quick displacement calculation question...

UP2MTNS · 06-19-2008, 07:33 PM

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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Homemade WRX · 06-19-2008, 07:51 PM

well you will be closer to 2500cc's than the factory 2457cc

it'll be 2482cc

bluescoobywagon · 06-20-2008, 12:09 PM

Displacement is calculated using bore and stroke. The gaskets and chamber come into play when you calculate compression ratio.

UP2MTNS · 06-20-2008, 03:17 PM

Quote:

Originally Posted by Homemade WRX

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.

kellygnsd · 06-20-2008, 05:02 PM

Quote:

Originally Posted by UP2MTNS

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.

06-19-2008, 07:33 PM	#1
UP2MTNS Scooby Specialist Member#: 112405 Join Date: Apr 2006 Chapter/Region: BAIC Location: San Francisco Vehicle: 2004 WRX Rally Car Silver, Black, and Decals	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! * Registered users of the site do not see these ads.

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06-19-2008, 07:51 PM	#2
Homemade WRX Scooby Guru Member#: 33782 Join Date: Mar 2003 Chapter/Region: MAIC Location: 3MI Racing LLC Vehicle: 96 bastard child search FIRST, then PM!!!	well you will be closer to 2500cc's than the factory 2457cc it'll be 2482cc

06-20-2008, 12:09 PM	#3
bluescoobywagon Scooby Specialist Member#: 14911 Join Date: Feb 2002 Chapter/Region: MWSOC Location: The land of E85 Vehicle: Not A Wagon! 2011 WRX - 285s on 18x10s	Displacement is calculated using bore and stroke. The gaskets and chamber come into play when you calculate compression ratio.