6.5L Performance Piston Kit

These start off as STD bore Mahle 6.5L pistons and are modified in a few key areas to address weak points in the stock design.

Benefits:

• Improve durability of the piston with modern heat reflective coatings
  • The goal here is to prevent hot spots and associated piston crown cracking
  • The IDI combustion process has inherent heat control issues, especially when increasing power output via more fuel over stock and holding elevated EGT levels for extended periods of time
• Reduce side loading of the piston by improving the flame travel pattern across the crown.
  • Combustion in an IDI diesel happens in the pre combustion chamber and the flame exits the pre-chamber, into the Ricardo Bowl (piston crown), from the lower edge, toward the center of the piston.
• Add valve clearance
• Reduce cylinder wear with skirt coatings
  

Power Output:

• Overall power output is still determined by how much fuel you have. These pistons alone will not add noticeable power. Rather, they support your journey of modifying a 6.5L to handle more power.
  
• These can be both a bulletproofing/durability modification and a performance modification depending on the overall build.  

Specs:

• C/R - 19.5:1 with valve reliefs for 1.7 ratio rocker arms
  • This also extends the flame pattern across more of the piston to reduce side loading forces
  • Our goal with these was to get the benefits of modifying the crowns but not reduce the compression ratio much because we can further lower C/R by utilizing thicker MLS head gaskets as follows:
    • .043 Cometic Head Gasket = 19.5:1
    • .056 Cometic Head Gasket = 18:1
    • .070 Cometic Head Gasket = 17:1
    • .076 Cometic Head Gasket = 16.7:1
• Top crown is coated with a thermal barrier to reflect heat before it soaks in
• Skirts coated with molybdenum anti scuff oil holding coating
  • This enhances the skirt's ability to hold a film of oil between the piston and the cylinder wall to reduce friction and wear
    

This Set Includes:

• 8 Pistons. STD 6.5L bore.
• 8 Wrist Pins
• 16 Pin lock rings
• 1 Set of Piston Rings to cover all 8 pistons. STD bore Size
• Coating care info sheet

THESE ARE NOT RETURNABLE so please ask any questions before purchasing.