Quote:
Originally Posted by Nathan jones
Just a quick question, I plan to remove my backbox and make a titanium exhaust with two resonators, does anyone know if this although noisier result in less dirty air in the compression stroke of the Atkinson like it does in Otto cycle engines?
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Engine tuning often relies on valve overlap and exhaust back pressure to push exhaust gases back into the cylinder - it's a design feature, not a bug. Any exhaust gases that end up going back in displace fresh air and reduce pumping losses. It's both an economy and an emissions feature.