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Thread: Engine break in procedure C85 Stroker

  1. #1

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    Engine break in procedure C85 Stroker

    Hi all, my J3 is almost ready to get back in the skies. I have overhauled my C85 and done the stroker upgrade and was wondering what every one recommends as a engine break in procedure? I have previously broken in 0320's with a high power setting two hour run at close to sea level, I am a bit concerned that my standard J3 only has just over 2hrs endurance by my calculations and was wondering what everyone else had done?
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  2. #2

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    I just flew mine normally, which is to say, the pattern. I am now at 250 hours with no mishaps save a piece of dirt under the relief valve at ten hours, and I burn a quart every twelve hours. I did use mineral oil for the first 25 hours.
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    cubdriver2's Avatar
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    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
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  4. #4

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    Finally got her up and running! I flew around the area for a while at full throttle but the temps crept past the 200 degree mark on my oil temp gauge and I got worried so throttled back and cooled her down a bit. How hot would you be happy to let the oil get and for how long?

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    skywagon8a's Avatar
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    See NOTE 1: https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/73e923a0d5faef7e8525670e004526a4/$FILE/E-233.pdf

    Oil temperature maximum limit is 225°F. The temperature is likely to come down a bit after the engine is broken in.

    This is a good article on the subject: https://generalaviationnews.com/2018...rature-engine/
    N1PA

  6. #6

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    The trick is to run it hard enough to break the rings in, but not too hard that you overheat the engine and glaze the cylinders if they are chrome.
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    Thanks very much!

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    algonquin's Avatar
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    Look for a Lycoming SB on breaking in engines. They give you a complete program on breaking in.

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    algonquin's Avatar
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    Service instruction 1427C engine break in from Lycoming

  10. #10

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    Continental says the green arc goes to 225, and you can operate there without damage. Why it gets that hot might be a different story.
    Why would a Lycoming break-in procedure be better than Continental? Smarter engineers? More experience?

  11. #11

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    Thanks Guys, I appreciate the help

  12. #12
    Crash, Jr.'s Avatar
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    Quote Originally Posted by skywagon8a View Post
    Oil temperature maximum limit is 225°F. The temperature is likely to come down a bit after the engine is broken in.
    My engine must be really broken in since it won't ever get above 140 degrees oil temp. I'm always amazed to see a J3 that actually makes good oil temp.

  13. #13

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    I am running three, and fly others. On a 70 degree day I expect around 180 degrees on what appear to be good gauges. When it hits 100 I expect 210 on the gauge.
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