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John,
I also didn't like the failure mode of the smog pump, although I flew
with one for 60 hr with no problems in my RV6A with a 1986 13B NA. Last
summer I removed the smog pump and the rest of the vacuum system. The
idler I used was an alternator. The info on the box was:
14-684
Alt 12V DENSO
55 amp unit
85-89 Chevy, Geo
36-14684
This alternator fit in the same space as the smog pump and I made an
adapter to use the smog pump pulley on it. The same mounting points on
the engine were used, requiring just a couple of spacers to accommodate
the different mounting width. Having a second alternator made me
comfortable eliminating the second battery. In my case, the net weight
change by eliminating the vacuum system and second battery and adding
the second alternator and a Dynon D10A was a decrease of 24 lb.
Something to consider if you are so inclined.
Steve Boese
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