50hp Evinrude Outboard

Discussion in 'Outboards' started by zamgod, Nov 16, 2012.

  1. zamgod
    Joined: Oct 2009
    Posts: 38
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    Location: Outer Hebrides, Scotland

    zamgod Junior Member

    Can anyone please tell me the age of my Evinrude?
    The only number visible on the engine is G3659167.
    It doesn't look like the proper Evinrude format, but there is nothing else to go by. Except that the colour of the cover is dark blue.
    Thanks.
     
  2. tunnels

    tunnels Previous Member

    Post some photos some one will be able to tell you what it is !!:p
     
  3. Frosty

    Frosty Previous Member

    The colour does not seem standard--it was made in 1967.

    Yes some photos would help Number of cylinders --
     
  4. zamgod
    Joined: Oct 2009
    Posts: 38
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    Location: Outer Hebrides, Scotland

    zamgod Junior Member

    The engine has two cylinders, it also has tilt/trim.

    Here's a couple of photos, I can get more if required. If it stops raining long enough ;o[
     

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  5. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    The serial number on my son's 1989 50 hp Johnson starts with G 229.... , so I guess you have a more recent model.
    There is a decal on top of the left bracket, stating type, serial number and country of assembly (USA). It may have been painted over.

    The Crowley Marine website has drawings and data of all Evinrudes produced since 1967, so determining what you have should not be that hard.
     
  6. tunnels

    tunnels Previous Member

    The 50 was a strong little motor and in the racing version sst45 they were draging more than 75 hp at 9000 rpms . :eek:
     
  7. Frosty

    Frosty Previous Member


    At the engine or the prop. You had a dynomometer?
     
  8. tunnels

    tunnels Previous Member

    Attached Files:

  9. tunnels

    tunnels Previous Member

    And a picture of the race boat!

    One of the boats we built would do over 80 mph and hardly slowed down going round corners , just a blip on the accelerator to drop the nose monentarily and you were round and on you way again
     

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  10. Frosty

    Frosty Previous Member

    Sorry but 75hp is a specific number. Ive never seen a Dyno on an outboard. If there had been something on those lines my mate would have had one.

    The biggest HP is normally settled in the race, the exact number is never known.

    A blip on the throttle does no lower the nose it is trimmed ,--it will not race without trim.

    Which is why the steering arms that you have posted in your picture have the pivot on the point of the trim hinge as the wire used is tight.

    The normal attachement would not --does not allow trim with a wire steering
     
  11. tunnels

    tunnels Previous Member

    When the power is on the nose is up when you take the power off the nose comes down and when a hull has rocker the back end goes up at the same time then you round the corner and power on full and nose comes up and tail goes down and away . Used to spend hours tinkering with all these things !! The bigger boat yes use trim push trim ram inside the boat and a fast pump with an auto cut out preset for trim up and trim down or you spend half you time pressing buttons .
    Dyno is coupled to the prop shaft just remove the prop and slip on the coupling and ear muffs turn on the water fire it up your are in business . A guy in Auckland had one trailer mounted and could come to your house if you wanted !!
    I cant find his sight but used to be advertised in the powerboat magazine
    It looked just like the one on this site
    http://www.land-and-sea.com/prop-shaft-dyno/marine-dyno.htm This is a more informative site
    http://www.internationaldyno.com/
     
  12. tunnels

    tunnels Previous Member

    Sorry but 75hp is a specific number. Ive never seen a Dyno on an outboard. If there had been something on those lines my mate would have had one. Out board dynos have been round for long time

    The biggest HP is normally settled in the race, the exact number is never known. if engine sizes are matched closer is driving skills and mechanical relybility that counts

    A blip on the throttle does no lower the nose it is trimmed ,--it will not race without trim.You are a little out of date i affraid

    Which is why the steering arms that you have posted in your picture have the pivot on the point of the trim hinge as the wire used is tight. these motors have trim rams but is inside the boat and pushes through the transom and bracket dirctly onto the main housing of the motor!

    The normal attachement would not --does not allow trim with a wire steering
     
  13. Frosty

    Frosty Previous Member

    If the engine is held up by the ram then the rams takes all the thrust. If you say the rams go through the transom then a hole must exist there and be bigger than the ram to allow for movement and there must be a some thing there to take that thrust to transmit through into the boat. The last question is WHY for twiddly 75HP?

    I have never seen or dreamed of such an animal but i've never been to NZ
     
  14. tunnels

    tunnels Previous Member

    I will go searching for you when i have time . the hole is only big enough for a push pod to go through thats all , the cylinder is a completely separate itam and mounted inside directly to the transom som guys on the smaller out boards use a handbrake from a car with the ratchet and a brake hydralic cylinder and a long wheel cylinder for with a push rod all home made but clever .
    The sst motor is for a class of boat sst 15, sst 45 ,sst 60 ,sst 120, dont know how high they go to . these are factory made race motors off the shelf !! have a look for racing out boards .
    http://www.apba.org/outboard-performance-craft
     

  15. zamgod
    Joined: Oct 2009
    Posts: 38
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Outer Hebrides, Scotland

    zamgod Junior Member

    I've managed at last to get some photos of the engine, hope this helps to determine age of engine.
    Thanks.
     

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