3116t cats and fuel consumption

[edbulmer]

I have 3116t cats and have a 41 Silverton and need to due some travelling. I'm told different stories on fuel consumption. I'm in no hurry so would I have better fuel consumption going 6-7 knots or going at speed required to get on plane. Manufacture is saying 2400 rpms.

[Sailmonkey]

To get on plane requires a lot more horsepower, so you'll burn a lot more fuel. To be efficient you need to slow down to displacement speed or a little less

[djmarchand]

6-7 kts is well below displacement speed for that boat, so it should use very little fuel, may be 2-3 gph. That may be too little for those engines to get up to operating temperatures. I would suggest 7-8 kts and burn 3-4 gph.

David

[motion30]

I.have.a pair of.320 hp 3208 t. At. 7 knots I burn a total
of 4- 5 gallons per hour. At 2200 rpm. closer to 20 gph. 44' sundeck

[edbulmer]

That's what I thought. I have Detroits on my Viking and they use very little fuel at slow speeds. I'll take it slow and give them a good run a few minutes every other day.

[shakey doug]

G'day,
3116t @ 2400 cruising rpm expect at least 12-15 gph con each unit, dropping to 5-6 gph @1400 rpm which should give you 6-7 kts.