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
    RSS

  9. Gas Engines

    Gasoline Engines
    Discussions:
    423
    Messages:
    4,652
    Latest: Anyone need a torque monster 383 SBC? gonzo, Sep 24, 2024
    RSS

  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 3 of 25
Sort By:
Title Start Date
Replies Views
Last Message ↓
  1. sdowney717

    Jabsco 4528 impeller pin, does it push or thread in

    sdowney717, Jul 3, 2018
    Replies:
    2
    Views:
    2,018
    sdowney717
    Jul 7, 2018
  2. 5teve

    Muffler Drains

    5teve, Mar 7, 2018
    Replies:
    9
    Views:
    3,455
    5teve
    Jun 25, 2018
  3. Israel

    Bayliner 2.3 turbo

    Israel, May 26, 2018
    Replies:
    10
    Views:
    3,508
    Israel
    May 30, 2018
  4. DSTONE

    OMC-Ford 2.3 trouble

    DSTONE, Aug 9, 2005
    Replies:
    4
    Views:
    13,939
    Israel
    May 26, 2018
  5. Tlray

    Water in the cylinders 4.3

    Tlray, May 19, 2018 ... 2
    Replies:
    15
    Views:
    12,838
    PAR
    May 22, 2018
  6. Upston

    Transmission ratios

    Upston, May 16, 2018
    Replies:
    2
    Views:
    2,297
    Upston
    May 21, 2018
  7. franklou

    motor and waterjet model

    franklou, Apr 17, 2018
    Replies:
    7
    Views:
    3,504
    franklou
    Apr 18, 2018
  8. PickleRick

    A little boat and a simple diesel project

    PickleRick, Dec 4, 2017
    Replies:
    5
    Views:
    3,128
    gonzo
    Mar 12, 2018
  9. xellz

    Saildrive or shaft with electric motor

    xellz, Feb 10, 2018
    Replies:
    2
    Views:
    4,736
    xellz
    Feb 11, 2018
  10. Singleinboard

    1973 Silverton Replace V Drive

    Singleinboard, Jan 8, 2018
    Replies:
    3
    Views:
    4,535
    PAR
    Jan 9, 2018
  11. 91SARATH

    Propeller design

    91SARATH, Dec 14, 2017 ... 2
    Replies:
    27
    Views:
    8,787
    gonzo
    Dec 19, 2017
  12. Archangl7

    electric motor outboard conversion

    Archangl7, Aug 5, 2017 ... 2
    Replies:
    16
    Views:
    12,062
    HMLee
    Dec 1, 2017
  13. xellz

    Advice on shaft, seal, bearings for wooden kayak

    xellz, Nov 26, 2017
    Replies:
    8
    Views:
    4,091
    xellz
    Nov 29, 2017
  14. Carter Beall

    electric hydrofoil

    Carter Beall, Jun 27, 2016
    Replies:
    10
    Views:
    7,379
    Ian Brown
    Aug 21, 2017
  15. kschung

    propulsion of kort nozzle

    kschung, Aug 10, 2004
    Replies:
    11
    Views:
    12,351
    Barry
    Aug 13, 2017
  16. Leveboat

    reverberation on pontoon?

    Leveboat, Apr 23, 2017 ... 2
    Replies:
    16
    Views:
    4,347
    ondarvr
    Apr 25, 2017
  17. ATMHC

    "Duo-Prop" Inboard Transmission ????

    ATMHC, Jun 26, 2007
    Replies:
    8
    Views:
    6,684
    brian eiland
    Apr 23, 2017
  18. Angle X

    GM 3.6 motor in boat?

    Angle X, Apr 23, 2017
    Replies:
    0
    Views:
    3,380
    Angle X
    Apr 23, 2017
  19. valvebounce

    jack plates and steering connection.

    valvebounce, Apr 17, 2017
    Replies:
    2
    Views:
    2,791
    valvebounce
    Apr 18, 2017
  20. Squidly-Diddly

    homebrew and bottling of hydrogen gas with scuba compressor?

