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Supreme Being
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| | steve after i posted i remembered acid rain something we dont think a lot about here but we do get it every now & then.
 moz. geelong victoria australia. graduate 1980 bus truck car boat submarine buffer |
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Supreme Being
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| Steve,
While straight water/additive may well be the most efficient coolant, the boiling point is pretty low. I have gone to 70% Amsoil propylene, as I am running zero pressure these days (leaky head gaskets). Unlike standard antifreeze, it won't ruin your bearings if it gets into the oil, it has self-sealing properties, and the overflow puddle won't poison my cat. Pricey though.
Anyway, the 70% runs as cool as any other mix I have ever used, so I don't miss the pressure. If it wasn't for my open-air conditions, it would be as close to "permanent" as possible. I read where some diesels run 100% and never have to change/flush in a closed system.
6 VOLTS/POS. GRD. NW INDIANA |
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| | | Supreme Being
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| | Steve, I'm sure the pH levels were concocted based on the use of some form of anti-freeze. I don't run anti-freeze in the F code car, it never goes out when the temp is much below 40. Also race tracks have a dim view of Glycol on their racing surfaces. I had not thought about the relationship of pH to conductivity, somebody will have to explain that to me. This conversation started out based on electrolysis, and wound up discussing erosion from acidic or alkaline based coolant. You may be on to something, but I'm not sure what. Aluminum does not like alkaline contact, but it absolutely hates acidic conditions. Maybe much of what we THINK is electrolysis is actually deterioration from reactions to the coolant. To me it makes no sense to run a pH that alkaline with either cast or aluminum, I'm going to ask some people some questions and see if I can come up with an answer.
Frank/RebopBristol, In ( by Elkhart) 
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| | | Supreme Being
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| There's a company, can't remember the name, that advertises Radiator Caps that have an Anode suspended from them. Would that be beneficial in reducing electrolysis?
Paul |
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| | | Supreme Being
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| | I too am personally beginning to think that the "pH" variance of the coolant - and the incidence of what is called "electrolysis" are one and the same problem. Just as battery acid induces current flow by "stripping electrons" from the battery plates - low pH coolant starts stripping its containment (engine block, radiator, exposed aluminum ....). The tech suggestions to make the solution base (pH 7.0+) just keeps the acid at bay. The suggested upper limitation of pH (10.5) avoids the situation where the alkaline solution starts slipping over the edge toward caustic - which can really get after the aluminum. Using a radiator cap with a sacrificial anode would give you a visual indication that something was up. But erosion of the anode would also indicate that you need to do something - not just change the cap. One tech source suggested use of a digital volt meter to test for "electrolysis" conditions. Suggested: run engine to temp with radiator cap off. With the negative probe on the lowest ground (battery post in most cases) and the positive probe immersed in the hot radiator fluid (not touching anything but fluid), check for DC voltage. If the voltage is as high as .3 vdc - it suggested draining, flushing and refilling with new coolant. Which usually would cause the coolant solution to go to neutral pH (distilled water for instance) or above (to 10.5) for pure antifreeze.
Steve Metzger Tucson, Arizona
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| | | Supreme Being
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| | Frank, forgive me if I drift back to this threads original topic. I just picked up at a tag sale a 1941 machine shop book that has a chapter on foundry work. I didnt know the difference between a cope and a drag before, now I do. Now I have some appreciation of the difficulties involved in foundry work. Now I see making the custom cast cylinder heads and engine blocks that Im always talking about is more involved than ordering a pizza. |
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| | | Supreme Being
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| When I first walked into a foundry in the late 60's and watched them doing core assemblies, I thought, "This is simple, I can master this S*** in a week. Oh really? I still learn something new every time I walk into a foundry, and I have now done foundry engineering and tooling for 40 odd years. Nothin' to it. Mummert got a REAL lesson with the heads, but then i wish I could understand what he knows about airflow.
Frank/RebopBristol, In ( by Elkhart)
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