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One of my buddies melted down an engine because his radiator got punctured and he ended up losing most of the water. The problem is, water temp looked normal because it was normal before there was no water left.. I want to put a water pressure switch in so that I have an idiot light turn on if I lose all the water. What is the best way of doing this? I was thinking buy a 4 PSI pressure switch (https://www.quickcar.com/4-psi-fuel-...switch-61-730/) , weld npt bung in radiator or thermostat housing, then wire the switch to the idiot light on the Water temp on the gauge cluster. Would this work?
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Why not put a water pressure gauge in the car? -
A: no room for more gauges B: does it really matter what the pressure is? as long as its not 0. lolComment
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An idiot pressure light is very very common almost everyone I know runs one. The way your doing it is fine, I like a little more pressure then 4# but that should workOriginally posted by Burke1118 View PostComment
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Thanks BBCComment
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we use the oil temp dummy light. And it doesn't matter where you put it in the system it will work no need to weld anything special in the radiator. Top of the water pump or the intake works just fine. If you run water lines to the back of the intake most thermostat housing spacer plates have a spot right in the center that works wellComment
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Is there some sort of bypass for a pressure switch upon first startup when the pressure is low that will allow the car to start? Or does the water pressure build that quickly to 4lbs? That's the reason I asked about the gauge was because i was unsure how long it would take to actually crank the car if the pressure build was slow.Comment
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It doesn't hook to the ignition or anything, just a light on the dash. Light is on when no pressure, so it will be on until the cooling system builds to 4# then goes off. If it comes on when racing, you know you have a leak and the water is running out or gone at that point.Originally posted by Punisher88 View PostComment
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Gotcha. I have a low oil pressure switch on my car that will shut it down below like 15. With a bypass button I can mash to make it start initially. When the word switch was used I assumed it meant it would switch the power off below a certain pressure. Not just a warning light.Comment
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Can't say I know of anyone that doesn't have at least a light.Comment
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I use a adjustable fuel pressure switch for my water pressure sensor and it works fine. I have mine in my goose neck housing and I have a big idiot light so it can be seen a mile away lol. Been running this set up for about 12 yrs with no problem I just replace the switch every year so I know it's good. You also want to start your motor and let it get up to temp then set the switch at operating temperature.Last edited by racinrocket1; 05-13-2020, 03:28 PM.Comment
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Longacre sells this setup in a kit for like $25Comment
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After reading this and not knowing these could be bought I purchased kit. Wired to ignition toggle switch and other wired to sensor. Let car warm to over 110 degrees and light still on. Obviously no leaks. How long does it take to build pressure? Let run for 10mins approx.Comment
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old chevy oil pressure sending unit works greatComment
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It varies but you were probably real close to having the light out mine is out before 140 but it can vary with how much room you leave in the radiator for expansionOriginally posted by Jim11h View PostComment
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