I have read a bit about how hydrogen effects combustion. I am aware that it increases flame speed, and is thus a great candidate to pair with lean burn to speed things back up and extend lean burn to even higher air/fuel ratios. I have yet to see someone actually put these two together in a car and run it though. There is also the issue with producing hydrogen onboard efficiently which I haven't seen addressed... ever. I'd like to see someone give it a shot though. If paired with variable compression, you'd have an amazing combo.
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