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Old 06-19-2008, 08:33 PM   #1
UP2MTNS
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Join Date: Apr 2006
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2004 WRX Rally Car
Silver, Black, and Decals

Default quick displacement calculation question...

STI block bored out to 100mm
hybrid build, WRX heads w/Cosworth stock thickness gasket
supertech pistons, custom ordered for 8.2:1 CR

is my displacement still 2.5L? or slightly more?

TIA!
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Old 06-19-2008, 08:51 PM   #2
Homemade WRX
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well you will be closer to 2500cc's than the factory 2457cc

it'll be 2482cc
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Old 06-20-2008, 01:09 PM   #3
bluescoobywagon
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Displacement is calculated using bore and stroke. The gaskets and chamber come into play when you calculate compression ratio.
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Old 06-20-2008, 04:17 PM   #4
UP2MTNS
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Quote:
Originally Posted by Homemade WRX View Post
well you will be closer to 2500cc's than the factory 2457cc

it'll be 2482cc
I did not know that! not really a 2.5L eh?

thx for the number.....a 1% increase.
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Old 06-20-2008, 06:02 PM   #5
kellygnsd
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Quote:
Originally Posted by UP2MTNS View Post
I did not know that! not really a 2.5L eh?

thx for the number.....a 1% increase.
That's pretty common actually. 600cc bikes are almost never 600cc, some lower, some higher. Unless you're going to list displacement in ci or cc they alway round.
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