Propulsion

Discuss marine engines, drives, and propulsion systems.

  1. Props

    Propeller selection, performance comparison, prediction, experience, and modification.
    Discussions:
    542
    Messages:
    6,432
    Latest: Availability of 6 spline props BlueBell, Dec 30, 2024
    RSS

  2. Surface Drives

    Surface Drives. Arneson, BPM, Seafury, PSI, Levi, Etc.
    Discussions:
    186
    Messages:
    2,863
    Latest: Inboard surface drive small boat. Master spearfisher, Sep 8, 2024
    RSS

  3. Jet Drives

    Jet Drives (pumps, impellers, etc.)
    Discussions:
    461
    Messages:
    4,436
    Latest: Vospower water jets Ovrthhills, Aug 20, 2024
    RSS

  4. Outboards

    2-stroke and 4-stroke outboard motors.
    Discussions:
    1,040
    Messages:
    10,006
    Latest: 6 spline prop availability pistnbroke, Dec 23, 2024
    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:
    538
    Messages:
    4,991
    Latest: Magnetic couplings portacruise, Oct 25, 2024
    RSS

  8. Diesel Engines

    Diesel Engines
    Discussions:
    689
    Messages:
    8,587
    Latest: Mild overhaul and then repower, Cat 3208 to ? gonzo, Jan 9, 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:
    2,095
    Latest: More problems with wet lithium ion batteries - Port of Miami fire philSweet, Jan 19, 2025 at 8:39 PM
    RSS

  11. Hybrid

    Hybrid propulsion such as diesel electric, hydraulic.
    Discussions:
    211
    Messages:
    5,257
    Latest: Trolling Motor(s) for Primary Propulsion of 15' AL 'skiff' cahudson42, May 31, 2024
    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. Sea Monkey

    Hydraulic start

    Sea Monkey, Oct 15, 2024
    Replies:
    4
    Views:
    1,172
    gonzo
    Oct 16, 2024
  2. wroc

    Kick-up propeller shaft for shallow draft

    wroc, Oct 8, 2024 ... 2
    Replies:
    18
    Views:
    991
    gonzo
    Oct 9, 2024
  3. Jason Rodgers

    Unequal size exhaust hose and thru hull connection

    Jason Rodgers, Sep 9, 2024
    Replies:
    6
    Views:
    887
    seasquirt
    Sep 10, 2024
  4. DaveAtAmazingGrace

    Aquadrive CV Joint Spraying Grease

    DaveAtAmazingGrace, Aug 9, 2024
    Replies:
    9
    Views:
    1,034
    DogCavalry
    Aug 13, 2024
  5. Mark Klep

    Deciding on the best axle for my sailingboat

    Mark Klep, Jul 18, 2024
    Replies:
    1
    Views:
    727
    gonzo
    Jul 19, 2024
  6. cmb1998

    Propulsion for a 36ft aluminum boat

    cmb1998, Apr 12, 2024
    Replies:
    11
    Views:
    1,318
    BlueBell
    Apr 14, 2024
  7. scav000

    Can you run the main engine submerged while still on the dry dock?

    scav000, Apr 9, 2024
    Replies:
    3
    Views:
    1,989
    fallguy
    Apr 19, 2024
  8. David Swingler

    Outdrive to Inboard conversion

    David Swingler, Mar 22, 2024
    Replies:
    9
    Views:
    1,560
    fallguy
    Mar 22, 2024
  9. DCockey

    Yamaha acquires Torqeedo

    DCockey, Jan 19, 2024
    Replies:
    5
    Views:
    2,188
    Paul Scott
    Jan 24, 2024
  10. paticus

    Gear ratio for houseboat

    paticus, Oct 27, 2023
    Replies:
    13
    Views:
    2,590
    gonzo
    Oct 30, 2023
  11. paticus

    Re-powering a houseboat - Stay with Stern drive?

    paticus, Oct 10, 2023 ... 2
    Replies:
    17
    Views:
    2,618
    paticus
    Oct 27, 2023
  12. MarkOHara

    Versilcraft / C.L.M. Studio Tecnico Navale, where are they now?

    MarkOHara, Jul 4, 2023
    Replies:
    5
    Views:
    1,750
    Rumars
    Jul 5, 2023
  13. naserrishehri

    Power efficiency

    naserrishehri, Jun 7, 2023 ... 2
    Replies:
    16
    Views:
    3,613
    TANSL
    Jun 11, 2023
  14. valter.f

    Twin stern tube propeller with only one engine

    valter.f, May 24, 2023 ... 2
    Replies:
    15
    Views:
    3,246
    valter.f
    Jun 1, 2023
  15. Forecaddie

    Outboard sail drive

    Forecaddie, May 11, 2023
    Replies:
    8
    Views:
    1,359
    Forecaddie
    May 14, 2023
  16. Flat bottom girl

    Large hp outboard on a tri

    Flat bottom girl, Mar 12, 2023
    Replies:
    2
    Views:
    1,752
    Paul Scott
    May 14, 2023
  17. rivergybsy

