Quote:

recycling the exhaust gases robs power.



The air injector is not an EGR system. It squirts some fresh air into the exhaust port during the low pressure pulse that happens just after the exhaust valve closes and inertia is still pulling the exhaust down the pipe. It could probably heat up the valve some and shorten its life though.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python