"Adrian" wrote
DavidR ) gurgled happily, sounding much like

Oh, and LB can't meet the NOx regulations specified for petrol engines.

It can't... at the state of development it was left in when compulsory
cats killed it.

NOx is a function of heating the air, not a combustion product. How do you
lower temperature and keep efficient?

Given LB uses excess air (more free oxygen), perhaps it makes NOx even
worse?