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Engineering/Technical Ask technical questions about cars. Do you know how a car engine works?
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Old 05-30-2006, 03:42 PM   #1
71 cuda'
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bore question?

hi, when you bore your engine .20 over does that mean 2mm? and like .30 over is that 3mm more?
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Old 06-01-2006, 08:32 PM   #2
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Re: bore question?

No. you are confusing metric and English measurements.

.020 means the bore (diameter) increases by 2/100ths of an inch. This means that only 1/100ths of an inch of metal is removed from the cylinder wall itself.

Overbores are measured in metric as well. a 0.75mm overbore is approximately equal to a .040 inch overbore.
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Old 06-02-2006, 08:49 AM   #3
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Re: bore question?

Close... One millimeter is .0394". A piston marked ".5" means about .020" over. .75, .030", and so on.

Older (American) cars are entirely "inch" system. In the late '70s, there was a trend to "metricize" American products. While it worked with manufacturers, it has not yet taken "hold" in the aftermarket. A shop like ours uses "standard" measuring devices and "converts" metric. A couple more generations, and we (USA) will be completely "metric". Dinosaurs like myself will be either dead and gone, or "retired'... (:-

If you want to talk "muscle cars", you must be fully versed in "inches". The only true muscle car to use the metric system entirely, is the current version of GTO.

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