    Air boat for flood emergency

    rivergybsy, Jan 28, 2023
    Replies:
    3
    Views:
    1,661
    portacruise
    Jan 30, 2023
  18. Andy58

    RPM to Speed

    Andy58, Oct 16, 2022
    Replies:
    9
    Views:
    1,910
    Andy58
    Oct 18, 2022
  19. TheyCallMeTrinity

    15 foot Aluminum Boat with Z482 Kubota

    TheyCallMeTrinity, Oct 12, 2022 ... 2
    Replies:
    28
    Views:
    5,823
    TheyCallMeTrinity
    Jan 2, 2023
  20. telak

    Evinrude E-tec 300hp v6 what/how to check?

    telak, Jun 29, 2022 ... 2
    Replies:
    17
    Views:
    3,885
    telak
    Aug 9, 2022
  21. emrecantasdemir

    Dual - Fuel marine engines

    emrecantasdemir, Jun 3, 2022
    Replies:
    6
    Views:
    1,587
    baeckmo
    Jun 4, 2022
  22. DogCavalry

    Power to Weight Ratio

    DogCavalry, Apr 16, 2022
    Replies:
    9
    Views:
    2,033
    jehardiman
    Apr 17, 2022
  23. Ruffner Sedurifa

    Propeller Puller

    Ruffner Sedurifa, Mar 29, 2022
    Replies:
    10
    Views:
    2,042
    Ruffner Sedurifa
    Apr 3, 2022
  24. Kirk

    How to make a pedal powered prop.

    Kirk, Feb 24, 2022 ... 2
    Replies:
    15
    Views:
    10,100
    Kirk
    Feb 28, 2022
  25. DCockey

    Mercury 175 HP Outboard Diesel Fuel Spark Ignition

    DCockey, Feb 2, 2022
    Replies:
    4
    Views:
    2,766
    DogCavalry
    Feb 4, 2022
  26. BigMuddy

    Sternwheeler Power Requirements

    BigMuddy, Jan 17, 2022 ... 2
    Replies:
    22
    Views:
    6,071
    Spokart
    Apr 20, 2023
  27. LePrince

    Tug Bullard Pull Calculations

    LePrince, Oct 24, 2021
    Replies:
    6
    Views:
    2,116
    LePrince
    Oct 29, 2021
  28. alby joy

    Engine not reaching Rated RPM during gearbox engaged

    alby joy, Sep 2, 2021
    Replies:
    11
    Views:
    3,687
    comfisherman
    Nov 9, 2021
  29. Rasmith

    Bio Inspired Propulsion

    Rasmith, Aug 28, 2021
    Replies:
    7
    Views:
    2,926
    Rasmith
    Sep 30, 2021
  30. HeyK20

    How are Thai Long Tail Boats Cooled?

    HeyK20, Jun 22, 2021
    Replies:
    3
    Views:
    2,678
    gonzo
    Aug 27, 2021
  31. boat3630

    Test borg warner transmissions

    boat3630, Dec 31, 2020
    Replies:
    9
    Views:
    3,193
    gonzo
    Jan 3, 2021
  32. marufuddin0

    3D Propeller Design

    marufuddin0, Dec 13, 2020
    Replies:
    7
    Views:
    4,015
    Heimfried
    Dec 21, 2020
  33. CAPT. Ted

    Conversion from Marine V-8 to 4 cyl diesel.

    CAPT. Ted, Oct 11, 2020
    Replies:
    2
    Views:
    3,468
    brendan gardam
    Oct 12, 2020
  34. AAn

    Wave force induced power proa magnetic propulsion

    AAn, Sep 3, 2020
    Replies:
    7
    Views:
    3,022
    Will Gilmore
    Sep 4, 2020
  35. hlblake

    1994 Crusader Xli

    hlblake, Aug 20, 2020 ... 2
    Replies:
    24
    Views:
    3,667
    brendan gardam
    Aug 25, 2020
  36. Manateeman

    Turbo coating with ceramics

    Manateeman, Aug 13, 2020
    Replies:
    4
    Views:
    1,878
    KeithO
    Aug 17, 2020
  37. Bradleylarkin

    Best Propulsion system for my boat

    Bradleylarkin, Jul 29, 2020
    Replies:
    7
    Views:
    2,213
    kapnD
    Aug 2, 2020
  38. YSS Caribbean

    Daily fuel consumption calculation

    YSS Caribbean, Jun 29, 2020
    Replies:
    7
    Views:
    2,377
    YSS Caribbean
    Jun 30, 2020
  39. aybabtme

    Fuel system plumbing (diesel)

    aybabtme, May 30, 2020
    Replies:
    4
    Views:
    2,179
    Jeremey Stadnik
    Dec 8, 2020
  40. Andre Raath

    marinized 240D running hot

    Andre Raath, May 9, 2020 ... 2
    Replies:
    20
    Views:
    4,256
    sdowney717
    Jul 20, 2020
Showing threads 1 to 40 of 982

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