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49-8 N sputters, but a quick pull of the choke clears it up

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Steve SA

11-02-2002 05:11:36




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While taking folks on the hayride the other night, even after old Nellie was warmed up she would begin to sputter at times. I would do a quick pull of the choke and she would straighten up. Then she would do it again. Any suggestions as to what to look at first? Thank you ahead of time for your responses.




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duey

11-02-2002 16:16:34




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 Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to Steve SA, 11-02-2002 05:11:36  
Carb icing.... interesting phenomenon....very real, too. Aircraft accident investigations usually include a good look at the plugs... black and sooty is one of the marks of carb icing.... The temperature of the fuel/air mix can drop as much as 100 degrees as it passes through the carb. That will frost up the smallest amount of moisture. This may not have been your trouble, hard to say. On the flip side, taking air that has been heated up by the manifold cost alot of power, it loses it's density. Just the facts of life with a carburetor....fuel injection can improve things.

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raytasch

11-02-2002 05:24:27




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 Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to Steve SA, 11-02-2002 05:11:36  
Steve, Look for a diminished fuel flow to the carb. If you are getting a steady full stream fuel flow at the carb clean the carb. You have a filter in the tank at the shut off valve, another screen in the fuel bowl. Also check the vent in the dome at top of fuel tank.
ray



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raytasch

11-02-2002 05:26:54




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 Re: Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to raytasch, 11-02-2002 05:24:27  
Forgot, don't overlook carb icing as a posibility.
ray



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curious for 30 yrs ... Les, TN

11-02-2002 06:05:34




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 Re: Re: Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to raytasch, 11-02-2002 05:26:54  
Carb icing? That's an interesting notion. Seem's like I recall something from Pilot's 101 about carb icing. Doesn't that require certain ambient conditions? Air temp to be so many degrees from dewpoint; relative humidity to be xxx??; fuel to evaporate (i.e. absorb heat) at such-n-such a rate, and etc. Guess I'd never thought about it much in a normally aspirated gasoline engine.

My vote's for no fuel flow through the system. My Toyota PU does that when the fuel filter gets plugged. Check your filters-n-screens. Drain your carb bowl.

If a little choke fixes it, you may also have an intake vacuum leak. Check your bolts for tightness.

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Dell (WA)

11-02-2002 08:02:49




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 Re: Re: Re: Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to curious for 30 yrs ... Les, TN, 11-02-2002 06:05:34  
Les..... ..in early 50's, was going thru New Mexico mountains to Albuquerque and the engine on '49 Ford V-8 quit running. Opened the hood to find a white frosty aircleaner and carb and intake manifold. WHAT TA'HLL? Dang cold dry empty desert, no help on reservation, 1/2 hr later engine heat had melted frost and engine started. Sure impressed this teenager..... .Dell



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Dell, Brrrrr . . . Les,TN

11-02-2002 19:58:07




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 Re: Re: Re: Re: Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to Dell (WA), 11-02-2002 08:02:49  
Not fightin' with ya bud, just ruminatin'. It's obvious that carb icing can occur (it did for you) but if I recall c'rectly there's some relationship between temperature and dewpoint (like gotta be within 3-4� of each other) for old Bernouli to work his magik, with the most common being when the temp is in the range of 60-80�F. Most of the time for us terrestrials we don't worry bout that. If the putter stops runnin we just glide to a stop.

I'm just remembering that little Cessna 150 on landing approach. Ifn ya didn't put on a little carb heat you could wind up a little short of the runway. I was flying in central FL at the time and she'd sputter a bit practically every time ya pulled on the heat (especially if you were a little late doing it) while the carb ice cleared.

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Steve SA

11-02-2002 05:29:13




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 Re: Re: Re: 49-8 N sputters, but a quick pull of the choke clears it up in reply to raytasch, 11-02-2002 05:26:54  
Thanks for such a quick response. That is quite helpful. You guys are amazing. Steve SA



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