"I’ve been on the Dyno with the 75 and the old 3.9 (about 30 hours on the track) and did over 80 powerruns those days. Always to the RPM limit of 9100. Power max at 8700.
I have treated this engine always to the limit. For tests up to 9500 Rpm‘s for short times.
When i started doing the Busso engines 25Years ago the experienced people of those engines told me 7800 is the max for this engine... check out how the crank looks after those high rpms and a bore of 103mm...... everything perfect...getting wet eyes while watching..😄for me a great experience.
And i can see out of those results that this engine is good for 10000Rpms if everything works perfect together.
We will do it soon😊 ForzaAlfa"