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Carb heat mod

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willie.harrison(at)tinyon
Guest

Posted: Wed Jan 18, 2006 6:20 am Post subject: Carb heat mod

What experience does anyone else have of carb icing on Rotax powered

Europas? I had thought that the standard set up was supposed to be

largely immune but I encountered some serious icing yesterday. In the

cruise at 5,200 rpm, 5000 feet, outside air temp approx zero, in clear

air above broken cloud. First of all there was a steady loss of rpm to

4.800 at the same throttle setting and then when full power was applied

for 30 seconds there were two "kerthumps", presumably as the two carbs

lobbed their two ice cubes into the engine. Fuel is 100% avgas. Coolant

and oil were both running at approx 80C.



The only thing I can think of which is non standard with the way mine is

built is that the inlet air filter has been re-positioned to be directly

in line with the NACA inlet so there is no chance for the inlet air to

swirl around under the cowlings to pick up some heat. Has anyone else

heard of this mod?



What is anyone's experience with carb heaters on this engine?



Cheers



Willie Harrison



G-BZNY - now piling on the hours after some grim teething troubles....

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j.heijboer(at)vmij.nl
Guest

Posted: Wed Jan 18, 2006 7:49 am Post subject: Carb heat mod

Willie,

Would be nice to know which type of rotax you are refering too.

Regards jack H



-----Oorspronkelijk bericht-----

Van: owner-europa-list-server(at)matronics.com

[mailto:owner-europa-list-server(at)matronics.com]Namens willie harrison

Verzonden: woensdag 18 januari 2006 15:18

Aan: europa-list(at)matronics.com

Onderwerp: RE: Carb heat mod




What experience does anyone else have of carb icing on Rotax powered

Europas? I had thought that the standard set up was supposed to be

largely immune but I encountered some serious icing yesterday. In the

cruise at 5,200 rpm, 5000 feet, outside air temp approx zero, in clear

air above broken cloud. First of all there was a steady loss of rpm to

4.800 at the same throttle setting and then when full power was applied

for 30 seconds there were two "kerthumps", presumably as the two carbs

lobbed their two ice cubes into the engine. Fuel is 100% avgas. Coolant

and oil were both running at approx 80C.



The only thing I can think of which is non standard with the way mine is

built is that the inlet air filter has been re-positioned to be directly

in line with the NACA inlet so there is no chance for the inlet air to

swirl around under the cowlings to pick up some heat. Has anyone else

heard of this mod?



What is anyone's experience with carb heaters on this engine?



Cheers



Willie Harrison



G-BZNY - now piling on the hours after some grim teething troubles....

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rholder(at)avnet.co.uk
Guest

Posted: Wed Jan 18, 2006 8:58 am Post subject: Carb heat mod

Jeremy Davey wrote:



 	  Quote: 	
		   It's my understanding that carb icing is not a problem

 on Rotaxes _with_heated_carbs_. I've certainly heard of

 problems on Rotaxes with no carb heat. There are two

 ways I know of of doing this - one is sold over here in

 the UK by the Rotax agents Skydrive and uses the engine

 coolant to heat the carb body, the other uses

 electrical heating of the carb body (I think a recent

 issue of Popular Flying had details).


	


The one in Popular Flying has not been approved as a Mod yet !



My 912S with the carb heaters still gave some symptoms of

carb ice when the water temperature wasn't high enough.



 	  Quote: 	
		   Note that neither uses heating of the induction air!

 Hence there is no power loss and they are usually

 permanently engaged.


	


There is a third way. On the Polish AT3 visible at North

Weald, which I had some dealings with, the 912S has a full

carb air heat system installed along with a cabin heater

(using the exhaust silencer [muffler] warmth).

Now that I woud like on a brrrrr freezing day up there !



Richard

Tri-gear G-OWWW High Cross

WIth oil thermostat fitted waiting fro a flyable day to test !

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terrys(at)cisco.com
Guest

Posted: Wed Jan 18, 2006 10:02 am Post subject: Carb heat mod

Hi,



   We have a mono-wheel XS with 912S and Skydrive carb heaters.  We

initially left the carb heat on all the time, but found it can cause hot

starting problems if left on prior to shutdown.  We then installed a

water valve to the heaters, turning the carb heat on only when needed.

Since then we have had carb ice on the ground and in the air.  In all

cases, the carb ice went away immediately after turning the heat back

on.

   We also found, through careful testing, that there is indeed no loss

of power with the carb heat on.



Regards,

Terry Seaver

A135 / N135TD

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SPurpura(at)AOL.COM
Guest

Posted: Wed Jan 18, 2006 6:30 pm Post subject: Carb heat mod

912 or 914 power?

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rholder(at)avnet.co.uk
Guest

Posted: Thu Jan 19, 2006 1:25 am Post subject: Carb heat mod

 	  Quote: 	
		   912 or 914 power?


	


As I understand it the 914 doesn't need one because of the 

forced induction.



So carb heaters on 912 and 912S only.



Richard

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willie.harrison(at)tinyon
Guest

Posted: Sat Jan 21, 2006 7:19 am Post subject: Carb heat mod

912uls



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