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Stock VW/Audi Component Configurations PDF Print E-mail
Written by Stuart Brown   
Monday, 05 November 2007 22:06
  • Stock rods and pistons, with 2 metal head gaskets (ABF), will lower the compression by approx 1 point (e.g. from 10.5:1 -> 9.5:1)
  • Stock rods and pistons, with spacer gasket , will lower compression by approx 1.5 points
  • For the short-block 1.8 litre engines only, stock rods with 81mm Audi ADU/3B/AAN/ABY/RR (S2) pistons yields approximately 9:1 compression ratio with the 5cc dish of the piston. Pistons are forged and will take a lot of abuse before melting, possibly due to their large top-land area
  • For the tall-block 2.0 litre engine only, stock rods and 2.0-8V pistons (e.g. 2E, AGG, ABA, ABT, etc), yielding a compression of approximately 8:1 compression due to their large 16cc dish. Some valve clearance MAY be required. Some more modern 2.0-20v pistons (e.g. Audi A4) MAY need machining to reduce the compression height, in addition to adding valve reliefs
  • For the tall-block 2.0 litre engine only, stock rods rebushed to accept 9A/6A pistons (which use 20mm pins), yielding a compression of approximately 9:1, and maintaining good 'squish' compared to the 2.0-8V pistons above.
  • 2E or ABA tall-block 2.0 litre 8v with 9A/6A intermediate shaft and pulley, crank pulley and oil pump, yields approximately 8:1 compression due to their large 16cc dish. Again some valve clearenceing may be required.
  • For the 1.8 litre engines only, stock rods (or 1.8T rods) with modern 81mm 1.8T 20 valve pistons. Must check piston to valve clearances after assembly.
    • Last Updated on Tuesday, 10 June 2008 19:16