Andy,
I guess no body wants to hear your mesaage. Yes it is the same engine. The Evolutin turns the Mejzlik 24x10 with the MVVS designed cannister exhaust at 6900 to 7000 rpm right out of the box. The Bisson exhaust on the same engine with the same prop reads 6600 rpm. Fuel and oil make very little difference. The weather does have an impact on rpm readings however.

When there are statements such as the one regarding the difference in the ignition it shows me that the person has not even taken a look at the Evolution 58 so how can he quote RPM numbers! Same thing regarding the bearings, someone is following another agenda here.

To have a real "Tach" contest is first of all sort of rediculous but secondly needs to be done exactly side by side, same day, same prop, same exhaust, same fuel. Second hand information is never a good thing to quote as it commonly makes a person look foolish in the end.

Good flying, (that is what it is really about!)
Jimnie