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Rotax Water Temperature.

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mikenjulie.parkin(at)btop
Guest

Posted: Sat Jan 13, 2007 11:32 am Post subject: Rotax Water Temperature.

Has anyone come across a modification scheme to  introduce a water temperature sensor into the 914 engine  installation.

  

 regards,

  

 Mike

  

   [quote][b]

william(at)wrmills.plus.c
Guest

Posted: Sat Jan 13, 2007 11:56 pm Post subject: Rotax Water Temperature.

Mike,

 If you monitor the temp of the expansion tank using  a temporary thermocouple taped to the tank and a digital hand held  thermometer, you can record the differential temp between the CHT and exit  coolant temp.  Then you put another max line on your CHT gauge for coolant  and the job is done.  My exit coolant temp works out at 25 degs C less  than the CHT pretty well throughout the range.  I understand that doing it  this way is an acceptable compliance with the SB and saves another  instrument in the panel (unless, of course, you have an all singing all dancing  EIS) and more plumbing and wiring etc.  If you wish to monitor coolant temp  directly all the time, Skydrive sell an insert tube with a sensor for one  of the coolant return pipes to the expansion tank, plus gauge etc.  Hope  that helps.

 Best wishes,

 William

  

 [quote]   ---

Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Jan 14, 2007 3:06 am Post subject: Rotax Water Temperature.

 	  Quote: 	
		    My exit coolant temp works out at 25 degs C less than the CHT pretty 

 well throughout the range.


	


William,



25°C seems a great temperature difference between the CHT and the 

coolant flowing out of the heads. That would mean that even at the 135°C 

CHT red line (Rotax 914), your coolant would not exit the the heads 

above110°C ? Or flying at 100°C CHT, the coolant would not exceed 75°C ?

All the measurements I did showed a difference on the order of 5°C.

Have you tried checking the two temperature measuring devices in the 

same water or oil bath ?



Regards,

Gilles

http://contrails.free.fr

mikenjulie.parkin(at)btop
Guest

Posted: Sun Jan 14, 2007 9:00 am Post subject: Rotax Water Temperature.

Thanks a lot.  Looks a very elegant solution  to the problem.  But I think the Skydrive Kit might be a little easier to  implement.

  

 regards,

  

 Mike.

 [quote]   ---

mikenjulie.parkin(at)btop
Guest

Posted: Sun Jan 14, 2007 9:03 am Post subject: Rotax Water Temperature.

William,

  

 Happy New Year.  The Skydrive kit looks  ideal.

  

 When I pull the engine for Mod 72, I plan to bin  the Evans and go back to 50/50 Glycol Mix.  With a 2 function Westach Gauge  I can avoid anymore instrument holes.  At the same time I will fit my cowl  flap.

  

 regards,

  

 Mike.

  

 (do not archive)

  

   [quote][b]

sidsel.svein(at)oslo.onli
Guest

Posted: Sun Jan 14, 2007 11:08 am Post subject: Rotax Water Temperature.

Mike,

  

 I recently fitted the Skydrive kit, less the  reading instrumet because I connected the temp. sender to an available  auxiliary input channel in my Grand Rapids EIS.  As recommended by Skydrive  I installed the temp. sender in the coolant hose from cyl. no. 3 to  the common expansion tank on top of the engine.  Should be one of the two  aft sylinders because they run hotter due to less direct cold air flow.  It  is tight there, at least on my 912S installation, but if you plan well before  you cut the hose it is no problem.  I use 50/50 battery  water/glycol.

  

 I do not see the merit of measuring the temperature  of the coolant in the expansion tank, as this will be a mix of the coolant from  all 4 cylinders where the two front ones have significantly lower  CHT.  

  

 Trust you have the latest revision of the Rotax SB  addressing the alarm limit for the coolant temperature.

  

 For those reading this and having used the 4  ring thermocouples delivered by Grand Rapids for CHT:  I insulated the  visible part of the thermocouples and the attachment bolts and an inch around  where installed, using the red high-temperature Locktite sealant.  Put on a  good, thick blob.  It made a noticeable difference in the readings for the  two front cylinders, now reading some 15-20 degr C higher than before but still  well below the two aft ones.  The measuring points are directly  in the cold air coming in through the two openings in the cowling.   The measuring point in the VDO sender used by Rotax Flydat picks up the  temperature deeper in the CH and is therefore not as directly exposed to the  cooling air as the thermocouples are.

  

 Regards,

 Svein

 LN-SKJ

  

   [quote][b]

mikenjulie.parkin(at)btop
Guest

Posted: Sun Jan 14, 2007 11:50 am Post subject: Rotax Water Temperature.

Svein,

  

 Thanks a lot.  Skydrive, Cylinder No 3 it is  then.

  

 regards,

  

 Mike

  

 [quote]   ---

jodel(at)nildram.co.uk
Guest

Posted: Sun Jan 14, 2007 12:54 pm Post subject: Rotax Water Temperature.

Mike,  

   

I spoke to Andy about the skydrive kit about 6 weeks ago.  There is (unbelievably) no standard mod for this and he said that a mod application would be required.  Personally I think that it is a ridiculous situation for the PFA to expect us to embody all Rotax SB’s on our engines but to also require us to wait 3months for them to process the mod paperwork AND pay for the privilege!  

   

Simon  

         

  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Mike Parkin

 Sent: 14 January 2007 19:49

 To: europa-list(at)matronics.com

 Subject: Re: Rotax Water Temperature.  

  

     

Svein,  

    

   

    

Thanks a lot.  Skydrive, Cylinder No 3 it is then.  

    

   

    

regards,  

    

   

    

Mike  

    

   

  [quote]    

---

mikenjulie.parkin(at)btop
Guest

Posted: Sun Jan 14, 2007 1:12 pm Post subject: Rotax Water Temperature.

Simon,

  

 Now why does that not surprise me.   The  aims of the PFA????  - beam me up Scotty.

  

 thanks,

  

 MIke

  

 [quote]   ---

n914va(at)bvunet.net
Guest

Posted: Sun Jan 14, 2007 4:49 pm Post subject: Rotax Water Temperature.

I think this is where the FAA would like to take us  here on the left side of the pond. Thank God we still have the second  amendment(unless of course the Democrats get their way). What??....... I didn't  say that!!

  

 Vaughn

 [quote]   ---

william(at)wrmills.plus.c
Guest

Posted: Mon Jan 15, 2007 3:42 am Post subject: Rotax Water Temperature.

Hi Gilles,



I tested the digital thermometer / thermocouple, when I bought it, in 

boiling water and, allowing for STP, it is accurate.  The CHT is the 

standard Rotax sender / VDO gauge and has served me well for 1100 hours, but 

I have never tested it for accuracy.



Mine is a Classic so I have the massive rads in the nose, which are about 60 

% blanked off in the winter and about 30 % blanked off in the summer to 

maintain about 85 to 90 degs C in the cruise.  In the early days I ran with 

80% glycol and now I run at 50%.  I tried the Evans for about 25 hours and 

then discarded it because its cooling qualities were so inferior.  I have 

cowl flaps for increasing the exit area for sustained climbs in hot weather, 

which reduce temps by about 10 degs C.



Maybe the heat transfer from coolant to thermocouple by just taping it to 

the outside of the tank is not good enough, or perhaps the coolant from the 

front pots is reducing the average in the expansion tank by 15 to 20 degs. 

Anyway, I have never had problems with high temps, so it is all a bit 

academic for my aircraft.



Regards,



William



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