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grahamsingleton(at)btinte
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 Posted: Wed Jun 09, 2010 1:21 pm Post subject: Cooling issues, once again! |
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Well done Frans!
I don't think much heat goes through the fins on the cylinder anyway. All the heat is generated in the cylinder head and goes through the head into the coolant and through the piston to heat the oil. Probably better to let the bores warm up to match the piston temperature anyway. More constant clearances, imho of course.
Graham
From: Frans Veldman <frans(at)privatepilots.nl>
To: europa-list(at)matronics.com
Can't believe what a difference it made to split up the two radiators.
(This is more than just "lowering" the oil radiator: they now don't
share any cooling air anymore). Amazing that just a 2 inch hole with
cold air for the oil cooler is doing much more than sending all the air
from the water radiator through the oil cooler.
You can
compensate this poor cooling by promoting air flow over the engine, but
this is more costly in drag terms than to just give the oil cooler a
dedicated air inlet of 2 inch.
Frans
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budyerly(at)msn.com
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| Posted: Wed Jun 09, 2010 2:11 pm Post subject: Cooling issues, once again! |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Frans,
Lowering the oil cooler and plugging the gap between the two is all that is necessary normally even for the 914. If you put the coolers dead behind one another you better only have a 912. Once the oil cooler is moved down as low as it can go and the leaks plugged around and between the coolers, it cools very well up to about 95 degrees F, then I hate to say it but I have to climb out at 90 Kts with power at 34 inches to keep the #3 cylinder temp below 250. Simple ducting to bring cooling air over the top cures that, but I still climb out at 90, to keep things at about 230. I run Evans coolant right now, just to test it, and found I prefer glycol as the engine runs a bit cooler. Now if I could stop this stupid turbo from leaking still.
In my cooling briefing I published I too feel as you, why not just bathe the coolers in their own air. It will work as you have seen.
Bud Yerly
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