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Feb 16, 2013 8:30 pm
Feb 16, 2013 8:30 pm
Subject: Coolants
Having suffered extensive (and expensive) cracks on head and block of the two 2 Litres I have owned, I've been wondering whether local hotspots due to vapour blanketing may be an issue. I think we mostly use ethylene glycol (EG)/water mixes with (we are urged) inorganic additives. But it would seem that 100% propylene glycol (PG) coolants (Evans?) should have advantages, particularly in their high boiling point which should eliminate vapour hot spots. However PG has little more than half the thermal capacity of water so coolant temperatures should be higher which doesn't sound good given that my 14/60 already likes to boil if shown a hill on a hot day. And that's after re-coring the radiator. Has anyone any views on or experience of these PG coolants? Also, I read that France has banned EG in view of its lethality to animals so what is used over there?
John
Having suffered extensive (and expensive) cracks on head and block of the two 2 Litres I have owned, I've been wondering whether local hotspots due to vapour blanketing may be an issue. I think we mostly use ethylene glycol (EG)/water mixes with (we are urged) inorganic additives. But it would seem that 100% propylene glycol (PG) coolants (Evans?) should have advantages, particularly in their high boiling point which should eliminate vapour hot spots. However PG has little more than half the thermal capacity of water so coolant temperatures should be higher which doesn't sound good given that my 14/60 already likes to boil if shown a hill on a hot day. And that's after re-coring the radiator. Has anyone any views on or experience of these PG coolants? Also, I read that France has banned EG in view of its lethality to animals so what is used over there?
John