Quote:
Originally Posted by Q-ship
Everything Darin told you is how piston aircraft engines are broken in......load them up and firewall them on take off. Think about it, do the engine builders baby an engine on a dyno for a equvilant of 500 to 1000 miles or do they do a 30 minute run to seat the rings and set a wear pattern in the cam, after that they beat the living piss out of them. If the manufactures get you to baby it for 1000 miles that is 1000 miles of not really hard driving, and how many of us after the break in drive a car hard? It is all about saving money on warrenty costs.
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Excellent points and scenario where a normal hard-load break in is the norm. I did the jugs on my Dads A0550 in his Bonanza. We put in a cam and some other intake work. That thing climbs out like a rocket ship and cruises at 205mph. It was also broke in by fire walling it and climbing out under full load. Aircraft engine really need LOAD due to the massive ring surface area and ring/cylinder wall metallurgy. You dont break those in HARD and you have an engine that uses a massive amount of oil due to the fat that the rings will never seat.