What temp is too hot for these engines? - Defender Source
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  #1  
Old August 20th, 2011, 12:40 PM
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What temp is too hot for these engines?

I've been running up to 210 at idle with the A/C (82 degrees outside temp) on, is this too hot? If not at what temp should I start to worry?

Thanks, VB
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  #2  
Old August 20th, 2011, 02:29 PM
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Lots of opinions on this, but 225 is when I worry.
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  #3  
Old August 20th, 2011, 07:18 PM
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When i get to 190 i start paying attention
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  #4  
Old August 20th, 2011, 08:13 PM
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What engine are we talking about?
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  #5  
Old August 20th, 2011, 08:54 PM
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Sorry, the 4.0

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Originally Posted by defeyago View Post
What engine are we talking about?
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  #6  
Old August 20th, 2011, 11:17 PM
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It's a bit warmer than usual, but not into the worry zone just yet. Wouldn't hurt to get it running cooler, but not hot enough that I'd be concerned.

It's around the 230 mark that people really start worrying, as that's when you start getting concerned about the sleeves slipping.

-Hans
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  #7  
Old August 22nd, 2011, 11:12 AM
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Climbing this one stretch I go from an elevation of about 500-4,000 in less than 15 mins and my temps climb pretty fast too. This si a 4.0 with 100k and other than that it always runs at normal temps with/without the AC on. Once I'm at the top it cools down just fine and within a couple miles I'm back at operating temps again. Think running excessively hot for 10-15 mins is enough to cause perm damage?
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  #8  
Old August 22nd, 2011, 11:21 AM
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If you go over the 220 threshold from what I have read is when you might want to pucker. Aluminum engines do not like getting overly hot.
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  #9  
Old August 22nd, 2011, 12:11 PM
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I build a cooling system to stabilize at 190 in the conditions you describe. Anything else is just rolling the dice waiting for an overheating event.

If you are spending your time staring at the temperature guage while you are adjusting the throttle then it is all a waste of time. IMO
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  #10  
Old August 22nd, 2011, 05:20 PM
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My understanding is conventional wisdom is modern engines (including the LR 3.9 and 4.0) operate most efficiently at 210 deg. F. So most cars recently built are designed to operate there with 210 deg thermostats.
This seems a bit warm but my 3.9 runs around town and highway at 190 and can get as high as 200ish climbing steep hills at 7000 ft elevation on really warm (95+) days. Cools back to 190 after. I don't think this is bad but I may be wrong
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  #11  
Old August 22nd, 2011, 06:33 PM
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At the risk of sounding like a noob, on my '94 gauge, with no actual numbers, what are the numeric equivalents to 1/2, 2/3, 3/4, etc?

I tried searching, but it looks like I need a Josh level of search acumen to find.
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  #12  
Old August 22nd, 2011, 08:53 PM
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It is not very accurate. I changed out my temp gauge on the 94. The old only read in the middle and just short of overheat it will move into the red.
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  #13  
Old August 22nd, 2011, 09:45 PM
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A tick under middle is the sweet spot. Thats about 190. I think 3/4 is about 220-225. I'm not in my truck to see though. Also I would check your grounds to the engine. The Defender isn't grounded as well like the RRC or Disco is. And that can effect the reading. I recently put some better grounding wires in and helped with the "why did the temp jump a smidge when I turned my lights on" and "I hit that huge pothole and my temp jumped?"

Plus a new 5 core radiator helps too
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  #14  
Old August 22nd, 2011, 10:51 PM
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I would advocate a VDO gauge, my stock gauge would go just shy of the red and engine temp was 200. Just right of center was 180. VDO gauge installed, piece of mind.
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Old August 23rd, 2011, 01:27 PM
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Quote:
Originally Posted by ini88 View Post
A tick under middle is the sweet spot. Thats about 190. I think 3/4 is about 220-225. I'm not in my truck to see though. Also I would check your grounds to the engine. The Defender isn't grounded as well like the RRC or Disco is. And that can effect the reading. I recently put some better grounding wires in and helped with the "why did the temp jump a smidge when I turned my lights on" and "I hit that huge pothole and my temp jumped?"

Plus a new 5 core radiator helps too
For the life of me, I cant find the post on "Why did the Temp Jump...." Someone have a link?
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  #16  
Old August 23rd, 2011, 02:49 PM
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Quote:
Originally Posted by 97-D90-736 View Post
For the life of me, I cant find the post on "Why did the Temp Jump...." Someone have a link?
haha, oh that was my just paraphrasing things I've heard over the years. I don't think there is an actual thread on it.
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