I, too have been trying to figure this out. I feel the “L"bracket is
heavy and cumbersome - inelegant to say the least. Modern engineering
makes possible this experiment. I feel a small alternator placed
where the generator is on the S1 3.8
E-Type is workable even possibly using the same adjustment bracket,
but fashioning a new mounting bracket and using XJ6 SIII adjuster
units and mounts for the compressor, etc. The closest CHEAP solution
I have found is a Lucas '70s MGB alternator of about 65 amps or so.
It is JUST barely too large. The ideal alternator is about 3.5”
diameter (3.8 generator size IIRC) and the Lucas is 4" IIRC. Perhaps
with a slight amount of engine lifting by shimming the front mounts a
bit enough working clearance can be had. The bugbears here are the
(left hand drive) frame rails and the steering shaft, small though it
is. The alternator you refer to I did not know existed, and it is
expensive as you say. Someone makes a modern alternator in a
generator case so it fits nicely, but it, too is expensive ($350 or
so I think).
There are probably several Sanden AC compressors that would suffice
as it would consequently mount where the current Alternator is on my
66 S1 FHC where there seems to be plenty of room. The rest seems easy
by comparison, but I haven’t gotten much farther than to be stymied
by the Alternator conundrum. Several listers have added or upgraded
their AC, but I know of no one who has done what you and I propose.
I look forward to hearing from the rest of the list and from you and
in seeing the pictures of your progress and final results.
best regards, Brian