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By adding which of the following material to aluminum alloy piston slap can be avoided?(a) Silicon(b) Zinc(c) Copper(d) LeadThis question was posed to me during an online interview.My question is from Engine Components in section Basic Engine Components of Automotive Engine Design

Answer»

Right choice is (a) Silicon

Easiest explanation: The material added to the piston to avoid piston slap is silicon. The other ADVANTAGE of adding silicon is the piston becomes harder and thus less liable to SCUFFING and wear. HOWEVER, higher silicon CONTENT can also make the alloy brittle which leads to piston developing cracks if the detonation or pre-ignition OCCURS.



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