Rubce Posted October 26, 2017 Share Posted October 26, 2017 Hi AllI am considering purchasing an oil temperature gauge for our Stag. My question relates to whether to purchase:-A) an electric type gaugeB) a capillary type gaugeThe second question relates to where is the best position on the engine from which to sense the temperature? The sump?Thoughts pleaseThanksBruce Quote Link to comment Share on other sites More sharing options...
JohnD Posted October 27, 2017 Share Posted October 27, 2017 Bruce,What? Capillary is v.old tech. If the line ever gets damaged it's toast. So electric.Where? IMHO, the sump, 'coz that's where the mass of oil collects.And VDO make a dip stick with a temp sensor on the end. Makes installation a doddle, no need to drill and braze ports on the sumpside.Don't know if it's long enough for a Stag, or if that has a long dipstick!The stick-probe is originally for a VW Beetle.See: http://www.justkampers.com/vdo.....xgAdYyRoCXocQAvD_BwEJohn Quote Link to comment Share on other sites More sharing options...
Rubce Posted October 28, 2017 Author Share Posted October 28, 2017 Hi JohnThanks for the reply. It has given me food for thought Regards Bruce Quote Link to comment Share on other sites More sharing options...
RobPearce Posted October 30, 2017 Share Posted October 30, 2017 I disagree with John on the location. The oil sits in the sump and does slosh around a bit but it's not well mixed. You may get very misleading readings (my brother certainly did on his Spitfire). It's better to measure the temperature of the working oil, somewhere in one of the galleries. Quote Link to comment Share on other sites More sharing options...
Tim Bancroft Posted October 30, 2017 Share Posted October 30, 2017 Howabout, if the car has an oil cooler, fit in the line from the oil filter housing to the oil radiator, before the oil thermostat. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted October 30, 2017 Share Posted October 30, 2017 I've seen the sensor fitted on the supply side of the oil-stat.Planning to put mine either in the big gallery plug just after the oil pump or drill and tap the spin-on adaptor as I want to measure the actual circulating temperature. Judging by the way the oil colour changed in just one day on the 10CR........ it's getting proper hot.Nick Quote Link to comment Share on other sites More sharing options...
JohnD Posted October 30, 2017 Share Posted October 30, 2017 Quoted from RobPearce I disagree with John on the location. The oil sits in the sump and does slosh around a bit but it's not well mixed. You may get very misleading readings (my brother certainly did on his Spitfire). It's better to measure the temperature of the working oil, somewhere in one of the galleries. Each to their own, but "not well mixed"?Why do we fit oil baffles?How much oil does the pump flow? That last is a good Q! I don't know the answer, but I do k ow a man who is going to answer, soon, as he's setting up a measurement rig. And very similar gerotor pumps do tens of gallons an hour!Job Quote Link to comment Share on other sites More sharing options...
JohnD Posted October 30, 2017 Share Posted October 30, 2017 Quoted from JohnD And very similar gerotor pumps do tens of gallons an hour!Job Oos! Tens of litres per minute!John Quote Link to comment Share on other sites More sharing options...
RobPearce Posted October 31, 2017 Share Posted October 31, 2017 Quoted from Spitfire6 Where are the car manufacturers fitting the temperature sensors? Typically in the block or head, sensing the temperature of the working oil in the gallery. Quote Link to comment Share on other sites More sharing options...
JohnD Posted October 31, 2017 Share Posted October 31, 2017 Audi - oil pump housing"Bob is the oil Guy" - oil panGrumpy's - oil filterMitsubishi - oil pan (sump) or filter housePorsche - oil filterCorvette - oil filterThe filter seems to be the consensus. But that demands a lot of work. Would the oil that the filter/pump flows be 'well-mixed'? Fitting it in the oil gallery? If you can find a sensor that will substitute for an Allen bolt.I suggested the dipstick sensor because it's so easy.What problems did your brother have, Bob?JohnJohn Quote Link to comment Share on other sites More sharing options...
RobPearce Posted October 31, 2017 Share Posted October 31, 2017 Don't call me Bob.My brother's sensor-in-the-sump would read fully cold (30 degrees or less) oil temperature on a motorway run. Granted his fitment was probably worse than the dipstick trick - using the drain plug hole as a convenient access point - but the basic issue is the same.I'm surprised by the Mitsubishi. Most production cars that have oil temperature sensors are using them for a reason, such as correcting the valve drive duty for VVT control valves, and need to know the temperature of the working oil. The filter housing is a convenient good-enough location for an update to an existing engine, but I'm fairly sure the BMW ones are engineered into the head, so that they're measuring the real temperature applicable to those VANOS valves. Quote Link to comment Share on other sites More sharing options...
JohnD Posted October 31, 2017 Share Posted October 31, 2017 Apologies, Rob, unintended.I can tell you that my dipstick sensor does not read low, however fast I drive!John Quote Link to comment Share on other sites More sharing options...
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