Message text written by INTERNET:Eganb@aol.com
>Probably a dumb question on my part, but why are SU and Zenith-Stromberg
carburetors so complicated, compared to something like a Holley or
Rochester
carb?
I'm always amazed at all the separate components that make up the carbs you
find on LBCs, whereas a Holley four-barrel proabably has less than half the
moving parts.
<
Well, I'd have to take issue with this position. Moving parts? Maybe yes,
but parts? definately not. The fixed venturi carbs (Holley, Rochester,
Carter) all have air jets, fuel jets, and emulsion tubes - one each for
each barrel. And then there is the accelerator pump which inclueds pump
actuator, pump diaghram, spring, check balls, nozzels, etc.
Then there is the choke. This part is equally as complex as the start
circuit (enrichment device) on the Zenith with the temperature actuator,
pull-off device and butterfly. And any emission controls carb will have a
temperature compensator involved. In my 79 Mustang it wasn't part of the
carb and bolted into the side of the intake manifold but it was still there
and needs to be counted.
What the Zenith Stromberg carb gives you over the fixed venturi type is the
elimination of the idle circuit (two more jets, adjusters and springs) and
adjustability. To adjust the mixture on a Holley (excepting the idle
mixture) entails swaping out the jets and emulsion tubes. With the Z-S you
can make some adjustments over the entire range of operation.
Unfamiliar things always look more complicated than those things that are
familiar.
Just my opinion.
Dave
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