Reply
 
Thread Tools Search this Thread
 
Old 04 June 2009, 16:22   #1
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
avon sr5.4 engine height

i have a little problem when im going 3/4 to full throttle, im getting alot of water being pumped over the transom right under the outboard,has anyone had this before, the only thing i can think is the motors to low but the cavitation plate is not far of inline with the bottom line of the hull ?????
__________________

__________________
tim2658 is offline   Reply With Quote
Old 04 June 2009, 16:32   #2
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
water over stern

Yep, ours used to do that, sort of bubbles over the transom after 3/4 throttle. We had an optimax 90hp on a 5.4m. Only did it with the 90hp opti, not with an old 2 stroke 75. Never figured out why it did it sorry, but it didn't always happen. Only thing i could figure was either weight distribution or just bad design for that bracket of speed. They bloody shift, great boat.

We never bothered sorting it as the transom was so low on the SR and with no well at the back, water was always sloshing round.

There are many SR owners here, some with 115hp on the back so I'm sure they will give you a more detailed answer or importantly solution!!!
__________________

__________________
HUMBER P4VWL is offline   Reply With Quote
Old 04 June 2009, 16:36   #3
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
cheers paul your right she does shift lol !, looks like i might cut out a well then ,cheers tim
__________________
tim2658 is offline   Reply With Quote
Old 04 June 2009, 16:55   #4
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
cut a well

Not sure what to make of that. Ask others before doing it unless you know what you are doing. However it would be a handy addition, we never wanted to change from standard.

Have you sealed up the back to stop the inner hull flooding? this helps massively at slow manouvering with regards to water over the back. Also gets up on the plane quicker.

We bought a new SR 5.4 back in about 1999, can't quite remember but i think the transom plate said max hp 90. That was before the modern fueled injected 2 strokes. There is a high possiblity that the power is too much and the speed so high that hull design causes the water.

On your own with one tank, it used to be like a rocket on the flat. Never had a speedo but i'm sure just as fast as our humber 6.3 with a 150. (Though not in the waves) I do miss it on calm or choppy days.

JSP a member on here has a 5.4 with a 115, pm him and ask how he fares?
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 04 June 2009, 17:03   #5
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
no i was only joking paul about the well its just took me long enough to put the new deck in, i think i might take it up a bolt hole tomorrow and have a play, im really tempted to block the hull up did it make it that much better .
__________________
tim2658 is offline   Reply With Quote
Old 04 June 2009, 17:16   #6
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
sink or float

i thought so. we ran it sinking for 2 years then i got fed up with low transom height and bow lift when getting up on plane. If you think of the weight that falls to the back then has to drain out, it is significant. We used to ski a lot and it was so annoying, as when people dont get up, you are from standing start to on the plane all the time.

You can get up on the plane so much quicker, then throttle back off much earlier. If you blast about from standstil to plane on and off all day (which we did) think of the fuel you will save!!

Obviously there is the arguement that if you just cruise, once the water is out its is out.

Just try it, there is a kit you can get to plug the front holes and another bit for the back. Can easily be removed. Though we found the back bit crap and only used it for one year. After that we glassed it up and put a screw bung in just to drain any bits out that seep in etc at the end of the season.

Good luck.
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 04 June 2009, 17:20   #7
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
cheers paul for that very helpful ,any idea where you can this kit from
__________________
tim2658 is offline   Reply With Quote
Old 04 June 2009, 17:31   #8
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
This was where we bought our boat from in 1998 ish. Think we got the kit from them. Give them a call.



Premier Avon Dealer & Rib Centre Boats & Yachts Website
Oakley Wharf Porthmadog Gwynedd LL49 9AY
Tel :01766513545

Established in 1980, Glaslyn Marine specialises in Chandlery with the emphasis on accessories and safety equipment. During 1990 it expanded into Inflatables and Liferafts, with the addition of a Service Station to its credits the following year.
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 04 June 2009, 17:36   #9
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
thanks very much paul i will give them ago, many thanks tim
__________________
tim2658 is offline   Reply With Quote
Old 04 June 2009, 18:03   #10
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
Quote:
Originally Posted by HUMBER P4VWL View Post
We bought a new SR 5.4 back in about 1999, can't quite remember but i think the transom plate said max hp 90. That was before the modern fueled injected 2 strokes. There is a high possiblity that the power is too much and the speed so high that hull design causes the water.
Nah, the modern injected strokers put out bang on their rated HP whereas the older ones are usually a little more than their rated HP.
__________________
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
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 23:32.


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