Tommo and All!
I have been trying to apply the 3oz-or-5oz settings for airvalve tension, and some fall right in, occasionally into the original pinning hole, when the original shaft is serviceable.
(Although there may be as many as 14 turns on an adjustor, I have been using 5 for the half-way point, to safely engage the friction pad.)
But Schebler's variations seem endless.
Just the complication of easily swapped airvalves from one carb model to another makes our forensic studies muddied. (I call it "forensic", because there is no literature.)
Attached is a pic of the four varieties of airvalve spring that I am aware of, so far,..
The far left and far right 'conical' examples are meticulous reproductions of NOS examples by FickauPrototypes@cs.com.
The middle 'beehive'-shaped examples are from an H175 and an H154. Note that only the H175 is not progressively wound.
The H175 comes quite close to 3OZ, but the H154 requires that the adjustor be screwed in all the way in, to tension down to 5OZ.
Mr. Fickau's little conical matches 3/4" models I have encountered, but I have yet to find a 1 1/4" model that will accept the very large one, without clipping turns.
Using a spring scale, and a simple calibrated rod, and a plexiglas base that I could look through,
the smallest 1" free-length 'conical' modern spring pulled to 6oz at 3/4" of compression, for a blind baseline.
The longer springs were pulled to an even 1":
The 1 3/16" long H175 'beehive' produced 3 1/4"oz;
The 1 1/4" long H154 'beehive'produce 8oz;
and the 1 7/16" modern 'conical' produced 18oz.
Perhaps the large spring was for an auto!
My immediate quandry is the H154, which must have its adjustor turned all the way in to reach down to 5oz, with its original spring.
Substituting the H175 spring proved much too light.
Is there a spring with a tension between these two?
Thanks as always,
....Cotten
I have been trying to apply the 3oz-or-5oz settings for airvalve tension, and some fall right in, occasionally into the original pinning hole, when the original shaft is serviceable.
(Although there may be as many as 14 turns on an adjustor, I have been using 5 for the half-way point, to safely engage the friction pad.)
But Schebler's variations seem endless.
Just the complication of easily swapped airvalves from one carb model to another makes our forensic studies muddied. (I call it "forensic", because there is no literature.)
Attached is a pic of the four varieties of airvalve spring that I am aware of, so far,..
The far left and far right 'conical' examples are meticulous reproductions of NOS examples by FickauPrototypes@cs.com.
The middle 'beehive'-shaped examples are from an H175 and an H154. Note that only the H175 is not progressively wound.
The H175 comes quite close to 3OZ, but the H154 requires that the adjustor be screwed in all the way in, to tension down to 5OZ.
Mr. Fickau's little conical matches 3/4" models I have encountered, but I have yet to find a 1 1/4" model that will accept the very large one, without clipping turns.
Using a spring scale, and a simple calibrated rod, and a plexiglas base that I could look through,
the smallest 1" free-length 'conical' modern spring pulled to 6oz at 3/4" of compression, for a blind baseline.
The longer springs were pulled to an even 1":
The 1 3/16" long H175 'beehive' produced 3 1/4"oz;
The 1 1/4" long H154 'beehive'produce 8oz;
and the 1 7/16" modern 'conical' produced 18oz.
Perhaps the large spring was for an auto!
My immediate quandry is the H154, which must have its adjustor turned all the way in to reach down to 5oz, with its original spring.
Substituting the H175 spring proved much too light.
Is there a spring with a tension between these two?
Thanks as always,
....Cotten
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