Quote Originally Posted by techinspector1 View Post
An air/fuel ratio system would seem to be necessary to me. If nobody could tell me definitively, I'd start pig rich at 140% of the gasoline jet area (.7854 x bore x bore) and lean down until I got the right mix according to the A/F gauge. Correct A/F ratio for E85 is 9.8:1
.
I've got a good Air Fuel monitor, we learned a long while back that it's about the only way to tune with E85, plug reading is about the same as plug reading a methanol engine! Takes too long to get any color on them! Works with the data logger too which is good when you're a bit busy with other things!!!! I run a bit fatter then the suggested 9.8:1 just to cover an occasional leanout.

You're absolutely correct on the AF monitor, cost me the tops of 4 pistons to learn that little lesson!!!!! IMO it's one of the two essential items when running E85 (or 90), second thing being a fuel hydrometer that works with ethanol!!!!

Thanks for the input guys!!!!