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914 coolant temp

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Fri May 14, 2010 11:32 am Post subject: 914 coolant temp

Greetings,  

        The Rorax Corp insists on a coolant temp reading and suggests I believe the horizontal section of tubing exiting the reservoir (in amongst a sea of various components – and a real hardship to acquiesce.  

        On the other hand, there’s a kind open section vertical down towards the rad, which tempts as an alternative. Methinks there’s not much difference in the temps twixt one and t’other. It might lose a degree or two en route.  

        Has someone pronounced on this?  

Thanks, Ferg     [quote][b]

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Fri May 14, 2010 12:05 pm Post subject: Re: 914 coolant temp

Hi Ferg,



Actually, it is Rotax's intent that airframe manufacturers measure the

reservoir temp, not individual builders. The idea is to be absolutely sure

that the engine cooling system never allows the coolant to rise to

a temp which would ruin (anneal) the cylinder heads!



Of course, since Europa never did this test, it is up to you.  

On the 912s, like mine, it was the paragon of simplicity to cut the 

rubber coolant hose about two inches from the reservoir outlet 

and use the Lockwood-supplied t-splice to place a thermistor in the 

coolant stream.



The hottest common point in the coolant system is the reservoir, so

your measurement point must be as close as possible!  A more 

accurate system would put a thermistor in the coolant drain line from

each cylinder, but lets not go crazy here

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_________________
Ira N224XS

paul.the.aviator(at)gmail
Guest

Posted: Fri May 14, 2010 1:15 pm Post subject: 914 coolant temp

Hi All,



I recently replaced the coolant hoses on my engine so while I had them all off I put a thermister in the reservoir.  To do this I needed to TIG weld on a patch of aluminum to make it thick enough so I could put a thread in it for the temperature sensor.

 

To be honest, unless you have a particular reason to be pulling it apart using the use the Lockwood-supplied t-splice is much easier.



General question to the forum.  I have often wondered if the heads got annealed if it would be practical to have them heat treated.  I would assume that the value guide inserts and the seats would have to be removed and re installed after treatment.

 

Thoughts anyone ?



Paul

  [quote][b]

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rlborger(at)mac.com
Guest

Posted: Fri May 14, 2010 5:39 pm Post subject: 914 coolant temp

 	  Quote: 	
		  Paul,



Unfortunately, the answer is no.  



Go to Europa Owners photo gallery, page 2 and select the Lockwood School album.  Go to page two of that album, Picture DSCN5124 and SDCN5125 to see what happens when you anneal one of the heads.  It almost always means a new head and cylinder because you probably won't know it happened till the head bolts won't stay tight and the damage has been done by the combustion gasses.



Best regards,

Bob Borger



On Friday, May 14, 2010, at 04:14PM, "Paul McAllister" <paul.the.aviator(at)gmail.com> wrote:

 	  Quote: 	
		  	
  Hi All,

 
	


I recently replaced the coolant hoses on my engine so while I had them all off I put a thermister in the reservoir.  To do this I needed to TIG weld on a patch of aluminum to make it thick enough so I could put a thread in it for the temperature sensor.

  

To be honest, unless you have a particular reason to be pulling it apart using the use the Lockwood-supplied t-splice is much easier.

 

General question to the forum.  I have often wondered if the heads got annealed if it would be practical to have them heat treated.  I would assume that the value guide inserts and the seats would have to be removed and re installed after treatment.

  

Thoughts anyone ?

 

Paul

    	  Quote:

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