1. Props

   Propeller selection, performance comparison, prediction, experience, and modification.

   Discussions:

   543

   Messages:

   6,436

   

   Latest: Seeking Input for DIY Propeller Cleaning Tool – Master's Thesis Research Survey gonzo, Apr 29, 2025

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2. Surface Drives

   Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.

   Discussions:

   186

   Messages:

   2,864

   

   Latest: Is Levi Drives still in business? BlueBell, May 30, 2025

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3. Jet Drives

   Jet Drives (pumps, impellers, etc.)

   Discussions:

   463

   Messages:

   4,452

   

   Latest: drive for landing craft used on both ocean and rivers DogCavalry, Feb 10, 2025

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4. Outboards

   2-stroke and 4-stroke outboard motors.

   Discussions:

   1,045

   Messages:

   10,068

   

   Latest: Need help please 70hp Johnson Derrick O, Jul 9, 2025 at 1:11 AM

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5. Sterndrives

   Stern drive lower and upper units, transom and gimbal assemblies, steering, and trim pumps. Mercruiser (Alpha One, Alpha One Generation II, Alpha SS, Bravo One, Bravo Two, Bravo Three, Bravo XR Sportmaster, TRS, Speed Master), IMCO, ILMOR, Konrad, OMC, Volvo Penta

   Discussions:

   549

   Messages:

   3,839

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: Stern Powr Parts Laurence Bellamy, Aug 3, 2024

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6. Pod Drives

   Volvo IPS, ZF, CMD Zeus, and other pod-drive systems

   Discussions:

   29

   Messages:

   299

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: 50-200 hp electric pod with nozzle and motor on hub? ram68ocean, Jul 5, 2021

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7. Inboards

   Inboard and Vee-drive hardware: struts, stuffing boxes, transmissions, coolers

   Discussions:

   540

   Messages:

   5,009

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: Velvet Drive CR2 drop center gear. Carteret, Jun 21, 2025

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8. Diesel Engines

   Diesel Engines

   Discussions:

   691

   Messages:

   8,627

   

   Latest: Insight in diesel Luhrs 28 re-power 7228sedan, Jul 13, 2025 at 9:28 AM

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9. Gas Engines

   Gasoline Engines

   Discussions:

   423

   Messages:

   4,652

   

   Latest: Anyone need a torque monster 383 SBC? gonzo, Sep 24, 2024

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10. Electric Propulsion

    Electric propulsion systems

    Discussions:

    106

    Messages:

    2,119

    

    Latest: Sizing a propeller to match an electric motor gonzo, Jun 10, 2025

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11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.

    Discussions:

    211

    Messages:

    5,275

    

    Latest: Hydraulic Drive for max efficiency Rumars, May 6, 2025

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12. DIY Marinizing

    A forum to discuss "do it yourself" marinizing of engines / conversion of automotive engines to marine use.

    Discussions:

    276

    Messages:

    5,578

    

    Latest: VW/AUDI 3.0TDI marinising Radu Druncea, Jul 2, 2025

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