1. Props

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

   Discussions:

   544

   Messages:

   6,446

   

   Latest: Help & ideas for easy steering Vietnamese style longtail engine / prop (to heavy operation) Adler, Jan 9, 2026 at 1:00 AM

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2. Surface Drives

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

   Discussions:

   186

   Messages:

   2,866

   

   Latest: 8 ft model boat needing surface drive options portacruise, Dec 3, 2025

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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:

   1,050

   Messages:

   10,195

   

   Latest: What is this heckin part? DogCavalry, Dec 5, 2025

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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:

   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:

   541

   Messages:

   5,044

   1. Gas Engines (link)

   2. Diesel Engines (link)

   

   Latest: Simple thrust bearing systems still available? philSweet, Jan 15, 2026 at 8:30 AM

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8. Diesel Engines

   Diesel Engines

   Discussions:

   695

   Messages:

   8,701

   

   Latest: Efficiency vs Effectiveness A L F, Dec 13, 2025

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9. Gas Engines

   Gasoline Engines

   Discussions:

   424

   Messages:

   4,654

   

   Latest: How to Measure the Timing Chain-VOLVO engine 5.7GXI gonzo, Nov 19, 2025

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10. Electric Propulsion

    Electric propulsion systems

    Discussions:

    111

    Messages:

    2,190

    

    Latest: Greenline 33 All electric -Norway Adventure MotorCityBW, Dec 8, 2025

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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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