Propulsion

Discuss marine engines, drives, and propulsion systems.

  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
    RSS

  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
    RSS

  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
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,044
    Messages:
    10,061
    Latest: OXE Diesel Outboard Experiences? comfisherman, Jun 2, 2025
    RSS

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

  6. Pod Drives

    Volvo IPS, ZF, CMD Zeus, and other pod-drive systems
    Discussions:
    29
    Messages:
    299
    Latest: 50-200 hp electric pod with nozzle and motor on hub? ram68ocean, Jul 5, 2021
    RSS

  7. Inboards

    Inboard and Vee-drive hardware: struts, stuffing boxes, transmissions, coolers
    Discussions:
    540
    Messages:
    5,009
    Latest: Velvet Drive CR2 drop center gear. Carteret, Jun 21, 2025
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    691
    Messages:
    8,624
    Latest: 38' 1984 posillipo technema with Fiat Iveco diesel engines question comfisherman, Jun 6, 2025
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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
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,275
    Latest: Hydraulic Drive for max efficiency Rumars, May 6, 2025
    RSS

  12. DIY Marinizing

    A forum to discuss "do it yourself" marinizing of engines / conversion of automotive engines to marine use.
    Discussions:
    276
    Messages:
    5,577
    Latest: VW/AUDI 3.0TDI marinising Skravo, Aug 18, 2024
    RSS
Page 1 of 25
Sort By:
Title ↓ Start Date
Replies Views
Last Message
  1. nicste

    ZF 80 model

    nicste, Feb 20, 2012
    Replies:
    0
    Views:
    2,468
    nicste
    Feb 20, 2012
  2. Mark Emaus

    ZF 15MA Transmission

    Mark Emaus, Apr 10, 2009
    Replies:
    0
    Views:
    2,186
    Mark Emaus
    Apr 10, 2009
  3. CAPTAIN AHAB

    Z Drive

    CAPTAIN AHAB, Feb 22, 2008
    Replies:
    5
    Views:
    7,655
    riggertroy
    Feb 23, 2008
  4. alexlebrit

    Yet Another Silly Human Powered Propulsion Idea

    alexlebrit, Jul 1, 2007
    Replies:
    4
    Views:
    3,471
    stonebreaker
    Jul 1, 2007
  5. WestVanHan

    Yet Another New Type Of Engine..

    WestVanHan, Jan 21, 2012
    Replies:
    5
    Views:
    3,314
    Boston
    Jan 22, 2012
  6. hilux38

    yanmar 6lp-stzp 315hp

    hilux38, Dec 6, 2004
    Replies:
    3
    Views:
    5,940
    hilux38
    Dec 7, 2004
  7. Chuck Bates

    Yamaha wins dumping case

    Chuck Bates, Feb 2, 2005
    Replies:
    0
    Views:
    3,901
    Chuck Bates
    Feb 2, 2005
  8. DCockey

    Yamaha acquires Torqeedo

    DCockey, Jan 19, 2024
    Replies:
    5
    Views:
    2,635
    Paul Scott
    Jan 24, 2024
  9. ocean dreamer

    Yachting propulsion systems

    ocean dreamer, Sep 2, 2018
    Replies:
    4
    Views:
    2,462
    JamesG123
    Sep 2, 2018
  10. Economacki

    Won't start when warm

    Economacki, Jul 13, 2005
    Replies:
    7
    Views:
    13,583
    tdomi2
    Oct 12, 2006
  11. tomjohnson

    Won't go out of neutral

    tomjohnson, Oct 14, 2008
    Replies:
    1
    Views:
    2,448
    CDK
    Oct 14, 2008
  12. boarding bob

    Wind Turbine Boat

    boarding bob, May 20, 2015
    Replies:
    4
    Views:
    4,206
    boarding bob
    May 21, 2015
  13. Cloxxki

    Wind powered ground effect boat/craft

    Cloxxki, Jun 23, 2010 ... 2
    Replies:
    17
    Views:
    15,166
    Cloxxki
    Jul 16, 2010
  14. samhales

    WIll This Work ??

    samhales, Dec 26, 2006
    Replies:
    2
    Views:
    2,527
    samhales
    Dec 28, 2006
  15. sdowney717

    will a severely barnacled hull prevent engine from reving up to full speed?

    sdowney717, Oct 7, 2012 ... 2
    Replies:
    24
    Views:
    11,909
    jonr
    Oct 10, 2012
  16. SudorracMechEng

    wiggle drive propulsion application

    SudorracMechEng, May 7, 2012 ... 19 20 21
    Replies:
    304
    Views:
    57,921
    swashdrive
    Aug 17, 2012
  17. navy boi

    Why so much slip?

