Noria Corporation    Forums  Hop To Forum Categories  Lubrication  Hop To Forums  Car and Truck Lubrication    What is the min and max oil temperature
Go
New
Find
Notify
Tools
Reply
  
What is the min and max oil temperature
 Login/Join
 
Level 1 - 1 to 50 posts
posted
I find myself seeking the Internet with this question but can't find an answer. A bunch of us on another board who run performance and regular engines (cars) are trying to determine exactly what temps our oil should be. The discussion started with oil coolers and then came to the point of exactly what should the temperature be.

We hear that engine blow by creates moisture in the oil so the oil needs to be hot enough to remove that water. We also hear that oil should be cool enough to keep the engine internals cool as well, but not too cool. We hear that oil breaks down at anywhere between 240 to 270. We just do not have the answer....I found this board and you all seem to know a lot about oil....can anyone answer this one for us.?

Brad
 
Posts: 1 | Registered: Thu September 22 2005Reply With QuoteReport This Post
Level 1 - 1 to 50 posts
posted Hide Post
It's always hard to find an end all be answer to your questions because there is no one size fits all answer.

Understand that when you measure your oil temperature, you are measuring the "average temperature usually in an oil gallery just post oil cooler and oil pump, but without any load on the oil." If you could measure the oil temperature when it is under stress, say in a camshaft/lifter interface, you would find that the spot temperature is much higher than the average temperature, but only for a micro second, then the oil mixes with other lower temperature surrounding oil and averages out.

Oil will oxidize/degrade at room temperature, only the reaction rate is very slow. As the temperature and pressure increases, the reaction rate increases, especially when the average oil temperature gets above about 250°F for any length of time. The longer oil stays hotter the faster it generally degrades.

Chumley
 
Posts: 30 | Registered: Tue July 26 2005Reply With QuoteReport This Post
Level 3 - 101 to 250 posts
posted Hide Post
Don't forget as well, what we might think of as "hot" is all relative as well. Given just how hot the combustion chamber can get under a severe load and or high speed, oil temperature, even if at 240F would seem downright "cold" in actually.

I also thought that oil could see an average of 300F in severe climates and/or conditions, hence why we look for a product with a relatively high flash point, right?
 
Posts: 159 | Location: Glenshaw, PA, USA | Registered: Mon March 01 2004Reply With QuoteReport This Post
Level 3 - 101 to 250 posts
posted Hide Post
dad flash point has nothing to do with operating temp of oil it is only good
in one way as a method of compariosn higher usally means a better or higher quality base stock.
operating temp in a engine showld be minimun for 212F to aprox 240F
bruce
 
Posts: 230 | Location: SF Bay Area | Registered: Fri July 15 2005Reply With QuoteReport This Post
Level 3 - 101 to 250 posts
posted Hide Post
If Max bhp is achieved at a water temp of say 90-100c then then the oil will normally be at a slightly higher temp.

To run at a higher water temp will reduce bhp but additional cooling adds weight, so a trade is made between weight and bhp.

Oil will usually run at 90-150c which should not be an issue for synthetic especially ester based, a mineral perhaps should be limited to 130c.

If the oil is run constantly at 110c and above an oil cooler will help maintain viscosity.

To help maintain viscosity at high temps and deal with fuel dilution (thins oil) with carbs or endurance racing then a thicker viscosity oil can be used. This has a downside as a thicker oil runs hotter. An alternative is to use a better quality ester based oil (usually race oils eg Millers, Silkolene, Motul, Redline).
 
Posts: 215 | Registered: Sat September 11 2004Reply With QuoteReport This Post
Level 3 - 101 to 250 posts
posted Hide Post
Ok, I understand you both MGBV8 and bruce381. Thanks for the clarification and reinforcment of how better basestock=better product. Smile
 
Posts: 159 | Location: Glenshaw, PA, USA | Registered: Mon March 01 2004Reply With QuoteReport This Post
  Powered by Social Strata  
 

Noria Corporation    Forums  Hop To Forum Categories  Lubrication  Hop To Forums  Car and Truck Lubrication    What is the min and max oil temperature


 
 

Machinery Lubrication | Reliable Plant
Resources: Oil Filter | Motor Oil | Synthetic Oil | Hydraulic Fluid | Hydraulic System Troubleshooting

© Noria Corporation. All Rights Reserved.