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What is a Reboring allowance?

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in Automotive Engine Design by (137k points)
What is a Reboring allowance?

(a) It is the clearance between piston and cylinder

(b) It is the additional metal thickness

(c) It is the standard number to rebore

(d) It is the allowance for the moment of the piston

The question was asked by my college professor while I was bunking the class.

Question is taken from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

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The correct option is (b) It is the additional metal thickness

The best explanation: Reboring allowance is the additional metal thickness that is required to withstand maximum gas pressure. Also, when the cylinder wears out based on the availability of piston size the cylinder can be rebored.

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