Ford Sierra/Sapphire/RS500 Cosworth This forum is for discussion of all things pertaining to the Ford Sierra Cosworth.

Bore size

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Old Jun 14, 2007 | 06:48 PM
  #1  
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ellicoss
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Default Bore size

What size would 91.275 bore size be ie 0.25 0.5 etc
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Old Jun 16, 2007 | 05:43 AM
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a tight .5
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Old Jun 19, 2007 | 08:47 AM
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standard bore is 90.80mm from memory, so 0.25 would be 91.05mm and 0.5 would 90.30mm..

so as said, it's a tight .5....but i'd imagine the number you have given is off the piston?? so it'll be fine.
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