Vacuum pump salesmen! nope, sorry I don't, but I'll add the question to
my list. I wonder if it could be that the fuel pump and the oil pump needs
to turn faster? do they? dunno, good research project.
Jim

"Dave Butler" wrote in message
news:1145999840.940424@sj-nntpcache-3...
Jim Burns wrote:
Different gear ratio.... Lycoming 6 cylinders typicaly run a ratio of
1.3 :
1, so 700 hours is the most you should expect. Pretty good article on
the
sacramento sky ranch site.

Thanks, Jim. I didn't find the article on the SSR site, but I believe you.
Do
you know what the rationale is for making the accessory shaft spin faster
on 6s?

Dave