3W vs DA
10-21-2005, 04:15 PM
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3W vs DA
I thought the subject would get the moderators excited.
But I have a question.
Why do 3Ws need velocity Stacks and DAs don't.
I have owned both, and the 3Ws flew better with the stack when the DA ran well without.
But I have a question.
Why do 3Ws need velocity Stacks and DAs don't.
I have owned both, and the 3Ws flew better with the stack when the DA ran well without.
10-21-2005, 05:02 PM
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RE: 3W vs DA
Not all of the 3ws require the velocity stack or the tube into the fuse, it just depends on what kind of airflow is going around the carb in specific airframes. Also, most of the 3ws come with a tilotsen carb, which are more sensitive than the walbro that is on the DA. The DAs carb you can be close and it is fine, but on a tilotsen on a 3W, you got to be nats ass on it. I have had several 3ws run well without them, but even on the planes I dont use the intake, I run the line back in the fuse. Have had DAs that did the same thing, ran a line and fixed the problem.
10-21-2005, 05:43 PM
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RE: 3W vs DA
The 3W snorkel or fuel pump pressure diaphragm vent need is airframe or more specifically cowl/baffling model specific requirement IMO. This device or concept provides constant pressure on the atmosphere side of the fuel pump diaphragm preventing the carb from realizing ever changing static air pressure within the cowl; which acts upon the fuel delivery needs weather its required or spuriously.
I install the 3W snorkel my DA engines as well as 3W’s, in fact there is some sort of vent on all my gas engines.
I install the 3W snorkel my DA engines as well as 3W’s, in fact there is some sort of vent on all my gas engines.
10-21-2005, 07:00 PM
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RE: 3W vs DA
My DA150 had the schnorkel when i bought it used. probably need it as the Ultimates cowl lets the carb be in the airstream. i should find out soon how it works.
10-22-2005, 09:56 AM
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RE: 3W vs DA
ORIGINAL: flyinrazrback
Not all of the 3ws require the velocity stack or the tube into the fuse, it just depends on what kind of airflow is going around the carb in specific airframes. Also, most of the 3ws come with a tilotsen carb, which are more sensitive than the walbro that is on the DA. The DAs carb you can be close and it is fine, but on a tilotsen on a 3W, you got to be nats ass on it. I have had several 3ws run well without them, but even on the planes I dont use the intake, I run the line back in the fuse. Have had DAs that did the same thing, ran a line and fixed the problem.
Not all of the 3ws require the velocity stack or the tube into the fuse, it just depends on what kind of airflow is going around the carb in specific airframes. Also, most of the 3ws come with a tilotsen carb, which are more sensitive than the walbro that is on the DA. The DAs carb you can be close and it is fine, but on a tilotsen on a 3W, you got to be nats ass on it. I have had several 3ws run well without them, but even on the planes I dont use the intake, I run the line back in the fuse. Have had DAs that did the same thing, ran a line and fixed the problem.
