petawawarace Posted December 3, 2020 Report Share Posted December 3, 2020 Is a 4psi coolant pressure switch too low? It will be located before the water pump but the entire system should be roughly the same pressure correct? Quote Link to comment Share on other sites More sharing options...
mender Posted December 3, 2020 Report Share Posted December 3, 2020 The pressure will be slightly lower right before the water pump but I don't think it'll be an issue. 4 psi should be fine, mine is at 3 psi and came on as soon as one of my rad hoses blew off. 1 Quote Link to comment Share on other sites More sharing options...
turbogrill Posted December 3, 2020 Report Share Posted December 3, 2020 (edited) How come factory engines don't have this? Seems more important than oil temp. Only time I ruined an engine was when a coolant hose got loose and it lost pressure. Engine destruction was very quick. Edited December 3, 2020 by turbogrill Quote Link to comment Share on other sites More sharing options...
petawawarace Posted December 3, 2020 Author Report Share Posted December 3, 2020 8 minutes ago, turbogrill said: How come factory engines don't have this? Seems more important than oil temp. Only time I ruined an engine was when a coolant hose got loose and it lost pressure. Engine destruction was very quick. Likely because in a street driven vehicle if you lose coolant it will slowly overheat. In a racecar, it’s going to happen very quick. 21 minutes ago, mender said: The pressure will be slightly lower right before the water pump but I don't think it'll be an issue. 4 psi should be fine, mine is at 3 psi and came on as soon as one of my rad hoses blew off. Thanks. Does the light come on when the engine is cold then? Quote Link to comment Share on other sites More sharing options...
mender Posted December 3, 2020 Report Share Posted December 3, 2020 (edited) Yes, that way I know it's working. I have it hooked up to a shift light through a relay and as the engine warms up it goes from solid red to flicking to off. Go to 6:55: Note: no defroster or heater, just anti-fog on the inside of the windshield. Edited December 3, 2020 by mender 1 Quote Link to comment Share on other sites More sharing options...
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