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Old 14 April 2004, 12:22   #21
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Jets?

Fair comment about the jets - as with engines back up is important!
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Old 14 April 2004, 14:31   #22
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Robbie twin 150s will be OK better than single I recon.
With the right props you will be getting 150 bhp performance under any load
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Old 14 April 2004, 15:09   #23
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hi robbie
great looking set up, i'd favour twin optimax 150 hp great lowend torque
easy to maintain my 7metre coded for ten reaches 30 knots with a bit of tweaking, how much is fuel petrol/deisel can you work out how many miles you will be doing as a round trip and then how much you will be charging per head for said trip then need to work out price per litre of petrol and deisel to see the two different profit margins then factor in the tits up scenario of engine going wrong on a deisel how much to fix and same again for the petrol.
the outboards will be cheaper to buy fix replace and that is a lot of petrol you can buy if going down this road some great threads on outdrives and legs going on at the moment hope this helps ,
regards
tim
www.griffmarineservices.co.uk
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Old 14 April 2004, 15:25   #24
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Tim,
It helps a lot and it's good to hear from someone more or less in the same business. I'll get a better idea on the math you suggested and get back to you with the data. I might be able to contribute for once!
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Old 14 April 2004, 16:02   #25
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Engine dilema - repair or replace?

Have a look at this thread. You could drop him a line and see what he decided on in the end.
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Old 15 April 2004, 21:41   #26
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Just wondering if anyone here has ever considered using 4 stroke outboards. The new honda bf150's seem like they'd be a good option if it weren't for the price. I just can't seem to find any head-to-head comparisons on the hondas vs. the Opti 150's... feul comparisons, low-end torque, the basics. Anyone here run the numbers?
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Old 16 April 2004, 06:07   #27
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The numbers is not important at this stage for the 4-strokes (in my opinion). These engines have not been proven yet since there is not much data about them and they haven't been around long enough. I think in the next 5 years we will see whether they are good or not.

On another note, not to forget that people use these engines in fresh water, or those who are using them in salt water do not leave their boats in the sea for months on end so there is not that much date regarding durability in the salt environment.

I really want to see and know if there is any data available on how a car engine (4-strokes marine engines are car engines) manages if is left say for 6-7 months in the sea at a time without being washed with fresh water at all during that time. Would it work??
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Old 16 April 2004, 06:13   #28
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I really want to see and know if there is any data available on how a car engine (4-strokes marine engines are car engines) manages if is left say for 6-7 months in the sea at a time without being washed with fresh water at all during that time. Would it work??
The suzuki 4 strokes arn't car engines.
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Old 16 April 2004, 06:19   #29
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Didn't know that. Thought all of those 4-strokes are car engines.
Do you know what's the difference with the Suzukis?
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Old 16 April 2004, 06:26   #30
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I know that the suzuki's were built as a marine outboard engine as opposed to all the others which are marinised car engines.
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