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Old 01-21-2002, 09:39 PM   #1
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Default Oversized pistons, what in MM does .xx mean??

I'm trying to get the exact size of my pistons.

So what is each one in mm?

10 over?
20 over?
25 over?

You get the idea. Is there a formula I could use?

Thanks
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Old 01-21-2002, 09:51 PM   #2
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Default Re: Oversized pistons, what in MM does .xx mean?? (B18C-EJ1)

1 mm = .03939 inches
10 over = .010 inches larger
81 mm x .03939 = 3.19059 diameter in inches
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Old 01-21-2002, 10:15 PM   #3
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Default Re: Oversized pistons, what in MM does .xx mean?? (B18C-EJ1)

you can also use this formula to change mm to inches or vice versa

X (mm) divided by 25.4 = X (in inches).....i.e. 81.5mm divided by 25.4 = 3.209"

or

X (inches) times 25.4 = X (in mm).......i.e. 3.209" times 25.4 = 81.5mm
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Old 01-21-2002, 10:45 PM   #4
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Default Re: Oversized pistons, what in MM does .xx mean?? (vhd)

So, If I used 25 over pistons, they are 81.64mm?

Is that right?

81mm = 3.189
25over = 3.214

3.214= 81.64mm

I'm rounding to .xx digits.
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Old 01-21-2002, 11:00 PM   #5
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Default Re: Oversized pistons, what in MM does .xx mean?? (B18C-EJ1)

Most people that refer to 25 over mean .25mm overbore.
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Old 01-22-2002, 12:44 AM   #6
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Default Re: Oversized pistons, what in MM does .xx mean?? (sgT)

So that would make it 81.25mm?
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Old 01-22-2002, 10:17 PM   #7
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Default Re: Oversized pistons, what in MM does .xx mean?? (B18C-EJ1)

you had it right, your bore would be 3.214" or 81.63mm with the .025"/.635mm over
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Old 01-22-2002, 10:48 PM   #8
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Default Re: Oversized pistons, what in MM does .xx mean?? (B18C-EJ1)

Simply stated, .5 mm overbore equals .020 inches overbore
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