Rotax 914 ignition timing

Hi

I have a fundamental question about theory of calculation of ignition timing.Especially in Rotax 912' manual stated that "in normal operation igntion occured 26° BTDC". How did they get that value?

I mean Ignition timing (26° BTDC) is not a constant stuff. Why does Rotax claim (26° BTDC) ? 

Regards

" How did get that amount? "

That Sentence needs a subject. ???

I am not sure of just what you are asking.

Please restate the question in a little more detail.

Michael wrote:

Hi

I have a fundamental question about theory of calculation of ignition timing.Especially in Rotax 912' manual stated that "in normal operation igntion occured 26° BTDC". How did they get that value?

I mean Ignition timing (26° BTDC) is not a constant stuff. Why does Rotax claim (26° BTDC) ? 

Regards

Hi Micheal,

I'm sure they got that from research and testing plus other engines. It isn't uncommon for motorcycle to be between 24-32 BTDC

Thank you Roger