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    • Cummins Marine Forum Topics
    • 6BTA5.9M 250 hp By-pass Aftercooler coolant ?

      This topic has 2 replies, has 3 voices, and was last updated byTony Athens 3 years ago

      December 30, 2020 at 10:57 pm Hi, I have a 40′ displacement vessel with one Cummins 6BTA5.9M, serial No 21022041, CPL 953 rated at 250 hp at 2600 rpm, my normal cruising speed is 7.8 knots at 1700 rpm which represents 99.99% of operation, anything above 1700 rpm burns a lot more fuel for very little change in speed for example 2600 rpm is 8.9 knots. The Aftercooler is coolant cooled, I think they are referred to as tombstone design. At 1700 rpm the charge air temperat…

      Started by: Doug Kirby in: Cummins Marine Engines

      2 Replies
      December 31, 2020 at 6:23 pm Doug, I think your “thinking” may be leaving out a couple of things………… Did you measure air temp just after the turbo and inside the manifold under the aftercooler? Not sure what one you are referring to with your 124F temp? But there must be a delta of some sorts. I do not agree that a cooler air temp fed to the engine under these circumstances will improve the BSFC ( which is “efficiency”R…

      Last Post by: Tony Athens posted: 3 years ago

    • Coolant tank design and corrosion

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 3 years ago

      May 23, 2020 at 8:43 pm I purchased a Murphy level switch gauge for a coolant tank I plan to make over winter here in New Zealand for my 6BTA 250 hp engine, this is to replace the original 1990 coolant tank and expansion recovery bottle system. The coolant tank I plan to be about 12 litres capacity (a litre is approximately a quart), the normal tank level will be 50% full, so I will have 6 litres of draw down available and 6 litres of expansion capacity of which I hav…

      Started by: Doug Kirby in: General Discussion

      1 Reply
      May 24, 2020 at 11:19 am Your plan sounds fine but not sure why you feel you need to run a 50%.. IMO, 80% would be better, but you may have a reason that I do not understand. Don’t worry about rust–Use good coolant . If on the engine be sure the mounting/bracketing is designed right. Use a 3/4″ ID make up line on the bottom, properly placed vent lines that feed the top, and a applicable pressure cap rating depending on the height of the coolant l…

      Last Post by: Tony Athens posted: 3 years ago

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