    Squidly-Diddly, Apr 9, 2017
    Replies:
    7
    Views:
    3,380
    Stumble
    Apr 10, 2017
  21. mitchellleary

    Advice on the correct power rating for my Autonomous boat

    mitchellleary, Mar 30, 2017 ... 2
    Replies:
    20
    Views:
    5,206
    daiquiri
    Apr 7, 2017
  22. Liopleurodon

    Jet drive, tunnel, or tunnel outboard for low HP low draft

    Liopleurodon, Mar 16, 2017
    Replies:
    7
    Views:
    6,280
    Liopleurodon
    Mar 23, 2017
  23. DCockey

    Short Shaft / Surface Drive / Mud Motors

    DCockey, Mar 20, 2017
    Replies:
    1
    Views:
    5,449
    tom kane
    Mar 20, 2017
  24. 1J1

    Magnus effect for ship propulsion

    1J1, Mar 6, 2017 ... 2 3
    Replies:
    36
    Views:
    13,595
    Ilan Voyager
    Mar 14, 2017
  25. Random_user

    Used hydra-drive

    Random_user, Mar 6, 2017
    Replies:
    2
    Views:
    3,070
    Random_user
    Mar 6, 2017
  26. brian eiland

    U-joint, CV-joint, Thompson coupling

    brian eiland, Mar 16, 2007 ... 2 3
    Replies:
    37
    Views:
    27,360
    Angle X
    Mar 4, 2017
  27. bcobbett

    1995 Seadoo HX - Stalls at high speed

    bcobbett, Dec 10, 2016
    Replies:
    3
    Views:
    2,932
    Random_user
    Mar 3, 2017
  28. Timetogo

    Putting this out there for discussion (livaboard river boat propulsion)

    Timetogo, Feb 27, 2017
    Replies:
    2
    Views:
    3,780
    sailhand
    Feb 28, 2017
  29. dwicejama

    voith scheider construction

    dwicejama, Feb 22, 2017
    Replies:
    0
    Views:
    2,940
    dwicejama
    Feb 22, 2017
  30. bluedolfin

    Repower 34' yacht with diesel AC gen-set & VFD

    bluedolfin, Feb 15, 2017
    Replies:
    9
    Views:
    4,192
    Stumble
    Feb 16, 2017
  31. JasonCatt

    Interesting digital magazines on all things electric....

    JasonCatt, Feb 4, 2017
    Replies:
    1
    Views:
    2,493
    Ike
    Feb 5, 2017
  32. Angle X

    Rim drive propeller? Shaft driven rim drive?

    Angle X, Dec 31, 2016
    Replies:
    0
    Views:
    3,589
    Angle X
    Dec 31, 2016
  33. mtht110

    Propeller dia and shaft rpm

    mtht110, Dec 17, 2016
    Replies:
    4
    Views:
    4,021
    Trojan
    Dec 22, 2016
  34. voodoo92

    Used and abused question. Stern drive vs ob

    voodoo92, Jul 7, 2014
    Replies:
    3
    Views:
    4,011
    mydauphin
    Nov 20, 2016
  35. sdowney717

    Vernatone muffler inline, one louder than the other

    sdowney717, Sep 26, 2016
    Replies:
    2
    Views:
    2,586
    kapnD
    Nov 17, 2016
  36. Danob

    prop shaft packing nut dripping to much

    Danob, Sep 18, 2016
    Replies:
    7
    Views:
    6,469
    kapnD
    Oct 17, 2016
  37. MoeZ

    Question about the jackshaft+sterndrive configuration

    MoeZ, Sep 26, 2016
    Replies:
    3
    Views:
    3,683
    MoeZ
    Sep 26, 2016
  38. ahdblo7

    OMC Shift cable or gear issue??

    ahdblo7, Sep 10, 2016
    Replies:
    2
    Views:
    3,567
    PAR
    Sep 10, 2016
  39. engnr09

    compressed natural gas engine

    engnr09, Jan 16, 2011 ... 2
    Replies:
    15
    Views:
    13,671
    FAST FRED
    Aug 17, 2016
  40. siewertdesign

    Python Drive bushings

    siewertdesign, Aug 1, 2016
    Replies:
    4
    Views:
    3,034
    siewertdesign
    Aug 3, 2016
Showing threads 81 to 120 of 985

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