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PostPosted: October 12, 2017, 3:33 pm 
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Joined: July 18, 2009, 9:40 pm
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Location: Frankfort, KY
I've done a leakdown test, but not yet a co2 test. I'll pick up one of those kits. I like to think I shouldn't need another radiator as well, but so far nothing else seems to be working. Maybe the co2 test will reveal an issue that the leakdown test couldn't detect.


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PostPosted: October 12, 2017, 5:12 pm 
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A second radiator will not be required unless you see temps rising noticeably higher then your thermostat or > 240 deg.

50/50 ethylene glycol mix and 15 psi cap will not boil until 265 deg F.

Simply said, your problem is elsewhere.

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PostPosted: October 12, 2017, 5:37 pm 
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Location: Frankfort, KY
rx7locost wrote:
A second radiator will not be required unless you see temps rising noticeably higher then your thermostat or > 240 deg.

50/50 ethylene glycol mix and 15 psi cap will not boil until 265 deg F.

Simply said, your problem is elsewhere.


Going much over 240 with Aluminum heads sounds like a recipe for disaster, and I'd rather not test that. Regarding the mix, I've gone with a lower percentage of antifreeze, a bit of waterwetter, and the rest distilled water. I'd think that once the engine is turned off, the coolant is very likely to reach very high temps while it sits in areas of high temps and is no longer flowing with the waterpump.


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PostPosted: October 12, 2017, 6:56 pm 
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I'm not recommending that running at 240F is OK mind you. Only that the 50/50 antifreeze coolant should not bubble over like you are seeing until over 240F.

Altitude and pressure affect the boiling point of water. At an altitude of ~6,000 ft, water boils at ~200 deg F, not 212F. Just suppose you are a) using 100% water, b) your thermostat is rated to open at 190 degrees and c) your are running no pressure radiator cap as in trying to remove air pockets, then turn off the engine, then I can easily see boil over happening inside the engine and pushing out cooler colant. A 2nd radiator won't fix that.

From my limited experience, I've never had issues like what you are seeing. There is some other problem that a 2nd radiator will not fix.

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PostPosted: October 13, 2017, 8:43 am 
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Could you possibly have the wrong water pump [blades in the wrong direction]. dave w


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PostPosted: October 13, 2017, 10:25 am 
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Water pump is in the right direction. Removed that a long time ago to check, and went ahead and replaced it while it was removed.


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PostPosted: October 13, 2017, 11:00 am 
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Don't recall you mentioning it - what is your timing at idle?

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PostPosted: October 13, 2017, 11:04 am 
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What is your timing at idle vs 2000-2500 rpm?
LOL a.moore beat me to the question

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