Approximate Progression Of Cylinder Liner Finish On Detroit Diesel Engines - Engine Builder Magazine
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Approximate Progression Of Cylinder Liner Finish On Detroit Diesel Engines

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The following is a very approximate progression of the various finishes that have been used on Detroit Diesel 2-cycle engines over the years by a variety of manufacturers, and our opinion of the results. There are other factors

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and measurements other than RA finish; this is intended only as a comparison of the thinking through the years.

1940’s: Crosshatch was peaked honed to around 35RA.

  • Many low HP applications.
  • Crosshatch worked ok until 60’s when HP increased.

 

1970’s: Crosshatch was peaked honed to around 60-70RA.

  • This was an attempt to seat the fire rings and reduce the ring scuffing and port clipping caused by the
  • increased horsepower. Engines tended to slobber oil until the oil rings broke in if ever.
  • Many combinations of oil rings and fire rings were used over the years to help the slobbering problem.

1980’s: Plateau honing came into the mix using a rougher RA but a deeper R3Z pattern.

  • In many applications the fire and compression rings now would not seat, causing high base pressures, forcing oil out the air box drains.

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1990’s: Brush honing was the next attempt.

  • However the surface may still have been too aggressive for the sensitive oil ring scrappers and added to the problem of seating the fire and compression rings.
  • This may have contributed to the excessive slobbering until the oil rings wore themselves in, if ever.

1999: IPD introduces an innovative “Two-Stage” Honing Pattern

This technique utilizes the best of the patterns used:

  • Rougher finish above the ports to seat the compression and fire rings.
  • Smoother R3Z finish below the ports to reduce damage to the oil ring edges.
  • Standard OEM run-in procedures are required to experience Reliability and Durability with the innovative IPD liner.

Tech Tip courtesy of IPD.

 

 Additional Tech Tips>>  

 

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