TUR­BOCHARGED EN­GINES

Car (South Africa) - - TECH -

The dif­fer­ence in com­par­i­son with nat­u­rally as­pi­rated en­gines is the tur­bocharger can mostly com­pen­sate for the lower at­mo­spheric pres­sure at al­ti­tude (if the im­peller is not speed lim­ited for turbo pro­tec­tion). There­fore, the in-cylin­der pres­sures dur­ing WOT is sim­i­lar to the val­ues achieved at the coast. In this case, in­creas­ing the oc­tane num­ber does re­sult in higher max­i­mum out­puts, as can be seen in the graph be­low for an Audi 1,8-litre tur­bopetrol en­gine. Cur­rent tur­bocharged ve­hi­cles have im­proved knock-con­trol strate­gies with sim­i­lar re­sults to be ex­pected.

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