Do you trust sunpro guage & what is overheating?

[gotta240]

Few questions regarding coolant system, etc.

1. Do any of you guys use the old style(ones with big sender unit, for domestics) temp guages? If so, how do you use them on the 240. I just made an adapter for the upper rad hose from pipe, and welded a larger bung onto it. Has anyone done a similar set-up?

2. Is it wise to trust a sunpro manual guage? Mine reads 140f during normal driving. Clutch fan, stock thermo and rad, water wetter... Doesn't that seem low?

3. At what temperature is your car TOO HOT? Meaning, when at the track, at what temperature do you shut your car off at?

thanks guys

[trybal]

thats way to low... temp wise..

[sr20boostn20]

im terrible with farenheit, but daily driving my car uasually runs at about 87-91 deg celsius, koyo rad, flex-a-lite 220 fans, nismo colder thermostat

[ch1873857]

im terrible with farenheit, but daily driving my car uasually runs at about 87-91 deg celsius, koyo rad, flex-a-lite 220 fans, nismo colder thermostat

thats almost 200 degrees, thats pretty warm

[gotta240]

So at what temp do you guys pull off the track to let things cool down?

[ch1873857]

just think 256 is boiling. i dont think you would want to get THAT close to that.

[UNITEDMASTER]

Hello I would say 200-210 its time to chill out (literally).Anything more is DANGER ZONE!!!

[twofortyrida1388]

Wow my pos jeep(used to have) ran at 230 for months. Had 240k and I still got a kick bouncing it off rev limit at like 5400 or some shit like that.(damn I hated that thing).

[johngriff]

Measuring from where with what type of thermo coupling?

On stock SR's with mechanical style thermo couplings hooked up to the outlet water flow you will see 230ish temps.

The SR takes its temp from after the block and before the head, where that coolant gets super hot.

I would like to hear about different temp readings taken at different places in the cooling system. What is the core temp of the aluminum, metal on metal contact. How hot does the metal itself need to get to soak the combustion chamber into pre detonation? Which side is it better to run hot on.

Should you cut holes in the head gasket to accomodate for the added cooling flow? OR will you just be taking that scalding hot water and moving it over the intake air charge?

[twofortyrida1388]

!!^^^^^!! After that I'm in the background readin and learnin.:tweak: Please continue :aw:

[gotta240]

My temp guage is stuck in a custom made adapter (piece of 1 1/2" pipe, with a threaded bung welded to it) directly between the thermostat and the radiator.

The car usually runs at 140 F. and gets to 160/170 at times. I'm starting to wonder if i have a thermostat, as these temps appear to be LOW.

[johngriff]

You are just metering the water comming out of the radiator.

[240trainee]

Measuring from where with what type of thermo coupling?

On stock SR's with mechanical style thermo couplings hooked up to the outlet water flow you will see 230ish temps.

The SR takes its temp from after the block and before the head, where that coolant gets super hot.

I would like to hear about different temp readings taken at different places in the cooling system. What is the core temp of the aluminum, metal on metal contact. How hot does the metal itself need to get to soak the combustion chamber into pre detonation? Which side is it better to run hot on.

Should you cut holes in the head gasket to accomodate for the added cooling flow? OR will you just be taking that scalding hot water and moving it over the intake air charge?


Yea, thats what I'm curious about, if you put your sensor at various parts of the engine there are going to be different readings.

I'm thinking that the lower rad hose would be best, because theoreticlly those should be the hottest temps.

but I dunno, I'm dumb about that.

[gotta240]

Dumb question, but does the water flow from the thermostat TO the radiator, of from the radiator TO the thermostat?

[fliprayzin240sx]

Radiator, lower hose to thermostat. If its not open, the water is circulated thru the engine by the waterpump. When the thermostat opens, coolant flows into the block and the excess/hot coolant flows out of the upper rad hose.

[gotta240]

thats what i thought. Therefore i'm getting the hottest temp possible from a radiator hose....

[johngriff]

no the coldest. heat rises, so the feed is always from the bottom.

[ch1873857]

some of the fully "built" cars ive seen had multiple temp gauges. upper, lower, and cylinder head temp. pretty crazy. so are you confirming that the best place for the sensor is in the lower hose? because if your coldest temps in the system are over temp. then you have you cooler coolant to replace it so its just going to get hotter? is that what im getting out of this?

[fliprayzin240sx]

Upper hose will read the actual water temp in the engine. Lower hose will measure the cool temp after the rad. All the bottom will do is show that your radiator is working. The upper will show that your shiet is actually overheating. Lower hose will always show a lower temp than whats the actual temp of the engine. That difference could be the difference between warping an aluminum SR head or not.

[smelly240]

sunpro is made by snap-on.. i trust it.

[gotta240]

1st- Thanks a lot for the replies. So "turn off" temp should be around 210 then?


2nd- Johngriff- you are saying the COMPLETE OPPOSITE of what fliprayzin240 is saying.....

[johngriff]

sorry, if there was some kind of confusion, i wrote that with one finger in bed last night.

The lower hose of the radiator is always the exit water, that way the coldest water at the bottom flows into the engine. If you place a thermo coupling inline here, you will just get a cold reading.

Between the thermostat and the head is the standard "area" that most OEM's seem to place their gauges. This is the common place to take a reading.

On the exit of the head, you will see the hottest temps, with that coolant passing over the combustion chamber. This exit hose attaches to the top of the radiator.

[fliprayzin240sx]

sorry, if there was some kind of confusion, i wrote that with one finger in bed last night.

The lower hose of the radiator is always the exit water, that way the coldest water at the bottom flows into the engine. If you place a thermo coupling inline here, you will just get a cold reading.

Between the thermostat and the head is the standard "area" that most OEM's seem to place their gauges. This is the common place to take a reading.

On the exit of the head, you will see the hottest temps, with that coolant passing over the combustion chamber. This exit hose attaches to the top of the radiator.


Were saying the same thing, just different versions...:bigok: