Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 24-07-2020, 09:16 PM   #1
Registered User
 

Join Date: Apr 2020
Posts: 4
Propeller pitch

Hi all!
Bit of advice needed... again.
I have a ring 20 with a 150hp Yamaha 2 stroke outboard. It came with a 13 3/4 x 17 prop but I had a quicksilver Mercury stainless laser 14 1/4 x 23 so changed it over to this. Im struggling to get any more over 40mph revving at around 4000rpm been told the engine will rev to 6000rpm. Anyone got any advice on getting more top end speed or what pitch prop I should be using?
__________________

Mrb15 is offline   Reply With Quote
Old 29-07-2020, 04:46 PM   #2
Registered User
 
Childsy's Avatar
 
Country: Uk, sometimes Dubai
Location: Newmarket, Suffolk
Occupation: Racehorse Exercise Rider
Interests: Powerboating, Squash, Running, Horseracing
Boat name: FAT BOY
Boat make: Cougar 27'
Engines: EVINRUDE G2 300
Cruising area: Orwell, Harwich, East Coast

Join Date: Sep 2012
Location: Newmarket, Suffolk
Posts: 225
Send a message via AIM to Childsy
[QUOTE=Mrb15;272446]Hi all!
Bit of advice needed... again.
I have a ring 20 with a 150hp Yamaha 2 stroke outboard. It came with a 13 3/4 x 17 prop but I had a quicksilver Mercury stainless laser 14 1/4 x 23 so changed it over to this. Im struggling to get any more over 40mph revving at around 4000rpm been told the engine will rev to 6000rpm. Anyone got any advice on getting more top end speed or what pitch prop I should be using?[/QU
What results were you getting from 13&3/4 x 17... ??
The larger prop may be your problem causing your motor to struggle to rev where you want it to be, put a smaller prop on and see where you go with that, if you still getting only 4000 rpm then you might have an issue with your motor...
__________________

Childsy is offline   Reply With Quote
Old 30-07-2020, 10:42 PM   #3
Registered User
 
glen76's Avatar
 
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent

Join Date: Mar 2004
Location: southampton
Posts: 1,347
How high is engine on transom too
glen76 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 09:53 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×