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Purging a Rotax with an oil thermostat.

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rparigoris

Joined: 24 Nov 2009
Posts: 806

Posted: Tue Mar 15, 2011 8:18 pm Post subject: Purging a Rotax with an oil thermostat.

Hi group



Here's an interesting post from a guy on the Rotax group about purging a 912S with an oil thermostat:

http://www.europaowners.org/forums/gallery2.php?g2_itemId=87494



I have a 914 and will be installing a Mocal oil thermostat.

Ron Parigoris

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frans(at)privatepilots.nl
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Posted: Thu Mar 17, 2011 4:54 am Post subject: Purging a Rotax with an oil thermostat.

On 03/16/2011 05:18 AM, rparigoris wrote:



 	  Quote: 	
		   I have a 914 and will be installing a Mocal oil thermostat.


	


Have you thought about installing a mocal oil to water heat exchanger?

The Finnish guys are flying with these and use them for heating up the

oil as well as for cooling. (also when they make trips to warm south

European fields during summer, and they seem to experience less cooling

problems than other folks). They use it instead of an air cooled oil

radiator. So it actually saves weight, and with the traditional oil

cooler removed from the duct, you will find that the water cooling

capacity increases tremendously, more than enough to carry the

additional heat from the heat exchanger.



I will be using a somewhat modified scheme: I use a radiator and a heat

exchanger in series. The radiator is 50% smaller and is used to pre-cool

the oil. Then the oil goes through the heat exchanger. In winter this

warms up the oil, and in summer it provides additional cooling. During

winter flying and summer cruising I anticipate that the oil radiator is

not necessary so I will close it with a flap to minimize drag.

Some other Europa flyers are in the process of converting to a more

efficient cooling scheme with a heat exchanger as well, but I will let

them speak for themselves if they want to. Most of them intent to fly on

the heat exchanger exclusively and leave the radiator completely out.



Compared to an oil thermostat I feel that the failure potential is less,

and it also offers more potential to minimize drag. After all it is

somewhat ineffcient to drag air through a radiator while you don't want

to cool the oil at all and have the thermostat closed at the same time!

And I can already tell you from experience that removing the oil

radiator from the cooling duct does wonders to the cooling capacity of

the water radiator, and solves all cooling problems instantly.



Frans

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wdaniell(at)etb.net.co
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Posted: Thu Mar 17, 2011 5:16 am Post subject: Purging a Rotax with an oil thermostat.

Frans



Can you explain a little more about how the mocal installation works please?

I am assuming that the heat exchanger goes in downstream of the radiator so

that the oil is cooled at the coolest point of the system.

And also what are the specs of the heat exchanger.

Thanks

Will



--

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frans(at)privatepilots.nl
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Posted: Thu Mar 17, 2011 6:13 am Post subject: Purging a Rotax with an oil thermostat.

On 03/17/2011 02:13 PM, William Daniell wrote:



 	  Quote: 	
		   Can you explain a little more about how the mocal installation works please?


	


See http://www.thinkauto.com/laminova.htm

These things are mainly sold in Europe under the name Laminova and in

the US under the name Mocal.

I'm using a C43-90 (plus a small radiator).

Raimo Toivio (912S) is using a C45-112 and no radiator.

Jos Ockhuisen (914) was using a C43-180 as far as I can see from the

pictures.



 	  Quote: 	
		   I am assuming that the heat exchanger goes in downstream of the radiator so

 that the oil is cooled at the coolest point of the system.


	


That's correct. I have mine inserted into the horizontal part of the

coolant hose just before the U-bend to the water pump.



 	  Quote: 	
		   And also what are the specs of the heat exchanger.


	


See the same website, as well as various others.



Frans

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wdaniell(at)etb.net.co
Guest

Posted: Thu Mar 17, 2011 6:36 am Post subject: Purging a Rotax with an oil thermostat.

Frans 

And no oil cooler at all then?  That's interesting.

Of course the heat exchanger doesn't need to be in the airflow.

Thanks

Will

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