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HelicopterGasser Model RC HelicoptersOther › Hovering on the High or Low needle
12-28-2009 03:53 PM  7 years agoPost 21
AceBird

rrElite Veteran

Utica, NY USA

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That is like wrapping a plastic bag around the filter element. This does choke the engine because it closes off the air to the carb and creates a large vacuum (negative pressure)drawing in fuel from ALL the ports. Like Wally says, only do it for one pull.
For what ever the reason Your theory does not seem to apply to my heli
It's not my theory. What you believe is up to you. What actually happens is another story.

Ace
What could be more fun?

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12-28-2009 04:05 PM  7 years agoPost 22
rbort

rrProfessor

Franklin, MA - USA

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Since we all agree that choking is restricting the airflow

Then doing it by closing the throttle plate to partially open, closing the choke plate fully with a hole in it for "partially open", or closing the seperate plate on the airfileter with a hole in it ALL accomplish the SAME thing!

The only difference is that the latter two are "easy". You close them all the way and the little hole is the right amount of metered air.

With the throttle plate, "learning" where to put it to accomplish the same thing makes a difference. You can have it in an incorrect place and have it take 10 pulls to start, or somewhere closer to correct and cut those pulls down to 3 to 4. That's what I mean by learning where to put it - it does make a difference - try it before you talk about it here without seeing for yourself. In my case I pull the trim back 4 clicks from idle mid trim position.

While I have not determined this for sure, having a built in choke in the carburator that is always in the airflow in front of the throttle plate may or may not affect airflow and power. If it doesn't then that's great, but just looking at it its not a clean flow with all those parts in front of the venturi...I personally prefer the choke on the outside with the stock filter if I'm going to have any choke than built into the carb.

-=>Raja.

MA 1005 Hanson 280, 4142 flts
Spectra 27 3DMax, 3210 flts
Whiplash V1 Hanson 300, 1440 flts
Whiplash V2 Hanson 300, 207 flts

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12-28-2009 06:13 PM  7 years agoPost 23
AceBird

rrElite Veteran

Utica, NY USA

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Since we all agree that choking is restricting the airflow
Choking is richening up the fuel mixture usually more than the engine can withstand when it gets warm. That is why some people use it as an engine kill switch. I have seen some of your posts suggest that.
Then doing it by closing the throttle plate to partially open, closing the choke plate fully with a hole in it for "partially open", or closing the seperate plate on the airfileter with a hole in it ALL accomplish the SAME thing!
Raja, I am going to say this once. It is not even close to the same thing. The instant you open the throttle the slightest amount you loose most of the vacuum that would develop if it were closed. Secondly, you are only exposing 1/2 a hole. A choke supplies fuel from all the ports, even the high. With your method you could pull it for an hour and never get the plug wet. How could you ever idle any engine if your principle actually richened the mixture? If it makes you happy to do this, then have at it but in no way does it simulate a choke.

On a cold start in the winter if you tried to use the same principal for a snow blower your arm would fall off before you get it started by the cord. Whereas with a properly tuned snow blower you can start them with the same two pulls you use on your heli with a choke.

Ace
What could be more fun?

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12-28-2009 06:22 PM  7 years agoPost 24
C.A.P.

rrApprentice

custer park IL.

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The is no restriction from a choke built in a carb, like the 644, Just look at a 643 and the 644 carb, You will see the front opening on the 644 is much larger then the 643, this is engineered to let more air in, because of the space the choke displaces, So there is no restrictive forces there, Walbro is not a dumb company, they are the best in carbs for small engines,[list]

[And I do agree with Raja using the throttle does work, but, it in no sense, Is it choking, It does give him credit for having his needle tune right, Which is a must, And if you use the 644 you never have to learn anything just choke and go, Walbro has found this out, and is changing the carbs to all have chokes, Wally

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HelicopterGasser Model RC HelicoptersOther › Hovering on the High or Low needle
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