Oracle, mate,
Lycoming 540 .474
A turbonormalized Continental 520 or 550 (8.5:1 compression) running Gami injectors and lean of peak cruises with a BSFC of .39 to .41 according to TAT data.
Rotax Carby .45
0.474, well I can make any of the run that way too......but I think you will find the Lyco is in the 0.40 range as well. Do your numbers on real data. You know what I mean
I just did.
Confucius say; Don't tell a man something impossible when he already doing it!
Where the rotax engine wins is reliability longevity and ease/cost of maintenance
I agree they are a great little power plant, no doubt, but $$per HP I am not convinced, the Lyc 540's are 3+ times the HP and not costing more than 3 times the $$, so could be a tough argument.
Major thread drift here.