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www.RX7fb.com • View topic - Oil temp sensor

Oil temp sensor

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Re: Oil temp sensor

Postby Hobbawobba » Thu Jun 15, 2017 11:13 am

Hmm, I'll have to keep an eye on my temps when I get back on the road. Maybe make some ducting or relocate it

I assume you're getting decent airflow?
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Re: Oil temp sensor

Postby TOOL » Fri Jun 16, 2017 7:48 am

Whats the water temp doing?
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Re: Oil temp sensor

Postby MelloYello » Fri Jun 16, 2017 9:23 am

The high oil temperature readings i am getting are around 100C degrees and above.

Last night I remove the thermostat located in the cooler which blocks the bypass when up to 65C degrees. I then blocked it with a bolt washer and lock nut.

Big improvement. The oil temperature increase from cold is now much more gradual and seems to be holding around 90C when I am moving and have good air flow.

I still plan to do a trial swap with a cooler that has a proven history, as I believe the cooler may have blockages. Especially if it has not had good flow all this time.
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Re: Oil temp sensor

Postby kenwhiteside » Fri Jun 16, 2017 5:38 pm

90-100degs is perfect for oil temp. I would not want it any cooler! Jacking the stat in the oil cooler is making warm up slower, this is not really a good thing...

Remember with the beehive cooler your oil temp will be pegged to coolant temperature at a minimum, this is pretty standard in most vehicles these days. Unless you are operating above 130deg I would not worry, this is really only an issue as you will see a drop in oil pressure. Oil temp limit is probably 140ish.
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Re: Oil temp sensor

Postby KiwiDave » Sat Jun 17, 2017 1:52 am

Racing Beat say that oil temperature entering the engine should never be allowed to exceed 205°F. (95°C.)

Obviously, once the oil enters the motor, it will absorb heat then circulate back thru the oil cooler then thru the filter.

So, if your oil temp sensor is on a plate under the filter and you are still seeing temps in excess of the above, the cooler is not doing the job properly.
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Re: Oil temp sensor

Postby KYPREO » Sat Jun 17, 2017 11:10 pm

kenwhiteside wrote:90-100degs is perfect for oil temp. I would not want it any cooler! Jacking the stat in the oil cooler is making warm up slower, this is not really a good thing...

Remember with the beehive cooler your oil temp will be pegged to coolant temperature at a minimum, this is pretty standard in most vehicles these days. Unless you are operating above 130deg I would not worry, this is really only an issue as you will see a drop in oil pressure. Oil temp limit is probably 140ish.


To me this perfectly describes why Mazda toyed with a water-oil cooler for 2 years only (but notably not on its 13B GSLSE and 12A turbo models) and promptly threw it in the bin and never used it again.

These water oil coolers ran on the edge for street driven 115hp engines. Anything more demanding and you're pushing 100C, which will kill a rotary engine. The reference to most modern vehicles isn't applicable as, unlike piston engines, rotary engines use oil for cooling.

I would defer to the Racing Beat advice KiwiDave posted
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Re: Oil temp sensor

Postby KiwiDave » Sun Jun 18, 2017 2:56 am

MelloYello wrote:The high oil temperature readings i am getting are around 100C degrees and above.

Last night I remove the thermostat located in the cooler which blocks the bypass when up to 65C degrees. I then blocked it with a bolt washer and lock nut.

Big improvement. The oil temperature increase from cold is now much more gradual and seems to be holding around 90C when I am moving and have good air flow.

I still plan to do a trial swap with a cooler that has a proven history, as I believe the cooler may have blockages. Especially if it has not had good flow all this time.


Have you considered an oil cooler fan? https://www.thinkauto.com/acatalog/On_l ... ts_16.html
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