Author Topic: Engine Operating Temperature????  (Read 976 times)

Offline Oldschool

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Engine Operating Temperature????
« on: July 27, 2016 - 09:14:55 AM »
With an iron block and aluminum heads, how high can the engine coolant temperature rise before it will damage the engine? Using 20w-50 racing oil. I have heard that 205* would be the upper limit, and I have heard that 230* won't hurt it for short drives of 10-15 minutes. What is the opinion of the board?  :dunno:
« Last Edit: July 27, 2016 - 09:18:43 AM by Oldschool »
Ken  --  In Georgia

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Offline BIGSHCLUNK

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Re: Engine Operating Temperature????
« Reply #1 on: July 27, 2016 - 09:40:43 AM »
Geeeez Ken , personally I think 230 is up on the scary end...  :dunno:   But some of our motor guru's will chine in here I'm sure...
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Offline CUDA JAS

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Re: Engine Operating Temperature????
« Reply #2 on: July 27, 2016 - 10:39:52 AM »
Geeeez Ken , personally I think 230 is up on the scary end...  :dunno:   But some of our motor guru's will chine in here I'm sure...

My 360 runs 220 all the time without any issues.  I can never seem to get it to stay under that.

Jason
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Offline 67vertman

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Re: Engine Operating Temperature????
« Reply #3 on: July 27, 2016 - 03:46:28 PM »
My 440 with an iron block and aluminum heads runs 195*  I wouldn't want to push it past 220* though, for very long.  I can ask my engine builder what he thinks.  With the cooling difference between the metals I would be afraid of pushing out a head gasket or warping a head.



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Offline MEK-Dangerfield

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Re: Engine Operating Temperature????
« Reply #4 on: July 27, 2016 - 05:11:47 PM »
I'm of no help, as usual, but I want to share a story about back in the day before I became a car guy....

I had an 86 Pontiac that I bought used. I was going to a golf outing to meet up with some guys from work. It's REALLY hot that afternoon, and I'm stuck in traffic. So I notice the temp. gauge going to where it has never gone before. So I turn off the AC, and wind down the windows. That didn't help me or the engine get cooler.   :grinno:  So I'm a couple of miles from the golf course, and the needle is pegged at 260* on my dash. I pull over and open the hood, and see my overflow bottle is boiling. I give it 10 minutes, it's still boiling. Well, I'm now going to be late if I don't start this piece of hot lava of an engine up soon.  So, do I care about the engine? No. I start it up, and every time I give it gas, it pings it's arse off. I get to the golf course and figured it had a few hours to cool off. Luckily, I had a couple of gallons of water in my trunk, so I refilled the radiator and made the 30 mile drive home just fine. It turns out, my radiator had hardening of the arteries because coolant flow was greatly restricted by corrosion. I sold the car years later with 147,000 miles on it, and the engine still ran like a champ, despite my stress test.   :eek7:

Mike

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