How to polish a combustion chamber

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The invention of hemispherical heads in 1901 marked the beginning of understanding the fluid dynamics of an explosion of gasoline in a combustion chamber. A golden age of racing cars the 1950s, it was standard practice for do-it-yourself car and motorcycle manufacturers, at least polished heads cast iron sand are, in practice, the combustion chamber. Just as it was then polishing heads is a long and quiet task.

Things that need

  • Degreasing solvent
  • Rags
  • Tablet (store) awl
  • Hand grinder rotary
  • Air Assortment
  • Mechanic 80 grit abrasive rolls
  • Assorted Rotary Tool Polishing Wheels
  • Metal Mandrells various lengths
  • Polishing compound


  1. Remove the cylinder head or heads. Clean the heads with degreasing solvent and rags. Blow dry with shop air heads or other source of compressed air.
  2. Place a new head gasket at the bottom of each head. Scribe the outline of the board in the bottom of the head or heads using a mechanical punch. Remove the gasket. Just fingernails within those lines.
  3. Insert the shortest possible time Mandrell head of a rotary quern, following the instructions that come with your mill. The Mandrell is the rod that connects the body to the abrasive grinder rollers. Connect an abrasive roll to Mandrell.
  4. Place the cylinder head or heads on a flat surface. Soften the sharp edges of the intake ports and exhaust rotary grinder and an abrasive cylinder. In most of the original engine, these ports are 90 degrees and can be hard or chopped.
  5. Grind all flat rough surfaces in the intake and exhaust valves using a rotary mill and grinding rolls. Abrasive rolls come as fat and lean cylinders, cones, wheels and other shapes. Change mandrells and abrasive cylinders for better reach within ports as needed.
  6. Grind all the hard flat surfaces within the combustion chamber, except the seats of intake and exhaust using a rotary mill, abrasive rolls.
  7. Polish all land areas within ports (excluding valve seats) and the combustion chamber with a rotary tool, rotary buffing wheels and polishing compounds tools.
  8. Clean all debris from the heads and solvent degreasing trapos.
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