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Originally Posted by 5150 Respectfully, I would disagree.... put the temp sender in a position after the cooler just before it enters the oil supply galleries. This way you will know the temp going to the main bearings. ( very important ) It is inconsequential what the temp is in the sump or remote reservoir. Also some type of thermostat and cooler by-pass should be used to keep oil temps between 200 - 230 deg F. Never lug the motor with cold oil !  |
Scott, I agree with you.... But only for your last sentence
As you say, the best way is to use a thermostatic 4 ways valve to have a constant working oil temperature. Oil radiator as well the oil sump volume should be sized to keep the oil temperature at a constant value what ever the external weather and the road (or race) traffic. It means that if you install the oil temperature sender at the engine oil input, you will record only a constant value (the regulated oil radiator ouput temperature value). For my view point, it is preferable to read the oil bearing output temperature value. Only this temperature will reflect the engine load. To reinforce my argument I would like to show to you some pictures of my last oil temperature problem.
Picture one: oil (and water) temperature are very high (normal is not above 260°F)
Picture 2: After investigation the rod bearing number 8 was at the begining to be destroyed (to be compared with an other rod bearing)
Picture 3: here is the oil sender location on the return oil filter (at this point, oil is back from the bearings to the tank).
To conclude, I understand that it could be easy to fix the oil temperature sender on the remote oil filter that is located on the input circuit but it is preferable to weld a socket on the sump or if you use a dry sump to connect it on the oil return line. In a similar way, the water temperature sender is connected at the water output going to the radiator.
Is is my only 2 cents comment in this friendly forum