Altitude affects SU carbs much less than regular carbs. At Shasta when we
make the run up the mountain the SU cars just tick right along and the Solex
cars are running real rough by the time we get to the top. You can really tell
at idle. The SU cars do still run out of HP because of the lack of air but the
mixture control is better.
keith
In a message dated 10/19/2004 11:31:49 AM Pacific Daylight Time,
dgstoll@gwi.net writes:
Does the altitude affect SU carbs? The reason why I ask is that many years
ago I crossed the
country on a BMW motorcycle with CV (Bing) carbs. The CV carbs seemed to
compensate
for the different air density. The bike ran fine over the Rockies and Sierra
Nevada mountains. We
easily went past the cars belching black smoke as they chugged up the
mountains. I bought my roadster from someone in Colorado, had it shipped to
Maine at approx. 100ft above sea level and have never had to touch the carbs
in 45,000 miles of driving. My thinking is that the vacuum operated pistons
in the SUs would also be self regulating to the air density.
daveS
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