Is bigger better? (Engine size) - SailNet Community
LinkBack Thread Tools
post #1 of 3 Old 03-06-2009 Thread Starter
Join Date: Jul 2002
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Is bigger better? (Engine size)

I am new to Newports, and am looking at an 81 N30. It is mostly in good condition, but the engine is a Universal Diesel model 5411. My research show that standard engines in the N30 were 14-20hp, not 11hp of this motor.
I would appreciate any thoughts on whether this motor is powerful enough for this boat. (my cruising is the Puget Sound in WA). Also, I would appreciate your thought on engine noise, as this is one of the reasons my wife doesn't like going out in our current Catalina 25 w/ outboard.
Thanks in advance,
cclark is offline  
Sponsored Links
post #2 of 3 Old 03-06-2009
Senior Member
chucklesR's Avatar
Join Date: Sep 2007
Location: Pasadena Md - Magothy side
Posts: 5,979
Thanks: 10
Thanked 31 Times in 31 Posts
Rep Power: 15
Bigger is better up to a point. The point is economy and hull speed driven.
The ideal is to be able to get to hull speed at the sweet spot in RPM where your engine is most efficient.
That point depends on engine, hull shape etc.
I would suggest that 11 hp is not up to snuff, especially in a head wind.

The rule of thumb is 2 hp per 1000 pound so weight, bringing you to 20 or so as a normal engine.

Lessons learned are opportunities earned.
chucklesR is offline  
post #3 of 3 Old 03-06-2009
Super Fuzzy Moderator
tdw's Avatar
Join Date: Oct 2006
Location: Sydney Australia
Posts: 17,137
Thanks: 22
Thanked 129 Times in 120 Posts
Rep Power: 10
The Womboat is 12,000lbs runs a Bukh DV24. Great little engine but if I were to re-engine then I'd go 30. Ours is 20 years old and the newer models tend to weigh less for the same output.

I'm sure that for getting in and out of a dock 11hp would do for that boat but it is as Chuckles pointed out going to struggle in adverse conditions.

Andrew B (Malö 39 Classic)

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett.
tdw is offline  

Quick Reply

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bigger is better & faster? BeejDeC General Discussion (sailing related) 22 09-10-2015 10:25 AM
Is bigger always better? Nordica 20 cstpt General Discussion (sailing related) 21 08-31-2014 08:20 AM
*Thinking* about a bigger, better boat arf145 Boat Review and Purchase Forum 74 05-10-2013 04:19 PM
More bigger better batteries again! Joesaila Gear & Maintenance 2 04-23-2008 06:53 AM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome