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Diesel Engine Fuel Consumption


I bumped into an old friend at the marina last week who showed me his brand new power boat a Sealine SC35 – wow what a boat. I do not – of course – approve of power boats – but I must say that sitting in the cockpit sipping champagne on a balmy summers evening was rather cool…

What struck me most was how beautifully modern it looked – not bling but chic..everything was still perfectly functional for seafaring but at speed – 34 knots to be precise!..all coming from 2 x 260hp diesel engines.

Being ever practical, and not being in the same oil baron league as my DSC01313sfriend – I got to thinking about diesel fuel consumption now that marine diesel is going to double in price. Exact consumption is hard to calculate since it depends not just on the power of the engine but also on the load and of course the weather and sea state. An excellent site – which you would have to read several times to follow is the Frontier Power Products Site, which has an excellent exposition on how to estimate fuel consumption.

What is interesting is that fuel consumption could be fairly flat for reasonably large ranges of rpm. or even have 2 or more bumps in the curve – it was not a simple case of more speed = more fuel…well good luck all you power boaters…rather you than me when it comes to filling up – on the other hand when it comes to mooring in the marina and sipping champagne – well – yes I would love to come aboard 🙂


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