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Recalibrating SU Carburetters for Altitude

Recalibrating SU Carburetters for Altitude

Does anyone have a good, reliable, trustworthy XK120 mechanic in the Lakeland
area? I need the SU-6's recalibrated for sea level after living at 1300 ft
for decades.
Steve McDonald

Call James Dean in Ft. Lauderdale. He has a great old man from Argentina
that fixes and can tune your XK120 carburetors. He is currently fixing my
XK120 engine and he is good people. Recommended to him from Jaguar club in
South Florida. I hope this will help you. 1-954-524-8277, fax
Rafael Davila

BTW - our house is on a mountain at 1400 feet elevation and we live near
Burlington which is about 100 feet above sea level. We do not need to
adjust the SU's when we drive to Burlington.
Bruce Cunningham

Perhaps you Colorado and Switzerland residents can speak better to this, but I
was under the impression that the SU H-6 only needs the weaker needles at
upwards of 4000 feet (1200 meters). Steve, if you're running rough maybe it
just needs the jet adjusting screws tweaked. Maybe this is what you meant in
the first place. The manual tells how to do this, although Plate C.5 is a bit
misleading in that it points out the jet caps and calls them the adjusting
screws. The actual screws are COVERED BY the caps. If you just turn those caps
up and down you won't accomplish anything. You have to take the caps off, then
tweak the screws, then put the caps back on and be sure the cap doesn't rub on
the screw head and move it.

John, here's my numbers while I remember it:
Rob Reilly - XK120 FHC
Chassis 679187, Engine W 3962-8, Gearbox JH 7977, Body J 1187


A 1300 foot elevation change does not require immediate SU recalibration -
perhaps later  when something else needs to be adjusted, the SU base
settings can be reset.  Up to a certain point, the SU design will
automatically compensate for atmospheric pressure changes and a small
elevation change, such as 1300 feet, is exactly this.

Don't worry about the SUs, enjoy the driving !!!

Dave Quirt

58 XK150S 3.4 OTS

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