Join Date: 04-16-2019
Location: Worcester, England
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Re: 954 big bore kit
Hi, I am not a scientist, but doesn't a larger bore DECREASE the compression ratio?
My reasoning is this: There is a greater cylinder volume, but still the same amount of air/fuel flowing into the chamber. Using the same domed pistons and same size valves means that you now have the same volume of air/fuel being compressed in a larger space. That, to me, gives the effect of 'diluting' the mixture with the consequent LOSS of compression.
2018 CBR1000RR SP2 / 2004 CBR1000RR / 2003 CBR954RR / 2001 CBR929RR (Erion Racing Edition)
1985 Honda VF1000R / 1985 Honda NS400R
2007 MV F4 1000R / 2020 Daytona 765 Moto 2 Replica (on order)