Sto­i­chio-what?

Wheels (Australia) - - Redline -

When there is suf­fi­cient air to com­pletely burn all of the present fuel, the air/ fuel ra­tio is termed sto­i­chio­met­ric. In petrol en­gines this is about 14.7 parts of air to one part fuel, but Mazda’s com­pres­sion ig­ni­tion en­gine can run a far leaner ra­tio ( up to 37:1) util­is­ing a su­per­charger to pile in air at lower revs. Tak­ing ad­van­tage of pre­det­o­na­tion, it also gets bet­ter econ­omy on 91 than 95RON fuel.

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