Please Note: The following chart applies to Power Pipes only, and will vary slightly from design to design. Many design variables apply, and the following should be used as a guide only.

Please Note: The operating lengths of Quiet Pipes are different, the operating lengths often vary from the below table, however the effects of changes in pipe length and exhaust timing are the same.,

Racing engines commonly have exhaust timings of say 175 to 195 degrees.

Other high performance engines (ducted fans or free flight etc), have timings of say 160 to 175 degrees.

‘Normal’ engines have timings of 145 to 160 degrees.

Engines below 140 - 145 degrees are often difficult to operate correctly on a pipe.

Exhaust timing in degrees