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Changing Crossflow Pistons To Alter Compression Ratios
 

  

Original Engine Valve cutouts Piston Volume Standard Engine Fitted to 1300 engine Fitted to 1600 engine
1100 LC 1.55in 31cc 8.0:1 9.0:1 11.3:1
1100 HC 1.55in 26cc 9.0:1 10.2:1 11.8:1
1300LC 1.55 38cc 8.0:1 8.0:1 9.5:1
1300 HC 1.55 38cc 9.0:1 9.0:1 10.3:1
1300 GT none 21.5cc 9.2:1 9.2:1 11.0:1
1600 & GT none 30.5cc 9.2:1 8.2:1 9.2:1
Metric Engines
1100 LC 1.65in 31cc 8.0:1 9.0:1 11.3:1
1100 HC 1.65in 26cc 9.0:1 10.2:1 11.8:1
1300 LC 1.65in 38cc 8.0:1 8.0:1 9.5:1
1300 HC 1.65in 33cc 9.0:1 9.0:1 10.3:1
1300 GT 1.65in 33cc 9.0:1 9.0:1 10.3:1
1600 & GT 1.65in 37cc 9.0:1 8.0:1 9.0:1

 

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