How much higher will CHTs be for a 9.6:1 engine v. 8.5:1, everything else being equal on a IO-360-A1A? Imagine you're cruising at 75%, peak power (e.g. ~50 degrees ROP on EGTs), and you have a switch on the panel that can magically toggle between the two compressions.
John Siebold
John Siebold