Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 18-01-2020, 00:18   #31
Registered User

Join Date: Mar 2018
Location: New Zealand
Boat: 50 Bavaria
Posts: 1,722
Re: 1 1/4" through hull, what the heck?

Correct, the pump only works to raise the head of water. It's irrelevant how wide the inlet pipe is. If you think about it, you can consider the next three feet under the hull as if it were a bit more pipe but the diameter of the boat's length.

The one difference that does apply is that friction within the pipe will affect the amount of work the pump has to do -- a larger pipe is easier for the pump to suck through (as NorthCoastJoe said above). Again, just think how much harder this would be through a very very narrow hose.

Increasing the inlet and/or hose size will make life easier for the pump (particularly if it gets partially blocked) but won't affect the engine at all. Not the same thing as changing back pressure in the exhaust at all.

Tillsbury is online now   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
"recent price reduction""owner anxious""bring all offers" sailorboy1 Dollars & Cents 15 06-11-2019 05:06
Through hull fittings - How much "play/distance" is ok? Cpt. Black SOL Plumbing Systems and Fixtures 17 29-04-2018 18:23
For Sale: 37'5" Aluminum mast (8" x 4-1/2") from 32' Coronado "tall rig" Duece General Classifieds (no boats) 0 27-01-2018 16:12
Measure speed through water without making hole through hull. Lars_L Construction, Maintenance & Refit 29 26-03-2015 11:58
For Sale: "Santa Cruz Sails" 26' 8" x 24' 10" x 15' 3" Genoa Cut Sail Joy Devlin Classifieds Archive 0 19-06-2012 16:22

Advertise Here

All times are GMT -7. The time now is 19:32.

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

ShowCase vBulletin Plugins by Drive Thru Online, Inc.