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Carburetor Ice?

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ajroseca(at)nf.sympatico.
Guest

Posted: Thu Sep 25, 2008 2:58 pm Post subject: Carburetor Ice?

Hi Guys

  

 What are the symptoms of carburetor Ice and has  anyone seen it

 happen with the 912uls 100 hp engine   Today I had my

 engine speeding up and slowing down..When you  increase the throttle

 setting the engine was like it was runing out of  gas.But I had half tanks

 .i was about 5 miles from the airport so I reduced the power

  and set up a glide for the runway  and

 got in ok ..I was at 3500 ft so I had lots of glide  range as I still had power.

 The engine did not stop and I landed ok. I had this  happen one time  before

 when there was about 20 hours on it.I have 128 hours on it now

 .It slowed like it was going to stop. 

 It was pulsing and increasing and reducing the power..I thought it might  have

 been where i was on a long decent and the gas was not covering the outlets  from the

 tank so it was sucking air..It is not a nice feeling when this  happens..

 What should I check to solve this problem..

 I saw some dirt in my gas filter today so I will replace it..There was no  dirt

 in it when it happened at 20 hours... any help would be   appreciated...

  

 Alvin Rose

 Marystown, NL.

 ajroseca(at)nf.sympatico.ca (ajroseca(at)nf.sympatico.ca)



   [quote][b]

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n752ms(at)softcom.net
Guest

Posted: Thu Sep 25, 2008 9:26 pm Post subject: Carburetor Ice?

Alvin.

  

 The Rotax 912 ULS comes with a manifold for carb  heat and cold air intake.  It insures that you get the full 100 HP you paid  for, by supplying cold air to the carbs and to supply heated air for  carb heat.

  

 Did that not get installed on your  701?

  

 Mark S.

  

 701/912ULS

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Fri Sep 26, 2008 12:56 am Post subject: Re: Carburetor Ice?

Alvin,

        What you describe is not the usual carb ice symptoms although with 2 carbs it could manifest that way.

I have had a  power loss 6 times now which first thought was carb ice but now certain caused by steep descent or unbalanced attitudes causing unporting of the fuel feed. On separate occasions during ground running above damp grass I've had carb ice and cleared it with carb ht. then let it occur again and clear again just to confirm. My engine is a 2200 however it uses the same model of carb as the 912 and although I see many not fitting a heat system its proved necessary for me.



Ralph

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_________________
Ralph - CH701 / 2200a

dougsnash

Joined: 14 Apr 2008
Posts: 281

Posted: Fri Sep 26, 2008 3:10 am Post subject: Carburetor Ice?

In uncertified installations, the carb heat plenum is an option (about $1000).  I spoke with Zenith about the best carb heat option for the 701 because I am in Canada and carb heat is manditory.  The answer I got is that due to the intake air coming from inside the cowing after the air has passed through the rad and oil cooler, carb ice would be unlikely(or at least something to that effect).



The following information is what I did but keep in mind that I am not yet flying.  I purchases an older used genuine Rotax carb heat plenum and have modified it to fit my 701.  The newer style carb heat plenums would likely fit better but the price was right on the used item.



For hot air supply I have tapped into the cabin heat shroud.  For cold air I built a holder and fiberglass duct for a 6"X6" automotive K&N air filter.  The filter assy is mounted oppisite the oil tank.  This will be fed via a NACA duct from the side of the cowl.



Lockwood aiviation also has a heatable spacer block that uses warmed coolant to heat the base of the carb.  This system won't have the added benifit of providing your engine with cold intake air.



Hope these ideas help you guys with this issue.



Doug MacDonald

CH-701 Scratch builder

NW Ontario, Canada



Do Not Archive



--- On Fri, 9/26/08, Mark Sherman <n752ms(at)softcom.net> wrote:



 	  Quote: 	
		   From: Mark Sherman <n752ms(at)softcom.net>

 Subject: Re: Carburetor Ice?

 To: zenith701801-list(at)matronics.com

 Date: Friday, September 26, 2008, 12:21 AM

 Alvin.

 

 The Rotax 912 ULS comes with a manifold for carb heat and

 cold air intake.  It insures that you get the full 100 HP

 you paid for, by supplying cold air to the carbs and to

 supply heated air for carb heat.

 

 Did that not get installed on your 701?

 

 Mark S.

 

 701/912ULS

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Max Johansson

Joined: 09 Jan 2006
Posts: 25
Location: Helsinki, Finland

Posted: Fri Sep 26, 2008 3:33 am Post subject: Carburetor Ice?

Listers



Anybody have any experience with

carburettor hot water collars

suitable for any 912 engine ?



rgrds

Max

[quote]--

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_________________
Max

Max Johansson, Helsinki, Finland
Building a CH701SP-912S
on CZAW amphibian floats

mcolbeck

Joined: 31 Dec 2006
Posts: 13
Location: Cochrane, Alberta

Posted: Fri Sep 26, 2008 5:37 am Post subject: Re: Carburetor Ice?

Guys I have the 912ULS and received the heater manifold as well. One issue is that with the Ring mount the manifold no longer fits and I see it being very difficult to install or modify to make work. I did order the coolant ring or collar. Has anyone used this? Will I lose much power due to it being warn all the time? If I put a valve on it will it heat up fast enough to be effective? I fly in Canada (just not my plane yet) and it is a must to have carb heat. I have heard that electric heat is not allowed in Canada because if you have an electrical failure it no longer works. I would like to put on the original manifold from Rotax but I just dont see that fitting. If not I guess I have a shiny new manifold for sale.

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_________________
CH701 Builder and new flyer
Rudder, HS, and Elevator completed
Left wing Complete
50% complete on Right Wing
99% Complete on Fuselage
Engine installed almost ready to fire
Instrument panel and electrical Complete

ajroseca(at)nf.sympatico.
Guest

Posted: Fri Sep 26, 2008 9:12 am Post subject: carburetor Ice?

Hi Mark

 No my engine did not come with a manifold for carb  heat

 and cold air intake..All it has is two K&N air  filters

 at the input of the carbs..I understood that these  engines

 are not prone to this carb heat problem..I am  checking the fuel

 filters and fuel flow, If necessary I will  get the manifold you suggested.

 Thanks for the suggestions

 Alvin Rose

  

 Time: 10:26:41  PM PST US

From: "Mark Sherman" <[url=]n752ms(at)softcom.net[/url]>

Subject: Re: Carburetor  Ice?



Alvin.



The Rotax 912 ULS comes with a manifold for carb heat  and cold air 

intake.  It insures that you get the full 100 HP you paid  for, by 

supplying cold air to the carbs and to supply heated air for carb  heat.



Did that not get installed on your 701?



Mark  S.



701/912ULS



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