    navy boi, Mar 17, 2005
    Replies:
    11
    Views:
    4,833
    Karl2
    Apr 19, 2005
  18. kalel76

    Why is my gas gauge stuck on E? (pics)

    kalel76, May 2, 2007
    Replies:
    4
    Views:
    34,090
    Frosty
    May 4, 2007
  19. Pevito2

    Why does an I/O engine needs to operate at 140-160F

    Pevito2, Mar 30, 2006
    Replies:
    3
    Views:
    3,183
    blowhole
    Apr 5, 2006
  20. piping-hot

    Which outdrive?

    piping-hot, Sep 22, 2004
    Replies:
    0
    Views:
    3,542
    piping-hot
    Sep 22, 2004
  21. Doomslayer

    Which outboard for 17 ft pedro with 19" transom?

    Doomslayer, Jan 26, 2012
    Replies:
    5
    Views:
    3,797
    Mr Efficiency
    Jan 26, 2012
  22. the big jetski

    Which Jacuzzi to install in my Boat?

    the big jetski, Dec 10, 2005
    Replies:
    4
    Views:
    4,259
    the big jetski
    Dec 14, 2005
  23. Aberdeen

    Which Hydrofoil ?

    Aberdeen, Jan 19, 2006
    Replies:
    2
    Views:
    6,011
    Aberdeen
    Jan 19, 2006
  24. a3eyedfish

    where to pruchase carb parts.

    a3eyedfish, Mar 10, 2005
    Replies:
    1
    Views:
    4,505
    ChillrMn1
    Mar 15, 2005
  25. michael smith

    wheel size

    michael smith, Jun 7, 2019
    Replies:
    7
    Views:
    2,583
    jehardiman
    Jun 9, 2019
  26. oneboatman

    wheel chair v. deep cycle

    oneboatman, Mar 8, 2007
    Replies:
    5
    Views:
    13,808
    lazeyjack
    May 15, 2007
  27. Willallison

    What's This??

    Willallison, Oct 16, 2005
    Replies:
    7
    Views:
    3,233
    gasdok007
    Oct 31, 2005
  28. MONJI

    What's the function of pumps?

    MONJI, Sep 12, 2006 ... 2
    Replies:
    16
    Views:
    17,807
    bilgeboy
    Sep 14, 2006
  29. MONJI

    What's the function of Drivelines?

    MONJI, May 13, 2006
    Replies:
    5
    Views:
    4,751
    Wellydeckhand
    May 14, 2006
  30. Magnus W

    What source for electric energy in a hybrid system?

    Magnus W, Dec 20, 2018 ... 2
    Replies:
    23
    Views:
    4,751
    Christian Lucas
    Jan 25, 2019
  31. howard_khoo

    What kind of prop that make the most turbulence?

    howard_khoo, Mar 9, 2005
    Replies:
    1
    Views:
    3,977
    Ssor
    Mar 20, 2005
  32. Hunterr

    what is the bobtail of engine?

    Hunterr, Apr 10, 2016
    Replies:
    2
    Views:
    13,255
    JSL
    Apr 10, 2016
  33. Canaduke

    What is a Surface Drive and a V drive?

    Canaduke, Apr 8, 2007
    Replies:
    5
    Views:
    25,773
    Canaduke
    Apr 9, 2007
  34. jalexfolds

    Went to Change plugs in Inboard, water came out, What Now?

    jalexfolds, Dec 15, 2004
    Replies:
    2
    Views:
    4,026
    Richard Petersen
    Dec 16, 2004
  35. gonzo

    Weirdest propulsion system

    gonzo, Jan 12, 2010 ... 2 3
    Replies:
    43
    Views:
    15,500
    dieseldude
    Jul 14, 2010
  36. Willallison

    Weight of Volvo Penta D6

    Willallison, May 3, 2005
    Replies:
    2
    Views:
    5,598
    Willallison
    May 3, 2005
  37. wake711

    weedwacker? will it work

    wake711, Sep 5, 2004
    Replies:
    2
    Views:
    3,239
    Dutch Peter
    Sep 6, 2004
  38. rwatson

    Wave Propulsion used in 5000 miles cruise

    rwatson, Jul 6, 2008
    Replies:
    4
    Views:
    3,457
    FAST FRED
    Jul 9, 2008
  39. Paulc

    Wave propulsion

    Paulc, May 26, 2014 ... 2
    Replies:
    15
    Views:
    7,851
    kjell
    Jan 22, 2015
  40. kjell

    Wave propulsion

    kjell, Jun 25, 2011
    Replies:
    6
    Views:
    3,960
    jehardiman
    Jun 26, 2011
Showing threads 1 to 40 of 985

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