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Old 24 September 2013, 17:29   #1
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What Size Engine?

We have been out in our Honwave T35 and are very impressed with it. Four up (2 adults/2 kids) with all our kit and a 20hp 2 stroke on the back it goes really well.

However it has dawned on me, if we decide to do a bit of river cruising this engine is going to be too much. It will spend all its time just above tickover straining at the leash!

The question is, how small can we go on the engine before we have problems going against currents?

I have no experience in this area and would welcome any comments.


Many thanks,

Harvey.
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Old 24 September 2013, 17:35   #2
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Go for a 20hp four stroke?


It'll happily sit there all day on idle saying nowt and gently sipping away at your fuel.

I've got a Honwave with a Honda 20 on it, best of both worlds.
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Old 24 September 2013, 18:02   #3
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Go for a 20hp four stroke?


It'll happily sit there all day on idle saying nowt and gently sipping away at your fuel.

I've got a Honwave with a Honda 20 on it, best of both worlds.

Nooooooooooooooooooo. 4 strokes good, 2 strokes better

(On a lightweight sib )

The OP doesnt say if its an Autolube engine, but IMHO with Yamaha's it really doesnt matter. Either autolube or running 100:1 it will be fine, if its a really old one on 33:1 or 50:1 then run it a little lean when you are on the river.
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Old 25 September 2013, 01:31   #4
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Nooooooooooooooooooo. 4 strokes good, 2 strokes better

(On a lightweight sib )

The OP doesnt say if its an Autolube engine, but IMHO with Yamaha's it really doesnt matter. Either autolube or running 100:1 it will be fine, if its a really old one on 33:1 or 50:1 then run it a little lean when you are on the river.
sorry in this case I disagree., He has a great package and as A1an has said it will sip fuel and the OP knows the engine and that its reliable.

so why would the OP want to spend more money on a 2nd engine that he does not know, have another service cost, storage, etc. also the op is not looking for speed or acceleration and is just looking to potter around which again is another + for his current set up.

Dave
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Old 25 September 2013, 09:19   #5
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Interesting question. If costs and storage were not a problem to the OP, what would people's advice be. 5hp four stroke, any higher or lower suggestions?
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Old 25 September 2013, 12:02   #6
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Interesting question. If costs and storage were not a problem to the OP, what would people's advice be. 5hp four stroke, any higher or lower suggestions?
I realise everyone has different ideas, but personally I would not dream of going to sea without a back up engine. My main engine is very reliable..but things like starter cords can snap or the prop can hit submerged objects rendering the outboard engine unusable.

This SIB is 4.3 meters long and the 3.3Hp 2 stroke will happy push it along at displacement speeds of around 4 or 5 knots.

I dont know what strength of currents that happyharry is referring to in the river..but if they are strong currents..then I would use the 20 HP in those and switch to a small back up engine when happily plodding along in the deeper quieter parts of the river. Its far easier on the ears too.

A small second hand auxilliary engine can be picked up quite cheaply and certainly gives me piece of mind having two on the boat. I consider myself lucky as I have two x 2strokes on the back of this SIB and they probably have a combined weight of less that one modern four stroke main engine.


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Old 25 September 2013, 12:05   #7
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I realise everyone has different ideas, but personally I would not dream of going to sea without a back up engine. My main engine is very reliable..but things like starter cords can snap or the prop can hit submerged objects rendering the outboard engine unusable.

This SIB is 4.3 meters long and the 3.3Hp 2 stroke will happy push it along at displacement speeds of around 4 or 5 knots.

I dont know what strength of currents that happyharry is referring to in the river..but if they are strong currents..then I would use the 20 HP in those and switch to a small back up engine when happily plodding along in the deeper quieter parts of the river. Its far easier on the ears too.

A small second hand auxilliary engine can be picked up quite cheaply and certainly gives me piece of mind having two on the boat. I consider myself lucky as I have two x 2strokes on the back of this SIB and they probably have a combined weight of less that one modern four stroke main engine.


I disagree. a 4hp 4 stroke is much louder at idle than a 20hp 4 stroke...as soon as you hit 2 cylinders the noise reduces lots.
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Old 25 September 2013, 12:15   #8
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I guess I need to get my hearing checked then Henry.. the 3.3 is a single cylinder and the 25 is two cylinders and its certainly easier on my ears..perhaps I have a hole in the exhaust of the 25 HP ?

My tohatsu 4hp four stroke also seems noiser to my ears that the wee 3.3 two stroke..but I dont rev the guts out of them
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Old 25 September 2013, 12:22   #9
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I guess I need to get my hearing checked then Henry.. the 3.3 is a single cylinder and the 25 is two cylinders and its certainly easier on my ears..perhaps I have a hole in the exhaust of the 25 HP ?

My tohatsu 4hp four stroke also seems noiser to my ears that the wee 3.3 two stroke..but I dont rev the guts out of them
I don't know if it different with 4 strokes but the the smaller 4 strokes tend to be quite noisy




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Old 25 September 2013, 12:23   #10
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Oh damn, just realized that the OP has a 2 and not a 4 stroke, my bad!!
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