DRD
Active VIP Member
(g/kW-hr), and oil affects the emissions also, so adding extra injection oil to get better engine life makes the engine "more dirty", and in a turbo 2-stoke there is a fair amount of loss (air/oil/fuel) through the motor when the ports are all open and the engine is under boost....this is why a 2-stroke won't make the same HP per PSI of boost as a 4-stroke....also a 2-stroke has less time to burn the air/fuel under combustion than a 4-stroke resulting in more unburnt hydrocarbons exiting the engine under boost
The question isn't if they can make a 2S cleaner than the 4S but if the can get clean enough to pass what the 'mericans deem acceptable.