Reply
 
Thread Tools Search this Thread
 
Old 07 December 2006, 19:56   #11
Member
 
Country: USA
Town: Marblehead, MA
Boat name: Bouncy Pumpkin
Make: Avon Searider 5.4
Length: 5m +
Engine: Evinrude 90 E-TEC
Join Date: Sep 2004
Posts: 390
Quote:
Originally Posted by Biggles View Post
DC I've used the 75 HP Mariner 2 stroke on a 5.4 and I was satisfied. Speed wise was the same as my 4m SR with a 50 on the back, but the boat was more sea worthy.

Don't write off the 75 its a good engine on that boat. Not the fastest but allows you to do everything you want with a 5.4.
A new 75 will be about the same as the 26 year old 80 that's hanging back there now. It's almost always enough power, but there have been plenty times when I felt the boat was clearly capable of handling more. Sometimes in flat water, but particularly while towing sailboats, which is a major use of the boat. It'll be enough, but will I kick myself for not spending the extra, when I'm already spending so much??

I think the answer is yes!

DM running a 115 and wanting more just pushes my button even more.
__________________

__________________
dctucker is offline   Reply With Quote
Old 08 December 2006, 01:32   #12
Member
 
Country: USA
Boat name: The Boot
Make: Avon SR5.4
Length: 5m +
Engine: Suzuki DF70
Join Date: Aug 2005
Posts: 270
For me I'd look at the fuel economy between a 90 and 70. I've got a 70 hp Johnson 2stroke and its plenty of power but I don't tow sailboats. A 90 would be nice if I could get the same fuel economy plus the extra power when its needed. Otherwise most of the time I'm trying to run at the most fuel economical range. For me its mostly about fuel economy short of buying a 4 stroke for now
__________________

__________________
boatster_sr4 is offline   Reply With Quote
Old 08 December 2006, 18:37   #13
Member
 
Country: USA
Town: Marblehead, MA
Boat name: Bouncy Pumpkin
Make: Avon Searider 5.4
Length: 5m +
Engine: Evinrude 90 E-TEC
Join Date: Sep 2004
Posts: 390
Quote:
Originally Posted by boatster_sr4 View Post
For me I'd look at the fuel economy between a 90 and 70. I've got a 70 hp Johnson 2stroke and its plenty of power but I don't tow sailboats. A 90 would be nice if I could get the same fuel economy plus the extra power when its needed. Otherwise most of the time I'm trying to run at the most fuel economical range. For me its mostly about fuel economy short of buying a 4 stroke for now
Hence the choice of the direct injected E-TEC two stroke, which is as clean and economical as a 4 stroke (some would argue more so), at a substantial weight savings.

ANY new tech motor (DI 2 or 4 stroke) is going to be one hell of a lot more economical than your old 70 or my old 80 carburated guzzlers! Most reports I've read indicate increased cruising range of 50% - 70% on a this sort of repower to the E-TEC. I've heard 90 & 150 E-TECs at idle and cruising speed, they're also amazingly quiet in comparison to our old motors, very similar to 4 strokes.

Most of my use is idling around, following sailboats upwind, then high displacement or low planing speed following them downwind, with occasional relatively brief high speed blasts, setting race marks and such. I'd go through 7-10 gallons/day doing this with the old Merc. I expect to see that drop to 3-5 gallons/day.

I want the power to be able to tow a heavy keelboat (Sonar or J/24, ~2500-3000 lb) at planing speed, or in case of a need for high speed emergency response. I've also had to do high speed mid-distance runs for spare parts, where speed is hugely important

The E-TEC 75 and 90 are the same motor, but for a different ECU and intake, as far as I've been able to discern. Other than at WOT, the should be equally economical.
__________________
dctucker is offline   Reply With Quote
Old 09 December 2006, 03:58   #14
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Do I remember someone saying that 5.4's used to be rated up to 115hp but Avon downrated them?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 09 December 2006, 16:48   #15
Member
 
Country: USA
Town: Marblehead, MA
Boat name: Bouncy Pumpkin
Make: Avon Searider 5.4
Length: 5m +
Engine: Evinrude 90 E-TEC
Join Date: Sep 2004
Posts: 390
Quote:
Originally Posted by Nos4r2 View Post
Do I remember someone saying that 5.4's used to be rated up to 115hp but Avon downrated them?
I thought that was the other way around?? Let's not open that can of worms in my mind please! I'm placing the order this Friday, come hell or high water. Boat needs to be ready to roll to Florida on 11 January.
__________________
dctucker is offline   Reply With Quote
Old 11 December 2006, 18:13   #16
Member
 
Lets go boating's Avatar
 
Country: UK - England
Town: Staffordshire
Boat name: Cambrian Explorer
Make: Ribtec
Length: 6m +
Engine: 130hp honda outboard
Join Date: Oct 2005
Posts: 591
i've got a 75 4/ on mine.
__________________
Powerboat/PWC Instructor
Advance Commercial Skipper
Gregbutler08@aol.com
Lets go boating is offline   Reply With Quote
Old 11 December 2006, 18:49   #17
Member
 
Country: UK - England
Town: Exmouth, Devon
Length: no boat
Join Date: Oct 2004
Posts: 765
Quote:
Originally Posted by davidmanning View Post
115hp Yamaha V4.
I'd rather have had the Yamaha 130hp V4
40+knots and no chine walking possibly because the fuel tank was mid mounted, plenty of anchor/chain up front, no heavy A frame on the back and the engine is a good match for the rib.
DM
. . . and still going! Not quite 40+ but high 30s. Fuel consumption is a bit strong though.

As David says, with the 115 you do need to keep it balanced with weight up front and also best with sealed hull. It can sit very low at the back without that.

A sound 90 is a good compromise and the 30Kg or so weight saving will help.
__________________
www.allgadgets.co.uk
Tel 01395 227727
MikeCC is offline   Reply With Quote
Old 11 December 2006, 18:51   #18
Member
 
Country: UK - England
Town: Exmouth, Devon
Length: no boat
Join Date: Oct 2004
Posts: 765
Quote:
Originally Posted by Nos4r2 View Post
Do I remember someone saying that 5.4's used to be rated up to 115hp but Avon downrated them?
I believe current rating is 90 but the rating was also based on the weight of the engine, so the Yam 115 V4 just scraped in.
__________________
www.allgadgets.co.uk
Tel 01395 227727
MikeCC is offline   Reply With Quote
Old 12 December 2006, 02:13   #19
Member
 
Country: UK - England
Town: Salisbury, Wiltshire
Boat name: Ocean Devil
Make: Scorpion
Length: 8m +
Engine: 300+ Yanmar Inboard
MMSI: 2350400611
Join Date: Aug 2004
Posts: 52
I don't think weight will be an issue, I had twin Evenrude 55s Commercials on mine.
I sealed the hull and took a lot of time setting up the height. I filled the transome recesss with hardwood and stainless dowels, glassed over and put stainless sheeting over the lot.
It went very well and didn't chine walk.
Have fun
Jon
__________________

__________________
Jon Adlard 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 22:44.


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