Hey guys, I posted this in another thread about someone's dyno results, and I figured it warranted starting a new thread to discuss. Anyway, I have some info that offers very good evidence for the "hard" break-in. Here's what I posted in the other thread:
I don't want to start a war here, but between Motoman's site and this quote of lycoming's
site (they make aircraft engines for the those that don't know) I think that a hard break-in is not only beneficial, but a REQUIREMENT. Now, the quote:
" There are some aircraft owners and pilots who would prefer to use low power settings for cruise during the break-in period. This is not recommended. A good break-in requires that the piston rings expand sufficiently to seat with the cylinder walls during the engine break-in period. This seating of the ring with the cylinder wall will only occur when pressures inside the cylinder are great enough to cause expansion of the piston rings. Pressures in the cylinder only become great enough for a good break-in when power settings above 65% are used.
Full power for takeoff and climb during the break-in period is not harmful; it is beneficial, although engine temperatures should be monitored closely to insure that overheating does not occur. Cruise power settings above 65%, and preferably in the 70% to 75% of rated power range should be used to achieve a good engine break-in."
And here's the clincher from their site:
"For those who still think that running the engine hard during break-in falls into the category of cruel and unusual punishment, there is one more argument for high power settings during engine break-in. The use of low power settings does not expand the piston rings enough, and a film of oil is left on the cylinder walls. The high temperatures in the combustion chamber will oxidize this oil film so that it creates a condition commonly known as glazing of the cylinder walls. When this happens, the ring break-in process stops, and excessive oil consumption frequently occurs. The bad news is that extensive glazing can only be corrected by removing the cylinders and rehoning the walls. This is expensive, and it is an expense that can be avoided by proper break in procedures."
Now, if the people that make some of the most reliable piston engines in the world say to use full power during break-in or else LOSE performance, then, by God, i'm' going to do the same. I'm sure some of you on this forum are familiar with aircraft and the rediculous reliability expected of their engines. Here's the link to the original page for those interested:
Consequently, the first thing I did on tuesday with my 0 miles ZX-10 after it warmed up was head out to the interstate and run it through the gears, and it just keeps getting stronger with 100 miles on the clock now, no oil burn or anything. I can't wait to get about 1000 or 2000 miles on it and dyno it and see the results! :)
Ok, someone argue with me