"Do you have any idea what the internal cylinder pressures are at takeoff? Do you have any idea what the long-term issues are?"  re modified engine.

Walter, I do not know anything about internal pressures. Not my expertise so I must depend upon others.  I plan to use full power on takeoff. Once I am 500 agl is reached, reduce power for lower altitude flying and climbout and incrementally increase power as  altitude increases. Maintaining a constant reasonable manifold pressure might be a likely scenario.  Full throttle at  14,000 ft. is equivalent to 75% power at 7,500 ft. of the original configuration.  This is according to Ken at Lycon.

 

TBO?  who knows. I am 63 and have 350 hours in five years.  Using that as an average I don't think I have to worry about an overhaul except for corrosion problems. Proper pickeling in the winter, as I travel south, will go far to help alleviate that problem.

 

Ken stated, I would gain about 7,500 feet of altitude performance with the engine mods.  The new prop is an additional performance increment.

 

Bob Smiley

N94RJ