jace.[img][/img]
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