Cylinder Head Temp

[gqneon]

What's the highest you've seen your cylinder head temperature display read and what we're you doing when it read that?

I'm very curious, because I normally run about 195-205 give our take, and heat soaked I've seen it go 226-228 before. Yesterday I hit 237, but was in stop and go traffic in 101 degrees with the AC on. Once I got on a roll again, I put some air through the radiator from a roll with the gas pedal released, and it took a bit to get it to start coming back down. I almost wondered of the thermostat might have closed for some reason, shortly after that or went back to 205 like normal.

Fluids are all good, oil temp scaled up with if, temp display on dash didn't move from left of center. Not sure if I should be alarmed or not.

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[jrt6]

Highest I've seen is probably around 208-210F in Houston heat (95-100F) and stop and go traffic.

 

[emh87]

I'm not sure what mine was at exactly earlier today, but I think it was at least 220. I was idling for a while after some heavy driving with the AC on. When I went to open my hood I could not hold onto the hood prop it was so hot. Time to get the hood struts.

 

[gqneon]

I almost wondered if the thermostat somehow closed up part way or something. It's never gone nearly that high before and it seemed to climb fairly quickly. A little concerning.

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[madweazl]

205-210° typically. Highest I've seen was 211° thus far. Ambient temps range from 75-95°.

 

[DivineStrike]

Close to 220...with normal driving no higher than 210.

 

[Wblv17]

normal 207 to 212, i did see 237 before. no worries

 

[15Pony]

What is the difference between coolant temp and cylinder head temp? The head has coolant running through its holes. Where is the cylinder head temp sensor - does it stick into the coolant flow within the head? Or is the temp being measured at the valves or elsewhere?

 

[dfrost]

215-220 sitting in 100 ambient Florida. Goes down to 190-205 pretty fast once moving.

 

[gqneon]

Thanks to all - especially Wblv17 about the reassurance of 237. It's only happened once, and since my car is ProCharged I know the intercooler blocks a good portion of the radiator, especially when stopped. I think it was just heat soak - the coolant normally runs about 10 degrees cooler than the head temp measurement, I think that sensor is literally just tapped into the aluminum head but I don't think it hits coolant per se.

I didn't have my datalogger plugged in so I don't know that actual coolant temp readout but what bugged me was that the needle seemed to be left of center towards the cool side. This is about where it sits normally. Then again, I don't think that gauge is really worth a damn from the factory, it's normal range is 140-280, so I think what it displays is fairly inaccurate since it doesn't move at all really when I'm datalogging and wathcing spreads of 20 degrees.

I think it was heat soak. I'm running about a 70 / 30 water to coolant mix with Purple Ice in there, before the ProCharger install I could get up to about 80 in 6th, let me foot off the gas and coast down letting air force the temps down and get my head temp down to 187-189 by the time I got to 40-50mph or so. Fantastic stock cooling.

With the blower and extra heat and intercooler obstruction of the radiator, I do the same thing I can get into the low 190's. Still terrific, and cruising when it's 85-95 out I stay at about 197-205 ish still. Load, stop and go, etc, up to 226 or so. That's why the sudden 10 degree spike caught me off guard.

 

[Barrel]

I saw 239 once but that was a complete stop in traffic after crawling for 15 minutes. It went down to 208-210 once we were moving again.

 

[Grim_Reaper]

The other day while taking a nice cruise on some back mountain roads mine climbed from 205-212 (normal range for me in Vegas 95+ temps) all the way up to 236. It was a little concerning because I was cruising at about 65-70mph and not on the throttle hard at all. I was going uphill at the time but never seen it do that before on similar roads/conditions.

 

[gqneon]

Interesting

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[Nazgul]

Freeway cruising gets me the highest Temps. My car regularly registers 210-220 cruising at 80mph at 80*f. From. My understanding anything greater than 260+ is iffy for the aluminum heads. I think the biggest concern is where the head meets the block. With them both being aluminum you get consistent heat transfer. If the block was iron I bet there would be more head gasket leaks with the coyote.

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