Bax
Posts: 12457
Joined: 4/26/2002
From: Champaign,
IL, USA
Status: offline
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The breakin of an engine is determined by its materials, its type, and how precisely it's made.
Years ago, model engines tended to be more sloppy in fit, and needed considerable running until they worked well and developed the power they should. Lapped engines, with the steel alloy piston running in a steel liner could require considerable running time until they would be able to maintain running near their intended peak.
Ringed engines, with the "springyness" of the ring never required the running time of a lapped engine, but they still need some time to allow the part to fit together better. The tighter the production tolerances of the parts, the less time needed. However, model engines are usually not made with the precision of some of the automotive racing engines. You're also not paying "racing engine" prices.
Some breakin is good because you want all of the parts to start fitting together. During this process, a bit of extra oil helps to carry away any eroded metal products and helps a tad in the cooling. As the parts wear together, the engine will be able to accept running closer and closer to its peak RPM. I've seen engines that would take over an hour's worth of running until they'd accept being leaned enough that the engine could develop enough power to fly. Other engines do well right out of the box.
Another good reason for spending some time running the engine, in effect breaking it in, is to get thoroughly familiar with it. As it's being run, you become familiar with how it's supposed to be set and how it reacts. Starting rich and "sneaking up" on the peak RPM setting is the best way to go because the engine will never be deprived of lubrication. Too lean is always a no-no, regardless of the type.
During the first few hours of running, the parts will come together and polish themselves to a good fit. That's why some engines actually deliver better performance after a bit of running time. SuperTigre engines have been a good example of this for several decades. The big 'Tigres tend to improve in performance over the first few gallons' worth of running, and then will deliver reliable power for a long time, barring accident or abuse.
There are many reasons an engine should be run for a bit before it's put into service. Your engine manufacturer should mention this in their operating instructions. They don't go by traditions or hearsay, but by sound experience with their products.
_____________________________
Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> RE: Ringed break in... 
RE: Ringed break in... - 
....good one, Brian.... 
Try telling that to some died-in the wool idle 
