Today's Message Index:
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1. 09:45 AM - Re:Lycoming carb question (Dennis Persyk)
2. 03:26 PM - Re: Re:Lycoming carb question (Knicholas2@aol.com)
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| Subject: | Re:Lycoming carb question |
> Time: 12:27:45 PM PST US
> From: Knicholas2@aol.com
> Subject: RV-List: Lycoming carb question.
Hi Kim,
Flight instruments aside, does the engine behave like it is too lean when
the mixture knob is in at cruise less than 75% power? That is, if you
slowly lean, does the EGT decrease?
If you are in fact flying lean of peak, the exhaust temps will be less than
peak because the cooling is coming from excess air instead of excess fuel.
I guess I don't understand your "high EGT" temps if your readings are at
cruise configuration. All the EGT instruments I'm familiar with indicate
relative temps.
I'm not saying you don't have a lean carb problem - just curious if the
simpler determination of mixture gives the same indication.
Good landings,
Dennis
N600DP 6a sold http://home.att.net/~dpersyk/rv6a.htm
>
> I have an 0-320 E2D in my RV9A and have fighting high CHT's. The engine
> monitors suggest that the engine is running too lean, therefore
> contributing
> to
> the high CHT and exhaust temps. I learned yesterday that lycoming
> apparently makes 2 different carbs for this engine. One runs
> leaner/richer than
> the
> other. One of the guys in my EAA chapter said that he had the same
> problem
> with his 0-320 until he changed to a richer running carb and now has no
> problems.
>
> Can anyone tell me which carb for the 0-320 is the one that runs rich?
>
> Thank you.
>
> Kim Nicholas
> RV9A
> Auburn, WA
>
Message 2
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| Subject: | Re:Lycoming carb question |
Thanks for the interest. Yes, everything points to a lean running engine.
Another RV-lister sent me information that it is common for the 10-5009
carbs to run lean. He is send me a new carb jet (apparently there was a Lycoming
service bullitin about it) to make it run more rich. I will post my
results on the list.
Regards,
Kim Nicholas
In a message dated 6/12/2008 9:48:35 A.M. Pacific Daylight Time,
dpersyk@worldnet.att.net writes:
--> RV-List message posted by: "Dennis Persyk" <dpersyk@worldnet.att.net>
> Time: 12:27:45 PM PST US
> From: Knicholas2@aol.com
> Subject: RV-List: Lycoming carb question.
Hi Kim,
Flight instruments aside, does the engine behave like it is too lean when
the mixture knob is in at cruise less than 75% power? That is, if you
slowly lean, does the EGT decrease?
If you are in fact flying lean of peak, the exhaust temps will be less than
peak because the cooling is coming from excess air instead of excess fuel.
I guess I don't understand your "high EGT" temps if your readings are at
cruise configuration. All the EGT instruments I'm familiar with indicate
relative temps.
I'm not saying you don't have a lean carb problem - just curious if the
simpler determination of mixture gives the same indication.
Good landings,
Dennis
N600DP 6a sold http://home.att.net/~dpersyk/rv6a.htm
>
> I have an 0-320 E2D in my RV9A and have fighting high CHT's. The engine
> monitors suggest that the engine is running too lean, therefore
> contributing
> to
> the high CHT and exhaust temps. I learned yesterday that lycoming
> apparently makes 2 different carbs for this engine. One runs
> leaner/richer than
> the
> other. One of the guys in my EAA chapter said that he had the same
> problem
> with his 0-320 until he changed to a richer running carb and now has no
> problems.
>
> Can anyone tell me which carb for the 0-320 is the one that runs rich?
>
> Thank you.
>
> Kim Nicholas
> RV9A
> Auburn, WA
>
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