andy couchman Posted November 13, 2015 Share Posted November 13, 2015 What's the current thinking on thermostats?Currently have a 74 degree unit and have drilled one hole in it to allow water to get threough if the thermostat fails.Any better/different ideas? And would you replace the thermostat when doing a head rebuild as a safety precaution?Thanks.Andy Link to comment Share on other sites More sharing options...
OliverSedlacek Posted November 13, 2015 Share Posted November 13, 2015 74 degrees is much too low! I would certainly replace a thermostat routinely as they are pretty cheap and I'm putting an 88 degree thermostat in at the moment. I've never bothered with drilling a hole, but then I've always run a heater. Link to comment Share on other sites More sharing options...
SM25T Posted November 13, 2015 Share Posted November 13, 2015 Hole not going to provide enough water flow if thermostat fails. It is intended to let air bubbles pass through ... if positioned at the top when fitted. Link to comment Share on other sites More sharing options...
Roger King Posted November 13, 2015 Share Posted November 13, 2015 74 degrees is correct. The engine ideally needs to run at around 80 degrees and this is about what you get in the real world with the 74 degree unit. And yes, drill a small hole.I wouldn't routinely replace it when the head is rebuilt unless it is known to be very old or failing. It can't do any harm though. Link to comment Share on other sites More sharing options...
Drumster Posted November 13, 2015 Share Posted November 13, 2015 Hi Andy,Always ran my x/flow with the 74 degree thermostat (that's probably because Roiger told me to do so ) Link to comment Share on other sites More sharing options...
andy couchman Posted November 17, 2015 Author Share Posted November 17, 2015 Excellent - thanks Roger et al.Andy Link to comment Share on other sites More sharing options...
OliverSedlacek Posted November 17, 2015 Share Posted November 17, 2015 A hole in the thermostat is useful when filling the engine. Without it there's no way out for the air in the block (unless you crack open the heater circuit or equivalent). Link to comment Share on other sites More sharing options...
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