Ok, Lycoming tells me that the cam gears are the same. Same # of teeth and same pitch. Therefore, something else in the arrangement accounts for the different ratios between wide and narrow deck. I should be able to assume that I will have the same drive ratio after the cam change.
This makes sense as lots of folks have had to go to the new cam and the service instructions do not reference a change in drive ratio.
I am trying to find SI 1439 that lists the details of the cam swap. However, I can't find it on the net. Does anyone have a copy of it?
RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
Last edited by lr172 : 05-16-2018 at 07:59 AM.