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jdy100(at)comcast.net
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 Posted: Sat Nov 24, 2007 10:23 am Post subject: question on carb jet needle settings |
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Regarding carb jet needle adjustments: On a 503 DCDI with the Bing 54 carbs, what is the proper proceedure for jet needle adjustments to account for summer to winter air temp. drops? I've been told by some local pilots I must change the position from 1 to 2 at this time of year, or I will run too lean and can damage the engine. My plane runs great, been flying it in air temps from the mid 80's in Oct. to yesterday's 48 deg. (at) mid afternoon. I see no difference in performance, CHT, temps, or EGT's other than maybe 10 to 15 deg. cooler on yesterday's CHT's. I don't plan to be flying in any weather colder than 40 in the winter, and up to about 100 in the summer.Can I have a few opinions on this?
Thanks -
Jimmy Young
Houston, TX
FS II
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R. Hankins
Joined: 18 Jan 2006
Posts: 185
Location: Grants Pass, Oregon
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| Posted: Sat Nov 24, 2007 10:33 am Post subject: Re: question on carb jet needle settings |
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If your EGTs are still below 1150, there is no need to change. As long as your engine instruments are accurate, let them make the decision for you. If your EGT's get to high in the cooler air, raise your needles one notch. If they don't, leave them alone.
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Roger in Oregon
1992 KXP 503 - N1782C |
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agustafson(at)chartermi.n
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| Posted: Sat Nov 24, 2007 11:07 am Post subject: question on carb jet needle settings |
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Just watch the EGT temps. If in the cooler weather the temp starts going above where you feel it should, raise the needle a notch. When I flew my FS 2 with 447, I would fly down to about 10 F and would need to adjust spring and fall. 40 F may not need a needle change.
Aaron G.
[quote] ---
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planecrazzzy
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| Posted: Sat Nov 24, 2007 11:39 am Post subject: Re: question on carb jet needle settings |
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Myself,
I haven't flown my FSII in cold weather....
My Notes say....Raise the needle "one" notch , below 40 degrees....
( 3rd Notch from the Top )
Fer what it's worth.....
Gotta Fly...
Mike & "Jaz" in MN
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Sat Nov 24, 2007 5:27 pm Post subject: question on carb jet needle settings |
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[quote] Regarding carb jet needle adjustments: On a 503 DCDI with the Bing 54 carbs, what is the proper proceedure for jet needle adjustments to account for summer to winter air temp. drops? I've been told by some local pilots I must change the position from 1 to 2 at this time of year, or I will run too lean and can damage the engine. My plane runs great, been flying it in air temps from the mid 80's in Oct. to yesterday's 48 deg. (at) mid afternoon. I see no difference in performance, CHT, temps, or EGT's other than maybe 10 to 15 deg. cooler on yesterday's CHT's. I don't plan to be flying in any weather colder than 40 in the winter, and up to about 100 in the summer.Can I have a few opinions on this?
Thanks -
Jimmy Young
Houston, TX
FS II
Jimmy,
I have not had to change my 503 jets since I changed them on the trip to Texas this may. I flew today and the temp was 31. If there is a need to change them the cht's or egt's will tell you.
Larry C
[b]
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