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    • Cummins Marine Forum Topics
    • Reduction ratio

      This topic has 5 replies, has 4 voices, and was last updated bydvm004 5 years ago

      April 24, 2019 at 3:22 pm Hello, new member with a question about choosing a reduction ratio for a zf 220a for a cummins 6bt. My son and I are repowering a 66ā€™ webber cove 34ā€™ lobster boat that weighs about 16k lbs. She cracked a head on the old volvo penta tamd40 and we pulled it and junked it. We took our time and built a 6bt, with mild p-pump changes. mild 6bt, no aftercooler, 230/240hp engine. The 220a down angle matches perfectly to our 10 degree shaft curr…

      Started by: dvm004 in: Marine Transmissions

      5 Replies
      April 25, 2019 at 3:20 pm Hi Rob, yes the shaft slid back from the original location. The nice wrap of braided line, looks like 50lb jbraid, is closer to where shaft sat. I will watch my clearances for the exhaust, the front of the volvo sat significantly higher than the trans due to the in line install. I am hoping to remedy this with the offset zf. This is a pic with volvo/velvet drive gone.

      Last Post by: dvm004 posted: 5 years ago

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