Reply
 
Thread Tools Search this Thread
 
Old 05 September 2005, 07:12   #1
Member
 
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: 4,147
Update on Engine Swap

Some of you know that I spent a good part of the beginning of this year converting my Ocean 6.25 to take the Suzuki 200HP EFI Iíd picked up cheap to replace my old Johnson 150VRO.

Now Iíve used it a few times I thought Iíd pass on some findings.

The Ocean is a heavily built boat in my opinion, and has a good sea-going hull rather than an out and out sports hull, just what I wanted when I picked it up in a sorry state 2 years ago. The Johnson 150VRO fitted was always going to be changed.

The VRO used loads of fuel, @2 to 2.5l per NM and gave me around 35Knots max.
I never actually managed to find a prop that suited the boat/engine combination.
I was constantly running around at WOT to keep it on the boil and could only back off WOT very slightly to cruise at around 25Knots.
Harbours, or any sort of speed restriction, were a nightmare as it would oil up after 5 mins. of slow running

The Suzi is averaging @1.2l per NM, and Iíve seen 52Knots on the GPS.
It obviously gets the boat up on the plane a lot easier and is loads quieter.
Iím now cruising at 25knots and around 1/2 - 3/4 throttle at 3500 Ė 4000RPM
The engine came with a 22inch pitch stainless prop that appears to be spot on.
Iím slightly disappointed with the slow speed control, partly as its doing 6Knots the moment it goes into gear, but as Mr Halliday pointed out, thatís probably more about me than a fault with the engine.

There is still some work for me to do to get it exactly how I want it, but at the moment itís like having a new boat again.

Nasher.
__________________

__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 05 September 2005, 07:29   #2
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by Nasher
Some of you know that I spent a good part of the beginning of this year converting my Ocean 6.25 to take the Suzuki 200HP EFI Iíd picked up cheap to replace my old Johnson 150VRO.

Now Iíve used it a few times I thought Iíd pass on some findings.

The Ocean is a heavily built boat in my opinion, and has a good sea-going hull rather than an out and out sports hull, just what I wanted when I picked it up in a sorry state 2 years ago. The Johnson 150VRO fitted was always going to be changed.

The VRO used loads of fuel, @2 to 2.5l per NM and gave me around 35Knots max.
I never actually managed to find a prop that suited the boat/engine combination.
I was constantly running around at WOT to keep it on the boil and could only back off WOT very slightly to cruise at around 25Knots.
Harbours, or any sort of speed restriction, were a nightmare as it would oil up after 5 mins. of slow running

The Suzi is averaging @1.2l per NM, and Iíve seen 52Knots on the GPS.
It obviously gets the boat up on the plane a lot easier and is loads quieter.
Iím now cruising at 25knots and around 1/2 - 3/4 throttle at 3500 Ė 4000RPM
The engine came with a 22inch pitch stainless prop that appears to be spot on.
Iím slightly disappointed with the slow speed control, partly as its doing 6Knots the moment it goes into gear, but as Mr Halliday pointed out, thatís probably more about me than a fault with the engine.

There is still some work for me to do to get it exactly how I want it, but at the moment itís like having a new boat again.

Nasher.
Nasher, I'd say that she's tickin over a little too high, which wont do the gearbox a lot of good when engaging gear. Not sure what you're saying about the prop. If it's a 22P then thats quite a high pitch prop, also adding to the high boatspeed at tickover. I tried a 23P on a 21ft hardboat that I had with a 260hp V8 inboard and the thing couldn't get on the plane, it would of flown if it had. 21P was the optimum. However your Rib would be much lighter. I'm running a 19P on my rib and she "Trols" at just under 3knts at tickover, just right for mackerel :-)
__________________

__________________
Mollers is offline   Reply With Quote
Old 05 September 2005, 07:33   #3
Member
 
Country: UK - England
Town: Newquay, Cornwall.
Boat name: None :(
Make: None :(
Length: 5m +
Engine: None :(
MMSI: None :(
Join Date: Jun 2005
Posts: 1,280
Quote:
Originally Posted by Nasher
Iíve seen 52Knots on the GPS.
Quote:
Originally Posted by Nasher
Iím now cruising at 25knots and around 1/2 - 3/4 throttle at 3500 Ė 4000RPM
Without even taking aditional slip into account if you are doing 25 knots at 3500 - 4000 rpm then when you were doing 52 knots your engine would have to have been at least at 7280 - 8320.

Is that even possible on a suzuki 200 i thought its max WOT rpm was around 5600 or 6000.

I cant imagine it would be doing it much good at 8000 rpm.
roycruse is offline   Reply With Quote
Old 05 September 2005, 07:44   #4
Member
 
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: 4,147
Guys

They are all approx figures taken as an average in a wide range of sea conditions. Perhaps my Farina revcounter isn't very accurate mid range.

She ticks over between 500 and 750 and maxes out at around 6500.

I don't know the make of the stainless prop so can only comment on how it appears to work well on the boat.

Most important she sounds 'happy' and I'm happy.

Nasher
__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 05 September 2005, 07:48   #5
Member
 
Country: UK - England
Town: Newquay, Cornwall.
Boat name: None :(
Make: None :(
Length: 5m +
Engine: None :(
MMSI: None :(
Join Date: Jun 2005
Posts: 1,280
Quote:
Originally Posted by Nasher
Most important she sounds 'happy' and I'm happy.
That is after all - what its all about
roycruse is offline   Reply With Quote
Old 05 September 2005, 08:54   #6
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Thanks for the feedback - will be interesting to see how my 225efi compares!!!
__________________

__________________
codprawn is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:45.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.