582 high engine temp
in 2 Stroke Technical Questions
13 years ago
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by bill martin » 13 years ago
Mike,
My operating temps were around 170f at WOT and 150 at cruise and I had to use adjustable louvers to keep the cruise temps up around 150f in the winter.
You may get into a strange situation with no thermostat in the engine. The 582 thermostat acts as a two way valve which forces coolant through the bypass when the thermostat is closed and through the radiator when the thermostat is open. With no thermostat in the engine, the coolant can go through the bypass and the radiator at the same time.
I have never tried to run a 582 without a thermostat so I can't say how the temps would react. It wouldn't hurt to try if you keep a close eye on the temps. Just a guess, but if the thermostat is bad and permanently closed, removing it could only help. How much I couldn't say and there would be no temperature regulation.
I have always run a 50/50 mix of silicate free Dexcool antifreeze.
Another thing you might check is to pull the pump housing off the block and see if the impeller is OK and tight and no debris inside.
Bill.
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by Michael Regan » 13 years ago
Nick, although I tend to agree, I still might consider less anti-freeze...say 40/60. Nobody knows the Rotax engine better than Rotax, so I guess it's best not to wander too far from their recommendations. As far as I know there is nothing new in the airflow.
mike
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by Michael Regan » 13 years ago
Wow bill, thanks for your temps. I realize now this engine has always over heated and its only because this is the first time I have flown in the higher OAT range that has caused it to over heat. Even in the winter it would reach 180 with WOT if I climbed more than 1000 ft at a time, and cruise aprox 165-170. Time to doto the same to the cooling system as I did with the fuel system.
Thanks to all for helpful comments.
mike
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by Ian Jones » 13 years ago
I have had this problem, and checked everything including the thermostat and water temp sensor.
My problem was the capacity of the radiators - I used the 2 part radiator system. You will find that the blue head 582 requires larger size radiator cores. Check the CPS catologue which will show the different configurations. When I fitted a new blue head 582 in place of the older grey head 582, I did not change to the larger radiators. This resulted in overheating every time I flew, and was becoming a serious problem to manage the water temperature. Once I realised what the issue was, I fitted a third radiator panel - problem solved.
So my advice - investigate the ability of your radiator(s) to provide sufficient cooling capacity.
Pud.
Thank you said by: Michael Regan
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by Michael Regan » 13 years ago
Hey Pud, actually I apologize for not adding earlier that I have the old grey head and it does have the 2 part radiator system. I still wonder though if I can add a mod to increase capacity like yours? Last evening I took it out again after withdrawing one liter of coolant and adding one liter of distilled water. Although it still reached 185 degrees in a climb to 1500' it did however cruise after it settled down at about 165 degree which is a bit better than before. I say "about" because I can only guess, so I made a picture of the same gauge as my Mitchell temp gauge (below) to ask you guys what temps do you think are position 1 and 2 (in case the pic dont look too good, that is the two dashes between 100 and 180). I was assuming it was pos 2 = 140 and 3 = 170.TempGuageEdit.jpg (You do not have access to download this file.)
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