Thread: Johnson "70mod"

  1. #271
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    just watched todays vids.
    that boat is running very very good, sounds very good too, nice crisp 2 stroke sound.

    Soon be needing to find something to race against, hunt for a V6 on a 19ft .

  2. #272
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    can you show us a bit more about the prop you use and how you modified it from being a normal prop.
    this seems to be giving you some very good results.

  3. #273
    Team Member hupiveneilija's Avatar
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    Here.
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  4. #274
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    that looks very good.

    been alter in lots of ways, nothing like an srx now.

    what is wrong with the hub ? it is not all the way in , should be level with hub face !!!! is there a reason for this ?
    Did you have a new hub put in this prop ? was it a v6 prop re-hubbed. ?

  5. #275
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    anymore updates on how the engine is now ?
    is everything still good ?

  6. #276
    Team Member hupiveneilija's Avatar
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    Havent tried bigger carbs yet. Been playing with prop, back&forth. Made those waterholes on the block,wich i enlarged before, smaller today. Going to run it tomorrow to see of i can make temperature behave like i want.
    Waters getting warmer now, affect speeds by decreasing it.

    Btw went 85km and 30l gas. Not much i think.

  7. #277
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    85 kilometres distance = 52 miles.
    30 litres of fuel = 6.6 gallons. depends on how long it took to get there ? if it took 1 hour then thats about right.

    it works out roughly every 10hp - 1 gallon per hour, so 60hp = 6 gallons per hour, 100hp =10 gallons per hour.

    so your doing fine on the fuel side.

  8. #278
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    We old geezers grew up with that mpg estimating technique, and it's still good today.

    Jeff
    "We live at the bottom of an ocean of air." - General Marvage Slatington

  9. #279
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    your dead right there Jeff
    and it is not far out when seeing the so called fuel frugal E-tecs at full throttle too.

    with the mods done on this motor the fuel consumption as still stayed around the same, this being due to letting the motor breath a bit better and not going to mad
    on the modifications. great all round modifications and some pretty extreme results with speed. !!!

    will see how it goes when the bigger carbs go on , should be miles better at pull away and mid range, with just a small amount on top end.
    that is what I found when going up to the big carbs.

  10. #280
    Team Member hupiveneilija's Avatar
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    Update:
    Cooling is now solved. Made dumpvalve for incoming water, changing spring can adjust max pressure. I dont have that thermoelement in place in that plastic surrounding yet so idle temp is ~40*c and it rises to 60*c on wot. Can make it higher or lower now and it stays steady.

    Also changed mainjets from 56to52 and middle jet from 32to36, goes better downlow and little snappier on top.

    One very irritating feature is when make fullthrottle start and trim is all the way neg, bow goes so high that fluid level on bowls goes here'n'there and it stalls couple times before goes. But there is attleast one solution for that, nice and smooth takeoff!
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