Why we bore and use oversized pistons?

ZMann · May 30, 2016

to a 020 for example, Do we do it to gain more power or because of too much wear?

If the former, How much power to you get in a 300 TDI by moving up to a 20 or 40?

Thank you,

Z

raywin · May 30, 2016

Re bores are almost always done to engines which have excessive wear. Allows the bores to made round and consistent again. The gain from increasing the bores and pistons by. 020" would be nominal.

jamesmartin · May 30, 2016

as above , wear and removal of poor surface,to give you an idea a 3.9 is larger by 200 thou compared to a 3.5

ZMann · May 30, 2016

Thank you

Why we bore and use oversized pistons?

ZMann

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raywin

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jamesmartin

Well-Known Member

ZMann

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