Dry Sump / Oil temp sender Options

[Charles Freeborn]

Greetings.
I've got a dry sump system on my car, 6 qt tank, dual front mount coolers.
Currently the temp sender is in the stock location (bottom of engine). Considering it's scavenged and may not have that much oil in it, is this the best location for the temp sending unit? There are a variety of other locations I could put it associated with the dry sump plumbing.
Thx.

[914werke]

good question. Following

[GregAmy]

Your concern about measuring oil temps in a scavenged sump are valid; that's not a good place (you're basically just measuring the temperature of the case). And note that we really can't compare scavanged oil temps to that of a wet sump system, it's just a different animal.

I measure my oil temps in the race car between the cooler and the sump tank*, so that I can know the temp of the oil going back into the engine. You may prefer to monitor it coming out of the engine? Or do both to compare the efficiency of your coolers.

Stangely, I'm having a damned hard time getting the post-cooler oil temps above 198-200, even with a 215 thermostat. Mocal single cooler up front. I'm having to tape up parts of the cooler to get it higher. Yup, I've verified the accuracy of the sensors/data acq config.

GA

*Edit: my system runs from the scavenge pump through a Canton oil filter, then through the thermostat/cooler, then through another Canton oil filter then to the sump tank. My sensor is in that second filter housing (because there's a fitting right there for it). Absent that I'd put the sensor in a bung on the sump tank itself.

[stownsen914]

I've forgotten where the stock sender is, but if it's in the bottom of the case measuring pre-scavenge oil, then I'd agree it's a sub-optimal place to measure temp. It'll be substantially hotter there if you run a front cooler. Anywhere post-cooler would be good.

911s have the sender in the engine, in the pressure circuit, for reference.

[technicalninja]

Personally, I'd want both.

A sensor in sump (or scavenge line) and a sensor in the return after the coolers.

You really only need one long term but having the delta V across the coolers is data I would want during the provisioning and initial 5k miles.

[Bills914-4]

Greetings.
I've got a dry sump system on my car, 6 qt tank, dual front mount coolers.
Currently the temp sender is in the stock location (bottom of engine). Considering it's scavenged and may not have that much oil in it, is this the best location for the temp sending unit? There are a variety of other locations I could put it associated with the dry sump plumbing.
Thx.

I've got mine in the filter bracket , I want to know the oil temp before it goes
into the engine
Bill D.

[Charles Freeborn]

Many thanks for all of your input. I think I'll switch my current single oil temp gauge from the engine sump (stock location) to the cooler return line side. While it may get some additional cooling from the tank and it's associated plumbing, this seems a logical data point to collect. I'll also give serious thought to a second sender and gauge in the stock location to see what sort of spread I get. I suppose I could alternately locate it somewhere in the scavenge plumbing to get a differential reading. Ideally there would be some way to gauge the temp of the cases and rotating parts within, but that's above my engineering paygrade. Time to ponder.

[yeahmag]

I've got mine in the thermostat block on the "return" side to the tank. My thought was knowing that the oil in the tank isn't too hot. I have the ability to run a sensor before the cooler too, which I may do out of curiosity some day.