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Timing questions on the 2015 R60F, R75F and R90F Novarossi Aircraft Engines

Question:  Hi I'm interested in understanding what the timing is on the 2015 Novarossi R60F, R75F and R90F engines.  I believe the Speed 13 engine has 185 degrees of exhaust timing.  Is the timing the same on the other engines?  Thank you.

 

Answer:  So, Timing on these engines is around 160 degrees.  This timing configuration provides a good compromise on performance and ease of handling.  Higher timing makes needle settings harder and pushes the requirement to only run on a tuned pipe.  Novarossi experimented with various engine timing for the engines and settled on this competitive configuration.