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Old 16 November 2006, 10:10   #1
Country: UK - Scotland
Town: Huntly
Make: Searider 4.7
Length: 4m +
Engine: 75 Suzuki
Join Date: Oct 2004
Posts: 186
Johnson or mariner

Which will be the most economical? Johnson 150hp, mariner 175hp both carb models.
The boat is 7m humber. or would it be better to go ott and put on a 200hp+ engine?

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Old 16 November 2006, 11:48   #2
MarkM's Avatar
Country: Netherlands
Town: Breda
Make: Scorpion
Length: 7m +
Engine: Evinrude 250 DI
Join Date: Oct 2003
Posts: 368
When you put a 150 on a 7m boat it will be a 200 or more within a year or so.

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Old 16 November 2006, 15:34   #3
Pete7's Avatar
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,837
If you want a view on the Johnson V6 have a search for Nashers various posts and then buy yourself an oil tanker. Had 2 150 Mariners, an early 2 litre 150 that did 40 LPH and the later 2.5L Magnum did 45 LPH on a Ribtec 6.45.

Ribnet is best viewed on a computer of some sort
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Old 16 November 2006, 16:59   #4
Nasher's Avatar
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,142
Mmmm... Pete, thanks for reminding me.

My old Johnson 150VRO had a big drinking problem.
At 25-30Knots on my 6.5M Ocean it could quite happly do 3l a mile.

I used to call it the petrolator.

They might appear to be cheap power, but a day out in the boat became very expensive, and my range was non existant.

It didn't help that it struggled to power the heavy ocean and was run at high throttle settings to give a decent cruising speed.

By comparison the Suzuki 200EFI I run now can cruise the Ocean along at 30Knots on much lower throttle settings on @1.25 - 1.5l a mile. And I've seen 52 knots recorded on the GPS.
Bearing in mind the engine is a 98 model, that cost me little more than 2k to buy used, and by fitting it myself was a very cheap, but fantastic transformation of the RIB.

RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
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