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                           RotaxEngines-List Digest Archive
                                      ---
                     Total Messages Posted Fri 04/14/06: 3
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Today's Message Index:
----------------------
 
     1. 01:04 AM - Re: carburetor ice and electric carb. heater  (Dave Grosvenor - DreamWings)
     2. 05:01 AM - Re: RotaxEngines-List Digest: 1 Msgs - 04/13/06  (Tim Perkins)
     3. 08:11 PM - exhaust on the 912  (Jack Kuehn)
 
 
 
________________________________  Message 1  _____________________________________


Time: 01:04:29 AM PST US
From: "Dave Grosvenor - DreamWings" <dave@dreamwings.co.za>
Subject: Re: RotaxEngines-List: carburetor ice and electric carb. heater

--> RotaxEngines-List message posted by: "Dave Grosvenor - DreamWings" <dave@dreamwings.co.za>

Thom

These guys sell a water based carb heater. 
http://www.skydrive.co.uk/sd_sa_ch.asp  Hot water from your engine is used 
to heat the throat of the carb.

Dave


----- Original Message -----
Subject: RotaxEngines-List: carburetor ice and electric carb. heater
> From: "Thom Riddle" <jtriddle@adelphia.net>
>
> --> RotaxEngines-List message posted by: "Thom Riddle" 
> <jtriddle@adelphia.net>
>
> Although Rotax 912 series engines with the Bing 64 carburetors are not 
> very prone
> to carburetor ice, it does happen under some conditions. On the return 
> trip
> from Clarksville, Tennessee to Buffalo, New York this past Monday. I 
> experienced
> carb. ice when approaching the relatively high humidity region near Lake 
> Erie.
> We were cruising at 5,500' msl at 5,200 rpm when I noticed a slow descent
> and lower engine RPM (5,000 rpm). The OAT was about 43F (6C), nearly ideal 
> conditions
> for carb. ice with high humidity.
>
> Since our engine is not equipped with carb. heat, I advanced the throttle 
> but no
> change in power or RPM and we kept descending slowly. The engine was 
> obviously
> developing less power than two mintues before but there was no indication 
> other
> than the lower RPM and lack of increase with full throttle. I cycled the
> throttle to idle and back to full throttle a couple times and it cleared 
> up completely
> without skipping a bit and never returned for the remainder of the 600nm
> flight.
>
> Moral of story is when in high humidity conditions keep a watchful eye on 
> RPM when
> cruising. If you catch it early it can usually be cleared very easily and
> quickly on this type carb. by cycling the throttle to idle and back a 
> couple of
> times. Once the ice starts building up it continues to build up rapidly 
> and
> becomes serious very quickly if not dealt with early.
>
> I've heard someone makes an electric carb. heater for the Bing 64 but 
> don't know
> who sells them. Anyone out there know abou this and a source? I know the 
> HKS
> engine importer in the USA sells a 12 watt one for the HKS which uses the 
> Bing
> 64 carbs. but I don't think that is enough power to de-ice a carb once the 
> ice
> starts forming. I've heard there is a 60 watt model available somewhere.
>
> Thom in Buffalo
>
>


________________________________  Message 2  _____________________________________


Time: 05:01:33 AM PST US
From: "Tim Perkins" <Timothy.Perkins@uvm.edu>
Subject: RotaxEngines-List: RE: RotaxEngines-List Digest: 1 Msgs - 04/13/06

--> RotaxEngines-List message posted by: "Tim Perkins" <Timothy.Perkins@uvm.edu>


> Although Rotax 912 series engines with the Bing 64 
> carburetors are not very prone to carburetor ice, it does 
> happen under some conditions. On the return trip from 
> Clarksville, Tennessee to Buffalo, New York this past Monday. 
> I experienced carb. ice when approaching the relatively high 
> humidity region near Lake Erie.

What type of aircraft you flying Tom?

Tim Perkins, VT


________________________________  Message 3  _____________________________________


Time: 08:11:30 PM PST US
From: Jack Kuehn <jkuehn@mountaintime.myrf.net>
Subject: RotaxEngines-List: exhaust on the 912

--> RotaxEngines-List message posted by: Jack Kuehn <jkuehn@mountaintime.myrf.net>

I am new to the list, and I have a question:  My Rotax 912 UL has 40 
hours on it, and the exhaust outlet is black, and a finger swipe inside 
the outlet comes out sooty black.  Is this normal?  My home field is at 
3600' and I regularly fly between 5500 and 9500.  Is the mixture too 
rich?  I have the 2.27:1 gear reduction and run 87 octane autogas.  
Mobil MX4T Synthetic motorcycle oil and an oil thermostat.  Temps all 
run very normal, engine performs well.  What do others see?

Thanks,

Jack