Thread Tools Search this Thread
Old 05 August 2011, 05:54   #1
Country: UK - England
Town: poole
Boat name: Wacky 1
Make: Flatacraft
Length: 3m +
Engine: 25hp mariner outboar
Join Date: Jun 2010
Posts: 28
More power!!

Guys ive heard talk of 25hp and 30hp engines being exactly the same, but with minor differences on the 25hp to reduce power.
is this true? is it easy to make the 25 have the full 30 horses?
oh and do the extra 5 horses weigh much??

joetheweed is offline   Reply With Quote
Old 05 August 2011, 09:59   #2
Country: UK - Scotland
Town: Isle of Lewis
Boat name: Fiona
Make: Avon SR
Length: 5m +
Engine: Yamaha 90AETO
Join Date: Aug 2009
Posts: 38
There are some engines that have the same block as a greater powered engine. It's usually the carbs that are different and I wouldn't expect them to way more. Dont think it's really worth doing unless you have the greater powered engine lying around with a knackered block.

crazymac680 is offline   Reply With Quote
Old 05 August 2011, 10:03   #3
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,539
Depends on the engine. It can vary from a simple restrictor plate to a replacing half the engine.

Some also limit the spark advance on the 25, and as you generally can't reprogramme the CDIs that becomes a chuffing expensive component swap.

Also check the brochures of your engine (I assume the Mariner). Not all manufacturers twinned those two on the same block!

Have a search here - there's a few posts about this game.....
9D280 is offline   Reply With Quote

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

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 17:51.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.