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IO-520:
I have a rebuilt IO-520-BB (sort of) in my IV and have been flying for 3
years with it. I did it to have a quality rebuilt engine (Victor's), not to
save much money over an IO-550 from Lancair's price list. An IO-520 with
turbocharger will not fit because the turbo's position is below #1 cylinder,
and with the angle of the firewall, not even a close fit, way too much
engineering needed. You have to want to fiddle a bit with the installation to
make a 520 fit. No big items, standard mount, prop and exhaust. On the
positive side cruise at 200k, burning 13gph at 12,500. Cores for the 520 are
readily available.
Robert Forest N295P
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