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Old 16 September 2003, 08:04   #11
Country: UK - Isle of Man
Town: Douglas Isle of Man
Make: Osprey
Length: 5m +
Engine: Suzuki 70hp 4 stroke
MMSI: 235035776
Join Date: Dec 2002
Posts: 288
What's all this about accountants?

I'm an accountant.

I have a 2 stroke 70hp Johnson - noisy, thirsty but goes like a train, hates idling.

I have a 4 stroke 70hp Suzuki - can't hear it, great fuel consumption, idles all day.

If you want to roar around pulling skiers etc., and have deep pockets, get the two stroke

If you like peace & quiet, bit of fishing perhaps, or are tootling around doing safety boat or harbour work - get a 4 stroke.

And stop slagging accountants...we have feelings too you know!

Tax is paid by mortals
whitingiom is offline   Reply With Quote
Old 16 September 2003, 17:41   #12
Country: UK - England
Make: Ribcraft 6.5
Length: 6m +
Engine: Suzuki DF175TG
Join Date: Apr 2002
Posts: 929

I read your post with interest. You seem to have had a completely different experience to me. I upgraded my engine from a 60hp Mercury 2/ to a 60hp Mercury 4/ EFI. After my experience I would never buy a 2/ again. Top speed has increased significantly, better acceleration, fuel consumption is much, much better (I'm not an accountant, just an adventurer who likes to go further).

I think there is some confusion. 4-strokes will produce more torque at low revs than a 2-stroke and therefore 4/s are much better for water sports. For this reason top speed should be less affected by weight also. In fact you will find that RIB designs are changing to accommodate 4 strokes as the transoms have to deal with much greater forces. A common mistake is that these extra forces are due to the extra weight of the engine, which is not the case.

As Keith points out, for applications where the engine needs to be carried or isnít stored on the boat then a 2 stroke will be a much better choice. Similarly I think the 2 strokes still lead at the other end of the range (>150HP). However for mid range applications (40HP -> 115HP) then 4/s are the way to go.

- more importantly get the right prop! makes all the difference

DJL is offline   Reply With Quote

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