1. Props

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

   Discussions:

   544

   Messages:

   6,463

   

   Latest: Help & ideas for easy steering Vietnamese style longtail engine / prop (to heavy operation) gonzo, Feb 5, 2026

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2. Surface Drives

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

   Discussions:

   187

   Messages:

   2,875

   

   Latest: Levi Surface Drive Sea Rider Customization BlueBell, Apr 13, 2026

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3. Jet Drives

   Jet Drives (pumps, impellers, etc.)

   Discussions:

   464

   Messages:

   4,478

   

   Latest: help castoldi 238 Laurence Bellamy, Dec 24, 2025

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4. Outboards

   2-stroke and 4-stroke outboard motors.

   Discussions:

   1,052

   Messages:

   10,242

   

   Latest: Merc 6hp 4 stroke fouls plug at high power SolGato, May 17, 2026 at 10:15 PM

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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:

   552

   Messages:

   3,882

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: Mercruiser Alpha 1 gen 2 gonzo, Oct 11, 2025

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6. Pod Drives

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

   Discussions:

   29

   Messages:

   302

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: hydraulic pod drive 30' displacement hull brian eiland, Feb 28, 2026

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7. Inboards

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

   Discussions:

   541

   Messages:

   5,052

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: Simple thrust bearing systems still available? Rumars, Jan 19, 2026

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8. Diesel Engines

   Diesel Engines

   Discussions:

   696

   Messages:

   8,716

   

   Latest: Cummins 6bta 375 hp william stokes, May 15, 2026 at 9:24 PM

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9. Gas Engines

   Gasoline Engines

   Discussions:

   424

   Messages:

   4,656

   

   Latest: How to Measure the Timing Chain-VOLVO engine 5.7GXI gonzo, Feb 5, 2026

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10. Electric Propulsion

    Electric propulsion systems

    Discussions:

    116

    Messages:

    2,225

    

    Latest: Mounting 5kw electric inboard mugball, May 10, 2026

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11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.

    Discussions:

    212

    Messages:

    5,294

    

    Latest: Real Hybrid fallguy, Nov 29, 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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