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rotax high oil temp

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fprobst(at)HOTMAIL.COM
Guest

Posted: Tue Jun 10, 2008 1:55 pm Post subject: rotax high oil temp

I've been flying my newly built hd for several weeks.  Now the weather is warmer and my oil temps are too high.  I've tried everything to get more flow into the cooler but I can not get the temps into a more comfortable range.  the problem is I have the older style cowl where the oil cooler is right under the gear box.  Later ZAC changed to the cooler in the belly of the cowl.  I was planing to switch to the newer style cowl to get rid of my problems but no one makes it any more.  Here is were I need your help.  Does by chance anyone have the cowl I'm looking for?  Or has any one been able to cool their 912S using the older style cowl?  Any help would be appreciated.  This being grounded thing sucks!\

  

 Thanks

  

 Frank Probst

   [quote][b]

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psm(at)att.net
Guest

Posted: Tue Jun 10, 2008 2:17 pm Post subject: rotax high oil temp

Hi Frank,



 There is a great article by Christopher Zavatson: "Cooling Drag" in  the December 2007 issue of Sport Aviation - the primary publication of the EAA.  I suggest you read this article.  If you can implement any of the  ideas in it you may make great progress with your oil cooling problem.



 I am not familiar with the Rotax or the cowls you are dealing with, so I can't really make any useful comments directly about your problem.  However, I believe you can fix your problem with some fiberglass and/or RTV work to improve the air flow through your cowl.



 Good luck,



 Paul

 XL fuselage



 At 02:53 PM 6/10/2008, you wrote:

 [quote]I've been flying my newly built hd for several weeks.  Now the weather is warmer and my oil temps are too high.  I've tried everything to get more flow into the cooler but I can not get the temps into a more comfortable range.  the problem is I have the older style cowl where the oil cooler is right under the gear box.  Later ZAC changed to the cooler in the belly of the cowl.  I was planing to switch to the newer style cowl to get rid of my problems but no one makes it any more.  Here is were I need your help.  Does by chance anyone have the cowl I'm looking for?  Or has any one been able to cool their 912S using the older style cowl?  Any help would be appreciated.  This being grounded thing sucks!\

  

 Thanks

  

 Frank Probst



  

 [b]

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Tue Jun 10, 2008 2:56 pm Post subject: rotax high oil temp

The most effective way to improve cooling air flow is to make it easier for the air to exit the cowl. I greatly improved the cooling for my Subaru engine by adding a lip around the air outlet at the bottom rear of my cowl. This lip is about an inch wide and slopes down and back from the front edge of the opening. It creates a low pressure bubble of air over the opening to help suck the air out of the cowling. I originally riveted some scrap aluminum strips just forward of the opening as a temporary solution, This solved my cooling problem and I eventually removed the aluminum strips and formed a lip out of fiberglas to make it permanent. I just used fiberglas cloth and polyester resin from the auto parts store. No more cooling issues. You may have to add some baffling inside the cowl to direct air through the cooler but it won't do any good if the air can't get out of the cowl.

On Jun 10, 2008, at 5:53 PM, Frank Probst wrote:

 	  Quote: 	
		  I've been flying my newly built hd for several weeks.  Now the weather is warmer and my oil temps are too high.  I've tried everything to get more flow into the cooler but I can not get the temps into a more comfortable range.  the problem is I have the older style cowl where the oil cooler is right under the gear box.  Later ZAC changed to the cooler in the belly of the cowl.  I was planing to switch to the newer style cowl to get rid of my problems but no one makes it any more.  Here is were I need your help.  Does by chance anyone have the cowl I'm looking for?  Or has any one been able to cool their 912S using the older style cowl?  Any help would be appreciated.  This being grounded thing sucks!\

 



	




 -- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.



 



 [quote][b]

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

daveaustin2(at)primus.ca
Guest

Posted: Tue Jun 10, 2008 3:22 pm Post subject: rotax high oil temp

Right on, Brian.  You have to suck the hot air  out of the cowl.  You cannot blow it out!  I put the lip on the outlet  as you did.  Fixed the whole problem.

 Dave Austin  601HDS - 912, Spitfire Mk  VIII

    [quote][b]

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