['Air Programs']

['Mobile Emission Sources']

09/05/2023

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§205.153 Engine displacement.

...

§205.153 Engine displacement.

RegSense CFR Regulations Environmental Protection Agency (EPA)Mobile Emission Sources Air Programs Environmental Air Quality CFR Section English Focus Area USA

(a) Engine displacement must be calculated using nominal engine values and rounded to the nearest whole cubic centimeter, in accordance with American Society for Testing Materials (ASTM) E 29-67.

(b) For rotary engines, displacement means the maximum volume of a combustion chamber between two rotor tip seals minus the minimum volume of that combustion chamber between those two rotor seals times three times the number of rotors.

cc = (Maximum chamber volume?minimum chamber volume) × 3 × number of rotors.

['Air Programs']

['Mobile Emission Sources']

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