Today's Message Index:
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1. 10:08 AM - Re: Re: 912ul Sticking Valves and Carburetor questions. (Noel Loveys)
2. 01:06 PM - Re: 914 TCU seems dead (Gtblu)
3. 01:09 PM - Re: 912ul Sticking Valves and Carburetor questions. (Gtblu)
4. 08:54 PM - Re: 912ul Sticking Valves and Carburetor questions. (Roger Lee)
Message 1
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| Subject: | Re: 912ul Sticking Valves and Carburetor questions. |
If you are having some gas blowing out the throat of the carb it certainly
sounds like a valve sticking open a bit and not completely seating.
I'm with Roger on not leaving gas in y9our plane for extended periods. Your
engine may be one of the few cases where an hour or so of Ethanol
contaminated fuel may help clean out your engine and allow the valves to
clean up and function properly.
Noel Loveys
AME Intern, RPP
Kitfox III-A, 912 being installed.
Ivo IFA, Aerocet 1100 floats
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Roger Lee
Sent: Friday, November 21, 2008 1:03 AM
Subject: RotaxEngines-List: Re: 912ul Sticking Valves and Carburetor
questions.
Hi Paul,
Using Stabil is fine, I just advise against mixing different types of
fluids. I still think it is a carb problem. There are a couple of fuel
stabilizers on the market. If you fly often enough there is no need for a
fuel stabilizer. 91 octane shouldn't set in your plane or storage for more
than approximately 4 weeks. 100LL is more stable for the long haul, but you
pay the price in leading. If it was a valve it would be a problem all the
time and not just start up or only for the first few minutes. It's hard
sometimes to diagnose a problem through email or over the phone.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=215474#215474
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| Subject: | Re: 914 TCU seems dead |
Hi All,
Roger, I was interested in your comment about 91 fuel storage issues after 1 month.
What actually happens to it in terms of breakdown, and what will that do
to engine/carby?
regards
Geoff Bell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=215584#215584
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| Subject: | Re: 912ul Sticking Valves and Carburetor questions. |
Hi All,
Roger, I was interested in your comment about 91 fuel storage issues after 1 month.
What actually happens to it in terms of breakdown, and what will that do
to engine/carby?
regards
Geoff Bell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=215585#215585
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| Subject: | Re: 912ul Sticking Valves and Carburetor questions. |
Hi Geoff,
They teach this in the Rotax classes. It evaporates its additives and looses some of its octane rating the longer it sits. Keeping a tight lid on the fuel container only slightly helps. As much as I dislike 100LL it is a more stable fuel. 100LL is made with tighter controls than 91 octane and 100LL never comes in contact with other fuels like 91 octane might during its shipping to the final user. Using really old fuel in a high performance high compression engine may cause detonation and if left sitting in your carb / tank all winter it will evaporate and leave a film which reduces the orifice sizes in the jets. In the old days this happened much faster and a jet could get clogged up. Now days our fuel is a little more stable, but it still happens. The smaller the engine jets like a Honda 3 hp engine the jets orifices are small and letting the fuel set all winter may cause these jets to plug up. How do I know because I was an Mfg. of dive compressors (www.airlinebyjsink.com) (new owner) that used Honda 3-4 hp engines and someone was always calling me in the spring time and wanted to know why their engine didn't run right.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Service Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=215635#215635
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