Outboards 2009 - HP, Weight, Make Comparison

Discussion in 'Outboards' started by rwatson, Sep 19, 2009.

  1. rwatson
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    rwatson Senior Member

    Just did a chart of motors between 20 and 150 hp, with weights, by make. Thought I would upload it in case anyone is interested.
     

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  2. ririzarry
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    ririzarry New Member

    Very helpful...

    Thanks,

    Rob
     
  3. Fanie
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    Fanie Fanie

    Interesting to note up to a 60hp the weight remains relative low, then it shoots up by quite a bit. The remaining factor to consider is the price...
     
  4. rwatson
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    rwatson Senior Member

    Wish I could get some prices - they seem to be "secret distributor business".

    Varies so much from country to country too
     
  5. Fanie
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    Fanie Fanie

  6. rwatson
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    rwatson Senior Member

    Motors HPxWeightxMake with Tohatsu

    I just put the Tohatsu specs on that chart.

    You are right, they have a very good weight/power ratio at least
     

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  7. Itchy&Scratchy
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    Itchy&Scratchy Senior Member

    I may be wrong here, but I think Tohatsu are made by Yamaha.
    J
     
  8. mwatts
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    mwatts Martin

    A little more detail could help... ;)

    No Yamaha's lower end brand is Selva. Tohatsu's are built by Nissan. I don't know if they are 1:1 the same though.

    @RWatson: Did you compare identical motors? Because long shaft / short shaft, tiller / no tiller, powertrim yes / no, dryweight or ready-to-run all make a difference in weight. Otherwise it's like comparing apples & pears.

    For instance, if I look up the 2009 specs for a Yamaha F20B, I see it weighs 51.7 Kgs, not 61, and an F30 83.8 Kgs, not 99.

    Are the Tohatsu's in the chart the 4-strokes or the 2-stroke Direct Injected (TLDI) engines?
     
  9. rwatson
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    rwatson Senior Member

    All the 20 hp are the same weight with prop, and they *are* 61 kg There are four F20B models, and they all weigh the same,. Weight is quoted as Weight (kg) with prop. 51.7 ~ 60.7 , which I take means around 51-61 kg, so I pick the highest

    http://www.yamaha-motor.com.au/marine/index.htm?marine.asp

    Yamaha 20 HP (4 Stroke)
    Model Weight with prop (kg) Transom Height MM
    F20BEPL 60.7 508
    F20BEHPL 60.7 508
    F20BMHS 60.7 381
    F20BMHL 60.7 508

    There are 4 F30's quoted (not one) and the weights are not 83.8 kilos
    http://www.yamaha-motor.com.au/marine/index.htm?marine.asp

    F30BEHTL 104 536
    F30BEHTL 104 536
    F30AEHTL 95 533
    F30AETL 90.4 533

    so the average weight is 98.35 (99)

    There is no quoted dryweight V "ready to run" figures I can see, unless you add the Oil Pan Capacity (2 litres) which is just nit picking. Tiller arms are not significant.

    You have to assume powertrim is within the maximum weight for the small engines, and standard on all engines over a certain size ( maybe thats why the jump in weights over 30, and weight range for the low enders)

    All updated figures with web site addresses and features are welcome though. I am happy to check all figures in the chart as it makes it more usefull to everyone
     
  10. tom28571
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    tom28571 Senior Member

    The main thing you point out with these charts is that it is wise to look at the actual specs of motors rather than listen to general beliefs on the weights and power of outboards. Some 4 strokes are heavier than 2 strokes of the same "rated" power by only a couple percent.

    What the actual developed HP of these engines is, is not often known so accuracy of comparisons suffer.

    Mid power range Suzuki 4 strokes are much heavier than their counterparts from other manufacturers. They are also much higher displacement than their counterparts so do we trust the power ratings? A Suzuki 60 is over 45% heavier and 25% greater piston displacement than other similar engines. This does not look reasonable. Apparently the Suzuki is highly detuned and derated. Where weight is not a factor, the Suzuki 60 looks like a rugged engine.
     
  11. rwatson
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    rwatson Senior Member

    Hmm, can we not trust the facts quoted by manufacturers ? They get validated by lots of different people. I wouldnt have thought they would fib much.

    yes - whats the point you want to make ?

    I really am not sure what you mean by this. Could you explain more please ?

    No - its only the 60 that is "much heavier"
    The Suzuki 60 is 1298cm Displacement, and weighs 160 kilos, way over comparable motors. I cant think of when weight isnt a factor, but I would be interested in how the weight makes it more rugged. I have no experience with that engine.

    The reverse is true for the larger powered motors

    for example

    Suzuki
    DF 90A/80A/70A 4 Stroke
    Multi point Sequential Electronic Fuel Injection
    Maximum Output: 90hp (66.2kW) / 80hp (58.8kW) / 70hp (51.5kW)
    Cylinders: In-line 4
    Displacement: 1502cm3 (91.6 cu. in.)
    Weight kg: L: 160
    X: 164

    Yamaha
    NEW F80BETL (4 Stroke)
    Engine Type 16-Valve Direct Action Inline 4 Cylinder
    Displacement cm³ 1595
    Bore x Stroke (mm) 79 x 81.4
    Output (hp) 80
    WeWeight (kg) with prop. 172 ~ 181

    Here the Yamaha has a bigger displacement than the Suzuki, and weighs more. It looks like the Suzuki 60 is just a detuned 90/80/70 . is this better or worse ?

    All thoughts appreciated.
     
  12. mwatts
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    mwatts Martin

    No, it doesn't mean they all weigh same. It means Yamaha has been a bit lazy, and the short-shaft manual-start 20HP weighs 51.7 Kgs, and the long-shaft electric-start with tiller 20HP weighs 60.7 Kgs. Quite a big difference for motors this size.

    Yes, you're right about that. ;)

    Look at these two engine's:

    Model Weight
    F30AEHTL 95
    F30AETL 90.4

    The difference (the 'H') is the tiller handle. It apparently weighs 4.6 Kgs. I think that's significant.

    You're doing a good job. ;)
     
  13. Fanie
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    Fanie Fanie

    Seems the 'H' stands for handle. There's probably a steering in that tiller for that weight ;)
     
  14. rwatson
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    rwatson Senior Member

    4.6 kilos significant ?????

    Come ooooooon!.

    You will be carting more beer than that - just put it in the cooler up in the bow!!! :eek:
     

  15. Wynand N
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    Wynand N Retired Steelboatbuilder

    .

    Wrong on both counts;) Perhaps as a Tohatsu dealer I can shed some light on these magnificent motors...

    Tohatsu is build by Tohatsu who incidentally is the biggest and oldest outboard engine manufacturer in Japan. In some markets the Tohatsu is marketed as a Nissan and this may come as a shocker to those believing in the American dream. All Mercury's two stroke engines from 50hp down to 2.5 are built by Tohatsu and are just badge engineering. Mercury's four stroke are build by Tohatsu.

    I will be more than happy to supply spec/data on the engines when asked since I have everything at hand as a dealer.

    As a sidenote; due to the high engine power/weight ratio and reliability of Tohatsu, they are the engines of choice in the ZapCat and Thundercat international surf racing classes...
     
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