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Ratios in the hp1200 motors

the new and upcoming 1200hp in the thruxton rs has a listed 12.0 compression ratio

the thruxton r has 11.0 versus the standard ht1200 making 10.0 compression

I’m curious if it’s in the chamber volume on the heads or if the motors piston assembly is different

does any one know before I start looking at part numbers
 

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Ratios in the hp1200 motors

the new and upcoming 1200hp in the thruxton rs has a listed 12.0 compression ratio

the thruxton r has 11.0 versus the standard ht1200 making 10.0 compression

I’m curious if it’s in the chamber volume on the heads or if the motors piston assembly is different

does any one know before I start looking at part numbers
The TFC's run the higher compression they were the fore runner for the new RS , the pistons are different as is the head .
 
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