Internal Temperature Sensors - Block MM


        Here we are using two LM34 Precision Fahrenheit Temperature sensors to monitor the internal health of the ECM.  These two sensors are placed on either side of the case between the large TO-220 drivers and regulators.  They will be thermally attached to the sides of the case at these points.  We don't expect an excessive amount of heat driving high impedance injectors but it will be a different story with low impedance injectors.  Could very well be in the 15 to 20 watt range at cruise and much higher at elevated RPM.  With these sensor the internal temperatures can be monitored.  Maybe even control a circulating fan near the ECM.  Where my ECM is mounted in the '34 there really isn't any path for fresh air to get into the electronics bay.  With the combined heat of the stereo, compressors and the ECM things might get a little toasty.  I did install a 5" circulating fan but with no real means to monitor the temperature I really don't know how hot things are getting.  Now I will be able to at least monitor the ECM.  And if it is a problem I can easily add an external LM34 somewhere to monitor the general temperature inside the compartment.