Lycoming vs Savvy / Busch for Engine Break-in

[JWJR]

Thanks for the explanation. I have not leaned that aggressively however I will.


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[M20F]

I may not have linked the most current source but this is what I have done which is varying the power.  There is nothing I have ever seen advocating a continuous power setting (75% or otherwise) for either Continental or Lycoming.  I have always seen a variable power setting. 
 
https://www.lycoming.com/sites/default/files/Lycoming Reciprocating engine Break-In and Oil Consumption.pdf

 

[FLYFST]

I think so. We installed my rebuilt IO-360-A3B6 during an annual inspection. Since a compression test is required for an annual, we did a cold compression test after installing and filling with oil and priming the oil system, but before running it. Compression was 79/80 in all four cylinders. During early flights, I never had high CHTs or a sudden drop in CHT supposedly characteristic of ring seating.
Skip

Thanks Skip


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[markgrue]

On 8/30/2021 at 6:00 PM, M20F said:

I may not have linked the most current source but this is what I have done which is varying the power.  There is nothing I have ever seen advocating a continuous power setting (75% or otherwise) for either Continental or Lycoming.  I have always seen a variable power setting. 
 
https://www.lycoming.com/sites/default/files/Lycoming Reciprocating engine Break-In and Oil Consumption.pdf

 

At cruise altitude, decrease power to approximately 75% and continue flight for 2 hours. For the second hour, do power settings alternating between 65% and 75% power as per the applicable POH.

 

The first part where it states 75 percent power is crucial.   The second hour is where you should vary the power.

 

Mark

[Pete M]

Would it help to run a high map and a lower rpm? Increase icp and reduce heat from lower rpm?

Pete

[A64Pilot]

1 hour ago, Pete M said:

Would it help to run a high map and a lower rpm? Increase icp and reduce heat from lower rpm?

Pete

I think within limits they want the heat so that the cylinder etc are at normal dimensions. But yes “lugging” a motor raises ICP, there is logic in your statement.

It is better in my opinion to control heat with mixture, just about every engine there is from automotive to aircraft go into “power enrichment” at nearly full throttle, yes it’s using more fuel but it does a lot to prevent damage, while allowing maximum power.