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Thread: engine displacement???

  1. #1
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    Default engine displacement???

    i just bought my first river boat. it is a 16ft Lowe tunnel hull with a 1998 Johnson jet. there are no decals on the engine and i was told it was 30hp by the seller. i just wanted to know if it was 30hp at the power-head or 30hp at the jet?? it says on the engine tag that the engines displacement is 45. so would it be a 50hp power-head with 30 at the jet??? also the model number is j30jreem if that helps anybody out. thanks for your help.

  2. #2
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    Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre.

  3. #3

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    Based on the Johnson model number "j30jrem", it is a j=Johnson, 30=30hp, j=jet. Just based on the model number you provided, it should be a 30hp Johnson but I can't say for sure whether they tagged them with the hp at the head or jet since they knew it was a jet unit.??

  4. #4

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    Outboards that are bought new with jets are marked with the jet hp, not the powerhead. I had a honda 65 jet, which was actually a 90 hp.
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  5. #5

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    What you have there is a 40/30 jet.

  6. #6
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    Default

    Thanks everyone for answering my question. I was getting worried that I wouldn't have enough power to push my boat and gear. But with a 30hp at the jet I should be okay. I'm taking her out tomorrow on the knik to see how it rides.

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