I was recently thinking about how I should rebuild my engine (O320-B2B -160 hp) when it becomes necessary. It has around 1200 hours SMOH and seems to run just fine (just keeping the fingers crossed that it will for a bit longer).
Anyway, when I filled up today ($3.28 for 100 LL with a discount) I began to think seriously about converting the 160 to a 150 at the next rebuild in order to use auto fuel under STC. I know that Pederson's has an STC for the 160 that uses 91 octane auto fuel- but I just can't find 91 octane at any of the local stations. The solution would seem to be a rebuild back to 150 hp (or rather low compression) and maybe trying to increase hp by exhaust mods or other means to get the extra 10 hp back while still being able to use 87 octane.
I know I could probably operate on the 90 octane currently available without any serious problems- I just want to stay legal (or at least compliant with the STC) for insurance reasons.
Anybody have comments on converting my B2B back to 150hp, or is it a really stupid idea?
BTW I don't operate on floats so the 10 hp difference is probably not that big a deal.