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Author Topic: help translate mm to cc  (Read 952 times)

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Offline gregwaits

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help translate mm to cc
« on: February 01, 2008, 07:51:51 AM »
How much of a difference does a 3mm overbore kit translate into to CCs? The bike it is for is a CB500.

I didn't do particularly well in high school math.  ;D
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Offline Patrick

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Re: help translate mm to cc
« Reply #1 on: February 01, 2008, 07:59:38 AM »
The volume of a cylinder equals the area of the base*height = ¶r2h. Pi is approximately equal to 3.14159. Since I don't know the diameter of a stock 500 cylinder I can't do the calculation for you.

Patrick

« Last Edit: February 01, 2008, 08:07:12 AM by Patrick »
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Offline bryanj

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Re: help translate mm to cc
« Reply #2 on: February 01, 2008, 07:59:52 AM »
555 ish
the formula is [(3.142*dia squared/4)*stroke]*4

Where * is multiply and / is divide( i know those keys ought to be here somewhere but I cant find em)

AND MEASUREMENTS IN CM (mm divide by 10)
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Offline ttr400

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Re: help translate mm to cc
« Reply #3 on: February 01, 2008, 08:05:14 AM »
Formula= bore x bore x stroke x 0.0007854 = Cyl cc's

Example:
Stock CB500 = 56 x 56 x 50.6 x 0.0007854 = 124.63 cc's  x 4 = 498cc
3mm over = 59 x 59 x 50.6 x 0.0007854 = 138.34 cc's x 4 = 553cc

Hope I got that correct.

Kevin
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Offline SteveD CB500F

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Re: help translate mm to cc
« Reply #4 on: February 01, 2008, 08:10:08 AM »
ttr types faster than me.

I actually make it 498.5 vs 553.4
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Offline ttr400

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Re: help translate mm to cc
« Reply #5 on: February 01, 2008, 08:13:03 AM »
Steve, 100% correct. just thought i'd round it off.

Kevin
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Offline bryanj

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Re: help translate mm to cc
« Reply #6 on: February 01, 2008, 11:35:02 AM »
Now lets stop haggling! I did say ish on the 555
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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