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Since everything is constantly changing, what is the currently recommended type of antifreeze for a iron block and head '69 with a copper/brass radiator?
I've always used the green stuff in the past.
Or, since I'm in SoCal and don't get into freezing temps, would a anti rust/water pump lube be better? http://www.no-rosion.com/norosioncoolant.htm
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Anti-freeze is also anti-boil. Water boils at 212. Antfreeze boils at ~250. Choice is yours. At 15 psi water will boil at a slightly higher temp but nowhere near that of antifreeze.
Last edited by resdoggie; Oct 23, 2019 at 06:39 PM.
Me too on the green Prestone. However, I can't see paying full price for half strength watered-down stuff. So get the full strength and add distilled water, plus one bottle of Lucas Water Wetter. It really does drop temps some.
Anti-freeze is also anti-boil. Water boils at 212. Antfreeze boils at ~250. Choice is yours. At 15 psi water will boil at a slightly higher temp but nowhere near that of antifreeze.
If that is the case, why do race cars use straight water?? ( I already know the answer ).
Anti-freeze is also anti-boil. Water boils at 212. Antfreeze boils at ~250. Choice is yours. At 15 psi water will boil at a slightly higher temp but nowhere near that of antifreeze.
At sea level, water will boil at ~250F if gauge pressure reads 15psi. It is the absolute pressure that matters (atmospheric plus induced). The formula is Pabs=Patm+Pgauge. In my race car, I run straight water and have seen water temps as high as 250F (radiator was blocked due to debris) and it did not boil. So science plus real world testing says you are wrong.
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Originally Posted by Mordeth
At sea level, water will boil at ~250F if gauge pressure reads 15psi. It is the absolute pressure that matters (atmospheric plus induced). The formula is Pabs=Patm+Pgauge. In my race car, I run straight water and have seen water temps as high as 250F (radiator was blocked due to debris) and it did not boil. So science plus real world testing says you are wrong.
I stand corrected. It's a lot higher as you said under pressure. But antifreeze still boils at a higher temperature than straight water. Plus, it has corrosion inhibitors.
At sea level, water will boil at ~250F if gauge pressure reads 15psi. It is the absolute pressure that matters (atmospheric plus induced). The formula is Pabs=Patm+Pgauge. In my race car, I run straight water and have seen water temps as high as 250F (radiator was blocked due to debris) and it did not boil. So science plus real world testing says you are wrong.
Well, you are assuming the Rad Cap is truly at 15 lb. It could be 12 or could be 18. You also assume your gauge is correct. It could be 240 or could be 260.
Also note that resdoogie said about 250* That's what that symbol in front of his number means.
Lets not get all petty over something that does not matter.
to each his own, but I get rid of Dex in any used car I buy. Got to a Pontiac in the Nick of time. The head gaskets were starting to fail. When I pulled the heads the water passages were partially blocked by this stuff that looked like cork.
to each his own, but I get rid of Dex in any used car I buy. Got to a Pontiac in the Nick of time. The head gaskets were starting to fail. When I pulled the heads the water passages were partially blocked by this stuff that looked like cork.
well that sucks..i bought because it said gm and i just put aluminum radiator in...also replaced heater core but that was leaking before..
should i drain and fill? Leave it.. its pretty fresh..says specifically for my 79 too..
Detailed Description
Coolant/Antifreeze; Prestone(R) Dex-Cool(R) Extended Life Antifreeze/Coolant is recommended and formulated for use in all vehicles that require DEX-COOL(R) coolant, as well as all other cars and light duty trucks with aluminum radiators using extended life coolant. This patented formula has a concentrated blend of premium long-lasting inhibitors for extended performance, protecting against temperature extremes and the ravages of rust and corrosion for 5 years or 150,000 miles.
Antifreeze & Coolant features a patented, advanced organic acid technology that provides guaranteed lifetime protection for as long as you own your vehicle. Patented inhibitors provide maximum protection against damaging rust and corrosion in all automobiles and light trucks worldwide, regardless of make, model, year or original antifreeze color.
Last edited by interpon; Oct 24, 2019 at 05:36 PM.
@SH-60B thanks i think....
so although i think i would be ok with what i put in...i also reread my bottles because ive used a lot of coolant with new radiator, leaks, heater core etc...and guess what i mixed 50/50 and concentrate so no clue what ratio in it...
sooooooooooo.......... a few rounds of walmart distilled water and heater and drain....then off to store for what?
Last edited by interpon; Oct 24, 2019 at 07:27 PM.
Water boils at 212*F at atmospheric pressure! If you pressurize the system, water won't boil until higher temps. More pressure = higher boiling point
Highest temp with glycol and water is a 60/40 mix; but it's easier to remember going with half water and half antifreeze. It's only a few degrees difference.
For most C3 systems, 1 gal 100% ethylene glycol & 1 gal of distilled water. (An empty system takes more, but you can rarely get all out when you drain it.
Last edited by 7T1vette; Oct 24, 2019 at 10:03 PM.
Antifreeze??
