Oil cooler thermostat? - Page 8 - RX8Club.com



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Old 04-18-2017, 12:55 PM   #176
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Quote:
Originally Posted by 9krpmrx8 View Post
There are not big differences between the locations, I have measured (for years now in South Texas) from the oil pan, the oil filter housing (both stock and my remote mounted filter) and at the oil cooler feed on the block. The temps are all about the same thru various oil cooler setups. The only place you will see a noticeable difference is at the pan when the car is idling after a hard run, then the temps creep up due to no flow thru the coolers.

Theory is one thing, actual data is another.
The only places I would expect to see significant deltas are after the cooler(s) (coolest) and inside the engine (hottest). The rest of the circulating oil should be pretty close to the pan temp.
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Old 04-18-2017, 01:22 PM   #177
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Yeah I had it post cooler on the oil filter housing (return) and so no real difference compared to pre cooler in spirited street driving. The only time you will see temps climb are in the upper rev range for extended periods and even the stock coolers do a good job of dropping those temps back down once you let off and get a couple seconds of air thru them.

That depends on the track though, I can see oil temps staying extended on a short track with few straights in high temps. But on a stock street driven car oil cooler modifications are useless as the stock system works great. People should instead focus on using good oil and changing it often.
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Old 04-18-2017, 08:02 PM   #178
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Honestly, I have never paid much attention to my 8's oil temp. I have simply judged it by the condition of the oil. After 1,000 miles of driving to, on, and from the track, it still looks amber. After 3,000 miles of street driving, it still looks amber. It never looks more than a little dirty, so I figure it is not getting hot enough to varnish or start to break down, and all of the Blackstone reports have been good. Based on those indicators, I choose not to worry about it.
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Old 04-19-2017, 08:06 AM   #179
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These oil cooler thermostats are not going to radically change the oil temps throughout the system. Modded FD customers of my rotary wrench found them helpful in an overall modified cooling system, like I now have on my RX8. They are not for everyone, but for the way I drive and use my RX8 they do add a small benefit.

BTW Steve and 9krpmrx8 , I will be moving to Grapevine, TX. by the end of the summer. Look forward to meeting you Texas folks and we can share knowledge, discuss and argue stuff in person. LOL
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Old 04-19-2017, 08:41 AM   #180
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^ Let us know if you notice anything like condensation in your oil. If you use these with no problems at all, I might follow suit. Rotary Performance is pretty close to my office, so I can run over there and pick up a pair at any time.

Welcome to Texas! You're gonna like it here. Nice people, low(er) stress, wide open spaces, and pretty girls. What's not to like? Grapevine is a great area. You will be about 30 mins away from me.

Be forewarned. Once you are here, I will start dragging you to the track. We don't have any 8s out there right now, and we need to remedy that!
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Old 04-19-2017, 08:49 AM   #181
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I will keep the forum informed on how these perform. So far after a couple thousand miles with them installed, no oil condensation.

I am looking forward to the move and hanging with the RX8 crowd there. I have lots of family there also. Yes I have noticed the less stressful lifestyle and the loads of pretty women on my visits there

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Old 04-19-2017, 08:55 AM   #182
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^ BTW, Texas is big enough, that 9K might as well be in Montana, geographically speaking.
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Old 04-19-2017, 09:05 AM   #183
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It sure is, I just spent 5 days off roading in West Texas and covered almost 1000 miles.

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Old 04-19-2017, 04:37 PM   #184
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When it comes to water condensation with cooler oil temps you guys are forgetting how and where water is going to be removed from the oil.

Let's start with what we know.

Water and oil don't mix.
Water boils at 100C.
Water vaporizes more readily at higher temperatures and lower pressures.
The oil pan is at less than ambient pressure.
The oil system is under moderate pressure.
​​​​​
​​​​With the engine running the oil in the pan is pretty well mixed up, so we'll disregard water not evaporating due to being covered in oil. That means that while boiling of the water is ideal it can't be the main way for water to vaporize and that leaves evaporation.

There are two main locations that water will have the chance to hit it's vapor point, the oil pan itself, and the ultra low pressure zone on the bearings. In the bearings there is a significant low pressure zone where any water would flash into steam (regardless of pressure) before being forced back into the oil pan, where it's sucked into the engine. In the oil pan the water will just get slowly evaporated out into the engine.

These little oil temperature changes aren't going to cause water to condense in the oil, because in our engines condensed water is ejected very very quickly.
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