Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 03-07-2009, 08:35   #1
Registered User

Join Date: Jun 2009
Location: Central/lower Earth
Boat: 1970 42' ChoeyLee
Posts: 28
Diesel Injector Changes

Good morning, I have heard that by changing the fuel injectors on the engine, that fuel consumption can be lessened or increased depending on the need/use of the engine. Could someone help clarify this for me? I have a Perkins M-65 Diesel and presently use about 1/2 gallon an hour at 8-850rpm pushing me at about 3.5 kn. Thanks in advance for the help.

Nirvava is offline   Reply With Quote
Old 03-07-2009, 08:43   #2
Registered User
anjou's Avatar

Join Date: Apr 2009
Location: Malvernshire, on the sunny side of the hill.
Boat: 50' steel canal and river cruiser
Posts: 1,905
The pressure setting and nozzle size will increase or decrease the fuel used, but thats usually varied in relation to other adjustments like the fuel pump setting and turbo boost pressure, where applicable

anjou is offline   Reply With Quote
Old 03-07-2009, 09:52   #3
Registered User

Join Date: Jun 2009
Location: Central/lower Earth
Boat: 1970 42' ChoeyLee
Posts: 28
So it isn't as easy as having a second set of injectors aboard?
Nirvava is offline   Reply With Quote
Old 03-07-2009, 10:11   #4
Registered User
fareweather's Avatar

Join Date: Jan 2008
Location: Colorado
Boat: Manta 40
Posts: 107
You most likely wont be changing the injector just the nozzles that are the very tip. It is common that engines come from the factory "detuned" and adding things like larger nozzles can actually give you better mileage but I wouldn't mess with it. More fuel without more air is going to increase your EGTs (exhaust gas temps) which is bad for a diesel.

You don't have a turbo on that one but it is a direct injection engine which is much more efficient than the IDIs so to answer your question yes you can change the nozzle size but it's not as simple as that. If you do mess with it install an EGT gauge before the mods and keep track of what's going on after the mods. If you can't do the labor yourself you'll be throwing money out the window.

For ex: I have installed larger nozzles on a TDI that I am working on but I also have installed a higher flow turbo, a custom injection pump (with a manually adjustable max fuel screw) and an EGT guage to keep track of what the mods are doing to the EGTs.
Moderators are cool.
fareweather is offline   Reply With Quote

Thread Tools
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
Perkins Injector Removal Finner Engines and Propulsion Systems 15 22-04-2010 14:01
Perkins 4.108 #3 Injector Failure marineruscg Engines and Propulsion Systems 12 16-06-2009 11:53
Diesel injector pump mestrezat Engines and Propulsion Systems 2 16-12-2008 12:28
Fuel Injector Servicing Chief Engineer Classifieds Archive 2 27-07-2007 18:55
Injector inspection?? Wmiii Engines and Propulsion Systems 23 29-01-2007 02:59

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 -7. The time now is 15:07.

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

ShowCase vBulletin Plugins by Drive Thru Online, Inc.