tarmac rally - race

Audi AEB, AWT turbo engines

I-4cyl 1.8L 20v DOHC (DTH/DTH)

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225hp engines have an extra lower shim of 0.6mm at the exhaust spring due to higher turbo pressure. The maximum allowed lift when using the std spring setup is reduced to 9.4mm! It is required to modify the spring setup in this case.

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- chilled cast iron camshafts

- supplied with adjustable chain sprocket on the exhaust cam to optimize intake cam timing

(also available with 2 non adjustable chain sprockets at reference cam timing: partnumber 10156xx hydraulic or 10157xx mechanical)

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ONLY for dirt track applications and pro street use with adjustable engine management or carburettors

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The center intake valve is most critical for piston clearance. The distance between valve and piston should be 1.0mm at least:

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check 5-15° after TDC on intake

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check 5-15° before TDC on exhaust

If a VVT tensioner is used, the piston clearance should be checked at full advance.

Machine pistons if required. Wrong installation can cause severe engine damage!