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best place to locate oil temp sending unit...

692 Views 2 Replies 3 Participants Last post by  Poster Child
where would be the best place for me to install an oil temp sensor / sending unit on a small block with an oversize oil pan, external oil cooler / heat exchanger and oil filter?

I'm using a combination oil / transmission cooler and the external oil filter set-up that were made for a big block.

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you are gonna get 2 answers, either before or after the cooler. I like having it before the cooler, so I can see what temp the oil is coming out of the engine at. Most remote oil filter mounts have a place to locate the sender for the cooler.
Do a search and there will be loads of info including correspondence from a bearing manufacturer.
The best place to measure oil temp is right before the bearing. I have discussed this with several rotating engineers and process engineers. Every industrial design I've seen measures oil temp after the cooler going to piece of equipment.

We here on this board have had this debate extensively several times. I have always tried to explain why it is important to know the oil temp to the bearing. With that said, I'd like to draw some attention to today's oil.

These days MOST everyone uses a multi vis oil. Those of us still using the straight weights may not be able to much longer. It's rumored they won't be packaged anymore.
Anyway, it has been written on this board, "why would I want to know the oil temp after it's been cooled?"
Other than reasons I've already explained the multi vis numbers mean the oil changes flow capabilities with temperature.
Example: I use a 15W40. The W means WINTER, not weight. So that means when the oil is cold it flows like a straight weight 15 would at the same temp.
The 40 means the oil flows like a straight weight 40 would at 212*
So in theory if your measuring your oil in the sump, WHICH IS OK, just NOT IDEAL and your sump temps are 225* but your cooler is cooling it to 100* (not likely, just example) you're not getting the full protection of your oil that you think you are.

Absolute minimum temp should be 180* in my opinion. Dennis Moore says 220* is ideal. I would feel fine at 212*. The additional purpose of these temps is to remove entrained water from the oil. That way it wont look like milk.

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