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Jun 18, 2014 6:22 am
Jun 18, 2014 6:22 am
Subject: Re: 4.5 litre engine problems and upgrades
Dug out my old heat transfer book from school and ran some numbers with water and with ethylene glycol. For the situation I chose (steel 25mm pipe, 3 m long, flow 20mm/s, pipe at 80 degrees, inlet water at 60 degrees), the ethylene glycol only picked up 60% of the heat that the water did. The output temperature was lower too. Since our prewar engines were designed for water only (going by my 1933 manual), cooling with even standard antifreeze mix might start to be marginal in extreme conditions.
Alec
Dug out my old heat transfer book from school and ran some numbers with water and with ethylene glycol. For the situation I chose (steel 25mm pipe, 3 m long, flow 20mm/s, pipe at 80 degrees, inlet water at 60 degrees), the ethylene glycol only picked up 60% of the heat that the water did. The output temperature was lower too. Since our prewar engines were designed for water only (going by my 1933 manual), cooling with even standard antifreeze mix might start to be marginal in extreme conditions.
Alec