Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 22-06-2012, 18:06   #1
Marine Service Provider
beiland's Avatar

Join Date: Aug 2007
Location: St Augustine, FL, Thailand
Boat: 65 Sailing/Fishing catamaran
Posts: 905
Running Hot...oil that is, good or bad?

I was cruising thru Popular Science mag just recently and ran across this 'invention award' for the Over7, "a system that by redirecting and then heating an engine's oil cuts gas consumption by 7% and emissions by up to 30 percent"]2012

I'll bet this sparks some debate

beiland is online now   Reply With Quote
Old 22-06-2012, 18:54   #2
Registered User

Join Date: May 2009
Location: Massachusetts
Boat: 40' Silverton Aftcabin with twin Crusaders
Posts: 1,444
Re: Running Hot...oil that is, good or bad?

I don't know about engines but I do know that my ancient Ford Econovan came standard from Ford with a transmission oil cooler.

foggysail is offline   Reply With Quote
Old 22-06-2012, 21:28   #3
Registered User

Join Date: Oct 2011
Posts: 2,044
Re: Running Hot...oil that is, good or bad?

Colder oil has much more friction than oil at the proper temperature. The question is "what is proper temp". Max oil temp is usually stated in an operators manual, but normal operating temp may or may not be listed. I suspect that raw water cooled engines could gain some milage if there oil ran at a higher temp, but fresh water cooled engines almost always have an oil cooler in the system that keeps the oil from getting too hot. What most people dont realize is that when at start up the oil cooler actually heats the oil up to operating temp quicker than if there was not an oil cooler. The oil cooler or heat exchanger uses the fresh water part of the system to keep the oil temp stable. When you are first running an engine the coolent water gets up to temp before the oil does, so the heat exchanger transfers that heat to the oil to bring it up to normal. This cuts down on friction and wear on the engine, which makes your engine run better and last longer. I am sure someone can give a clearer explanation than this._____Grant.
gjordan is offline   Reply With Quote
Old 23-06-2012, 00:11   #4
Registered User
leftbrainstuff's Avatar

Join Date: May 2011
Location: San Francisco and Australia
Boat: Liberty 458
Posts: 1,595
The primary function of your oil is to support a compressive load to stop parts with relative motion from touching. (minimise wear)

Ideally you want this to occur with minimum shear forces on the oil. (minimum friction)

Most oils can only achieve this within a small temperature difference. (20 - 30 degrees)
leftbrainstuff is online now   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

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 17:21.

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.