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Old 02-25-2020, 05:04 PM   #1
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6-71 fuel consumption

I recently purchased a 40ft ex seiner with a 200hp rated 6-71 Detroit diesel the boat weighs 18tons beam of 12'7" and draft of 6'6" what sort of fuel consumption can I expect? Thanks in advance
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Old 02-25-2020, 05:06 PM   #2
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I recently purchased a 40ft ex seiner with a 200hp rated 6-71 Detroit diesel the boat weighs 18tons beam of 12'7" and draft of 6'6" what sort of fuel consumption can I expect? Thanks in advance
I would think + or - 6 gallons /hr if you run 1700 Rpms
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Old 02-25-2020, 05:11 PM   #3
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Old 02-25-2020, 05:12 PM   #4
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Years ago we used to say 1 gallon per cylinder but they were rated 165 hp continuous
at 1800 rpm
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Old 02-25-2020, 05:14 PM   #5
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Thanks for all the replies!

What sort of speed would be the most efficient? I was thinking around 7kts?
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Old 02-25-2020, 05:27 PM   #6
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7kts and that engine is going to be working easy. My guess is 4gph at 7. Maybe 5-6gph at 7.5-8.
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Old 02-26-2020, 10:48 AM   #7
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Thanks for all the replies!

What sort of speed would be the most efficient? I was thinking around 7kts?
Depends on boat and how it's propped. EGT/Fuel Flow are your friend.
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