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Old 21 July 2006, 16:10   #1
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Best engine size?

I am currently doing some research around buying my first Rib, and have narrowed down to a few. Current preference is an Avon Searider 4m, with a jockey console and about 40hp engine. I want to use in the Solent, crossing to IOW and back, and probably pull some toys at some stage. I'm reasonably heavy (around 15.5stone) and would appreciate advice on an engine size that would suit?
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Old 21 July 2006, 16:31   #2
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Hi Cinman,

My friend has that setup with a 40 HP Yamaha 2 stroke on the back and its awesome. He doesn't weigh 15.5 stone though. I run a 50 HP Yam 4 stroke which pushes the boat along nicely. I weigh 13.5 stone and carry passengers at times.
I think 30 HP is to small. I've seen Seariders with 30s on the back and they are a bit lame.
A good 40 should do, not 4 stroke at that size tho. You probably need a 50 for 4 stroke.
In my honest opinion and I'll probably get flack for saying this. Steer clear of the Honda engines in this size.
Best of luck with your new purchase. You won't go far wrong with a Searider. I even got back from the IOW last week in Force 6/7. It just takes a little time and some patience to read the waves.

Regards Nick R.
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Old 21 July 2006, 17:59   #3
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I'm with Biggles on this.

I've got a 50hp 2-stroke on mine and it's wonderful-no trouble apart from being a tad uncomfortable 3 up (and I'm HEAVY!) in force 7 gusting 8 out in Poole Bay.I wouldn't have wanted the extra weight of a 4-stroke in those conditions with effectively 4 people on board.

It's considerably more expensive to run a 2 stroke though. If you don't plan on doing silly things in it then its not going to be a problem having the extra weight of a 4-stroke and your wallet will feel much better after filling up.
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Old 21 July 2006, 20:50   #4
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why steer clear of a honda 50 its the best and lightest 4 stroke in its class , a whole 7 kg heavier than a yam 50 2 stroke . The fact that you need to carry less fuel and no oil actually make the load considerably lighter unless you are only going out for an hour or so .
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Old 22 July 2006, 04:49   #5
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Ian,

Fair comment. I don't own a Honda but I've been out with a couple and they just don't seem to have the same power output as other engines. Maybe they were just set up wrong with the incorrect propellor etc.

What was good to see last week was my friends Searider with a newish mariner 50 HP 2 stroke, two adults on board and fifity litres of fuel doing 34 Knots back from Nab Tower. He lost me anyway. He managed to do that because he went to Pepes and sought advice on a new propellor. I really need a new propellor, but I'm selling the boat this winter, as I am only getting 5100 revs max on my 15 incher but that will give me 32 Knots on a good day. It sups petrol at that speed though.

Because I always go out with that Mariner I know that my fuel consumption is exactly half of his. That is a major factor to take in to consideration on any engine purchase I should imagine. Certainly something for Cinman2003 to consider.

If I can afford it on my next boat purchase over the winter I shall be getting a four stroke.

This is all information for Cinman to make an educated purchasing decision from.
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Old 22 July 2006, 06:22   #6
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2stroke 40-50hp outboards have been around for a long time and have not changed much, Proven relieability. 4strokes,good for recalles,thay still need some sortin time.
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Old 22 July 2006, 07:20   #7
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Quote:
Originally Posted by fast fred
2stroke 40-50hp outboards have been around for a long time and have not changed much, Proven relieability. 4strokes,good for recalles,thay still need some sortin time.
I constantly read comments like this and it doesn't make sense . Iam not geting into the 4/2 stroke debate here but you can't generalise about anything like that . One make of four stroke may be heavy and problematic and the other no problem at all .
You need to choose the best engine in a certain size , while honda make the lightest 50 they may make the heaviest 90 . It seems to depend on what HP they use that particular engine for ie the honda is probably a 40 or 50 in the same engine as is the 15/20 . I don't see the point in buying the lower power model .
Fuel consumption has for me to be the biggest factor and although I have limited knowlege I looked for the biggest engine I could find for the given boat size working on the theory that it wouldn't be working hard when cruising .
All I can say is the Valaint 490 and suzuki df 70 I ended up with seem very good on both fuel and power/weight ratio Iam getting about 1/2 litre to a mile .
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Old 22 July 2006, 07:38   #8
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Quote:
Originally Posted by ian parkes
I constantly read comments like this and it doesn't make sense . Iam not geting into the 4/2 stroke debate here but you can't generalise about anything like that . One make of four stroke may be heavy and problematic and the other no problem at all .
You need to choose the best engine in a certain size , while honda make the lightest 50 they may make the heaviest 90 . It seems to depend on what HP they use that particular engine for ie the honda is probably a 40 or 50 in the same engine as is the 15/20 . I don't see the point in buying the lower power model .
Fuel consumption has for me to be the biggest factor and although I have limited knowlege I looked for the biggest engine I could find for the given boat size working on the theory that it wouldn't be working hard when cruising .
All I can say is the Valaint 490 and suzuki df 70 I ended up with seem very good on both fuel and power/weight ratio Iam getting about 1/2 litre to a mile .
Yes, but us Cornish ribbers are all fit and lithe. The Solent guys appear to be mostly over 15stone Ian.
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Old 22 July 2006, 07:38   #9
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"I constantly read comments like this and it doesn't make sense "
just what dosesn't make sense? 4strokers don't work twice as hard to make the same power, which in turn thay ware an the same rate, or that thay have about twice the movein parts to fail in the powerhead.
simplicity is key.
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Old 22 July 2006, 07:50   #10
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Quote:
Originally Posted by fast fred
"I constantly read comments like this and it doesn't make sense "
just what dosesn't make sense? 4strokers don't work twice as hard to make the same power, which in turn thay ware an the same rate, or that thay have about twice the movein parts to fail in the powerhead.
simplicity is key.
If you're a Yank. I don't think that Messers Honda,Yamaha, Suzuki, et all would agree with that. I understand what you're saying, I just think that that view is a little out-dated. You must bear in mind that gas is $8 ish a gal here, so economy is a huge factor when engine choices are made. So the 4strokes failings are more than made up for in the improved economy.
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