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Old 11-29-2017, 11:04 AM   #11 (permalink)
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I ran 75% antifreeze mix in my suburban once, took me a while to figure out why it was running hot. Once I dumped out some of the antifreeze and replaced it with water it was back to normal.

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Old 11-29-2017, 02:18 PM   #12 (permalink)
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Was that a nice and hot or a too hot scenario.
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Old 11-29-2017, 04:12 PM   #13 (permalink)
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Hitting 230F on a warm day not towing anything is bad.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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Old 11-29-2017, 05:13 PM   #14 (permalink)
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Old 11-29-2017, 05:50 PM   #15 (permalink)
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Quote:
Originally Posted by Daox View Post
Added to the list! Those are good. Like any modification you must be aware of its consequences and thus check your oil more regularly.
I don't think that you will reduce your warm up time much, if any, by using a higher concentration of antifreeze, but you WILL reduce heat transfer quite significantly, meaning that the cooling fan will have to run more and you will have to have larger cooling openings. Detonation will also be more likely with reduced heat transfer because hot spots can develop. Glycol is also much thicker than water, so your water pump will take a lot more energy to spin, further offsetting any gains from faster warmup. If your goal is to reduce heat transfer, why not use 100% Propylene glycol antifreeze, aka Prestone Lowtox or something like it? Straight PG won't freeze unlike EG and doesn't transfer heat as well as EG based coolant.
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Old 11-29-2017, 05:52 PM   #16 (permalink)
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Quote:
Originally Posted by Daox View Post

10) Concentrate the coolant to approx. 75% glycol
I don't think that you will reduce your warm up time much, if at all, by using a higher concentration of antifreeze, but you WILL reduce heat transfer quite significantly, meaning that the cooling fan will have to run more and you will have to have larger cooling openings. Detonation will also be more likely with reduced heat transfer because hot spots can develop. Glycol is also much thicker than water, so your water pump will take a lot more energy to spin, further offsetting any gains from faster warmup. If your goal is to reduce heat transfer, why not use 100% Propylene glycol antifreeze, aka Prestone Lowtox or something like it? Straight PG won't freeze unlike EG and doesn't transfer heat as well as EG based coolant.
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Old 11-29-2017, 06:24 PM   #17 (permalink)
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Just for the record: I had my glycol at 75%, full grill block, and my engine covered in bubble wrap, and it never over heated.

I guess YMMV.
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Old 12-03-2017, 01:58 PM   #18 (permalink)
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Automotive antifreeze viscosity table and viscosity chart

Dot know if this si for EG or PG

If you want to run strate then run E
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Old 12-03-2017, 02:56 PM   #19 (permalink)
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Straight antifreeze will freeze at -15c? Interesting.

I wonder how much higher the boiling point is when considering the additional pressure in the system (regulated by the rad cap)...like the difference between boiling water at sea level and at 8000ft.
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Old 12-03-2017, 08:57 PM   #20 (permalink)
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Where I am at 4400ft the boiling point is 208F.

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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white 240v evse mod, trailer hitch, new batt as of 2014.
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