Back when I was getting my 67.5 1600 back on the road, I bought some SUs
from Ross at Sports Imports, and he set me up with a different needle
because he knew that Albuquerque is 5000 feet. But I don't remember which
needle???
Robert - 67.5 1600 - Albuquerque
www.ziaroc.com
-----Original Message-----
From: owner-datsun-roadsters@Autox.Team.Net
[mailto:owner-datsun-roadsters@Autox.Team.Net] On Behalf Of
Keith0alan@aol.com
Sent: Tuesday, October 19, 2004 2:24 PM
To: dgstoll@gwi.net; datsun-roadsters@Autox.Team.Net
Subject: Re: altitude affect on SU Carbs
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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