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ENGINE 2.6 Bore = 6.5 cm Stroke = 6.0 cm IHV = 17.1 cc Displacement = ↓ Bore Stroke ′ ♦ σ↓ ″ ♣ψϒ♦ϒ♠τ Displacement = 199.098 cc R = IHV + Displacement IHV R = 12.643 Full Stroke Compression Ratio To calculate the Effective Compression Ratio, substitute the exhaust port height for the stroke in the Exhaust = 2.95 cm Exhaust port height 29.5 mm Eff Disp = ↓ Bore Stroke ′ ♦ Effective Displacement Eff Disp = 97.89 cc Eff Comp = IHV + Eff Disp IHV Effective Compression Ratio Eff Comp = 6.725 In order to increase the Full Stroke Compression Ratio to 13.6, how much material do you need to R = IHV + Displacement IHV You know that: , and you want to find out IHV. Displacement = 199.098 cc, and we want R = 13.6, so then IHV2 = Displacement (R -- 1) IHV2 = 15.801 cc desired IHV to have 13.6:1 Full Stroke Compression Ratio |