Conversion from Marine V-8 to 4 cyl diesel.

Discussion in 'Propulsion' started by CAPT. Ted, Oct 11, 2020.

  1. CAPT. Ted
    Joined: Oct 2020
    Posts: 1
    Likes: 0, Points: 1
    Location: Hollywood, MD

    CAPT. Ted New Member

    I have a nice 1988 20’ Shamrock Walk-through with the original Ford Pleasurecraft Marine 302 V-8, with a Velvet Drive AS-71C transmission. The boat has hard chines and a keel, but it is NOT a deep Vee hull. I am considering (Actually, I may have no choice) a repower; and am looking at a Volvo D2-60 or a D2-75. This engine swap would save me over 450 lbs, and I would gladly give up the 30+ mph top speed for a much quieter ride, and a top end in the upper mid teens. Back in the late 1940s and early to mid 1950s, 60-80 hp in-line 4 cylinder and 6 cylinder engines were commonplace for 16’ -20’ boats of about my same displacement (2,500 lbs after re-power). At one time, there were some on-line calculators about engine hp, torque, displacement, and prop size. By way of comparison, a NEW Matthews ‘22 Bay Cruiser with a Yanmar 100 hp 4 cyl with a hull configuration similar to mine, makes 22 knots. I don’t see a down side to doing this, but I’m curious if anyone else has done a similar swap.
     
  2. bajansailor
    Joined: Oct 2007
    Posts: 1,619
    Likes: 483, Points: 83, Legacy Rep: 37
    Location: Barbados

    bajansailor Marine Surveyor

    Welcome to the Forum Capt Ted.

    I know a chap here who has a 1996 centre console Shamrock 20 - when he first got her about 10 years ago she had a GM V-8 275 hp petrol engine, and 2 years later he refitted her with a turbocharged 4 cylinder diesel Yanmar 4JH producing 110 hp, and he has been very happy with her ever since.
    He had to buy a new propeller, but I think that was about it - I think they still have the same shaft and stern tube.
    Edit - and I think he had to do some modifications to the beds, but not a lot.
     
    Last edited: Oct 11, 2020
  3. brendan gardam
    Joined: Feb 2020
    Posts: 367
    Likes: 41, Points: 28
    Location: east gippsland australia

    brendan gardam Senior Member

    I would like to marinise a hyundai r model 2.0 diesel from 2011 onwards hyundai and kia suvs. Lovely little diesel that put out around 180 hp.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.