Which Engine

David · 02 July 2000, 18:35

I am thinking of buying an Avon 6.2m.
Which engine is more suitable a Honda 130 four stroke or a Yamaha F115AETL.

John Kennett · 03 July 2000, 06:16

David

The Honda 130 is substantially heavier than the Yamaha 115, but has the advantages of quiet, smooth running and fuel economy.

My guess is that the boat would be better balanced, and a better drive with the Yamaha 115.

You may decide that the advantages of the 4-stroke outweigh the drawbacks though.

I don't have the figures to hand, but it would be a good idea to find out how much each engine actaully weighs to you can see how much difference it would make.

John

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John Kennett
RIBnet

Alan · 03 July 2000, 11:03

I think both engines are 4 stokes are they not? You should check out the comparitive weights. Other options could be the new 135 OMC Ficht?

David · 03 July 2000, 16:46

Yes both engines are four stroke. I will check the specs. What is the 135 OMC?
Is there a formula to working out the best
weight to power ratio v performance?

John Kennett · 04 July 2000, 07:08

Quote:

both engines are four stroke

That's me completely missing the point then! Should have read the question more carefully . . .

Don't know much about the Yamaha 4 strokes, but with Yamaha's reputation they're likely to be good.

Sorry not to be able to help.

John

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John Kennett
RIBnet

Alan · 04 July 2000, 14:10

The 135 OMC is the latest "Ficht Ram" fuel injected 2 stroke from Evinrude. No idea as to its exact specs, was going to suggest that you check out www.omc-online.com but their website appears not to have any info on this engine. I know its been released - saw it at RIBEX!

Presumably your Avon Dealer, if he is worth his salt, can advise you on the best set up? I seem to recall that RIB International Mag tested a 6.2m with a Honda 130. Might be worth getting in touch with them (www.ribmagazine.com)

HTH,
Alan

David · 04 July 2000, 20:19

Thanks for your help on this topic I will get in touch with RIB mag.

Menno · 05 July 2000, 22:17

is the omc 135fight based on a v4 or v6 engine ??
i have expierience with the 115 hp v4 fight
its not as fast as a carburated engine

Alan · 16 August 2000, 00:33

David,

If its not too late can I recommend that you DONT go for the Honda 130. Its a fine engine but too heavy for the Avon 6.2m. I speak from experience....I helmed a 6.2 adventure from the Scilly's to Falmouth on Sunday in a Force 5! The hull is great, performs well in poor conditions and gives a reasonable ride. (In a 10ft sea any 6m RIB is going to be less comfortable than a larger RIB!). However the engine is extremely heavy for the size of boat which made the whole rig very tail heavy. Consequence is that you tend to fall stern first down waves which is uncomfortable to say the least!

It was also apparent that performance in all conditions is not exactly inspiring. I think the max speed we saw was 33kts or so. The chap who owns this RIB says that he doesn't like to go faster than 28kts as it becomes skittish, although I think that might just be down to trim and confidence.

It very much struck me that a lighter 4 stroke (say Honda 90, Yam 100) would give very similar performance and a much better and safer ride. Or, if you want the high end peformance, go for a 2 stroke such as a 115 or 135ficht as previously discussed.

HTH, I still am slightly bruised and battered from my trip so this is fresh experience for you!

Alan

weaves · 14 September 2000, 14:16

If you are going to go for a 2stroke, you may want to consider a Yamaha HPDI. Just my personal preference for reliability/fuel savings.