As far as I know, the IO-550-N has always had a TBO of 2,000 hours. Other
IO-550 models, like the IO-550-F, still have a 1,700 hour TBO. That tricky
suffix means a lot. Two IO-550's with different suffixes could have
different cases, cylinders, etc. TCM's numbering scheme leaves a lot to be
desired.

-Mike

"Tom Sixkiller" wrote in message
...

"C J Campbell" wrote in message
...


The TBO for the Continental IO-550-N used in the SR22 is 2000 hours,
not
1700 hours. See http://www.tcmlink.com/producthighlights/ENGTBL.PDF.

It's changed in the past ten years...the IO-550 in the F33A is TBO'd at
1700.