Personally I don't think having your engine oil that cool is really good for the engine... The engine needs to be at its optimum temperature to operate as efficiently as it can and also to operate how it was designed. 122 may be within operating temperature for oil but to be honest I do not know...

 

Thanks for your input! Does anyone know the spec'ed operating range for the Evo 9 engine oil? I've always thought cooler was better, and that's why we have oil coolers

 

i know at lapping days mine hits 240 i wouldnt be very concerned about yours being in the 100 degree range at all ,,.

Pretty sure if its good enough for the factory it should be good enough for you they wont be putting something on there that decreases your engine life.

 

ok, I am pretty sure about the benefits of cooler oil, I am just worried about whether it will be dangerous aerodynamically to go tracking with no undertray. "Good enough" for the factory is a relative thing. All products are (or should be) engineered with a target life expectancy, and I think I can greatly extend the life of my engine with cooler oil. A big point to remember is that life expectancy is an exponential (or maybe a power-based) curve relative to stress. Heat is one type of stress that an engine is subjected to. I recently made a project that required an incandescent light bulb. I bought some bulbs that were rated for 50 hours at 12 volts. I run it at 8.5 volts though and my little project has been illuminated 24/7 with the same bulb since January 8, 2009. I don't know if it will ever burn out Granted, an engine is a lot more complicated than a light bulb, but I believe it would obey a similar stress vs lifetime rule. Everything else seems to! I've also done a little google research and found, for example, the life expectancy of an electric fan follows a non-linear curve when plotted against ambient temperature. The curve I saw was either exponential or power. It was too small of a section for me to tell.

 

Im sure cool oil will help with longevity to a point so maybe add an cooler radiator thermostat as well ,,,
If all your doing currently is street driving the car i highly dought you can make a difference , maybe in a highly modded evo that sees a lot of track time you will have to worry but it doesnt seem like that is your main concern.
The undertray makes a noticeable difference ive driven the car both ways and having it on is more stable and does indeed cool the brakes.

 

OK, I think I stuck my foot in my mouth in a really big way. Anyone have a foot removal tool I can borrow? I did some more internet research, and found out that running a gasoline engine too cool can actually cause excess wear. This is why they make oil cooler thermostats. Getsideways, sorry I doubted you man! The turning point for me was finding out the engine could actually be damaged if the oil & coolant is kept too cold. I was thinking before that it would extend engine life, even though it would not be running optimally. So does anyone know if a stock Evo 9 MR has an oil cooler thermostat? A stuck-open thermostat could also explain why my oil temp is so low, and the missing undertray could just be a coincidence. In either case, I want the undertray back. I will either try to get the undertray back from the shop if they haven't tossed it, or buy the beatrush thingy. Does the beatrush make oil changes a pain? I think I read somewhere in this thread that it covers up the oil filter.

 

https://www.evolutionm.net/forums/en...-race-car.html

 

I think this thread got off base a bit. Not saying info stated above wasn't valid, but I thought this thread was for undertrays and diffusers. I am very interested in designs for the front undertray and rear diffuser. I am developing my own and will post pics as soon as I can. Time and effort are my killers. Anyway, I hope whoever is doing this in a systematic and scientific approach would be awesome brings what they have to the table.

 

anyone know if the beatrush tray will make oil changes a pain (ie will it cover up the oil filter and the drain plug)?

 

Yes the Beatrush Undertray will cover the oil filter & drain plug. The rear tray needs to be removed for oil changes. Attaching the tray with DZUZ fasteners will make it easier to take on and off.

Dan (drb)

 

sorry for being so noobish, but what are DZUZ fasteners, and where can you get them? Are they generally available at parts stores? Thanks!

 

They are quarter turn fasteners. The ones with the D-Handle can be installed and removed by hand - no tools required. There are several threads showing how to use these, here is one of them:

https://www.evolutionm.net/forums/ev...fasteners.html

Dan (drb)