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08-12-2012, 02:19 AM | #1 |
Scooby Newbie
Member#: 254582
Join Date: Aug 2010
Chapter/Region:
South East
Vehicle:2006 UGM WRX |
Compression ratio and quench height spreadsheet
Here is a little spreadsheet calculator that I made for calculating compression ratio and quench height mainly (or finding piston/rod/crank specs to achieve a desired cr or quench). The main reason I made this is because I got tired of re-entering values into online calculators over and over again and it allows me to compare different configurations side by side.
I know this is nothing too special, but it's a time saver for me, so I figured that maybe somebody else might find it useful. If anyone finds anything wrong or inaccurate about it, please tell me so that I can fix it. Any ideas for additions are welcome as well. Download: http://www.mediafire.com/?m3z8dxx6t3xr8b6 quick screen:
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08-12-2012, 03:10 AM | #2 |
Scooby Specialist
Member#: 316296
Join Date: Apr 2012
Location: Metro Detroit
Vehicle:2006 STIROID 10.5@131 on 29psi |
Awesome. Thanks for supplying this.
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08-12-2012, 12:12 PM | #3 |
Scooby Specialist
Member#: 165104
Join Date: Nov 2007
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SCIC
Location: Riverside CA
Vehicle:E85 SoCalPorting Owner |
Ow sweet!
Ill try it out and see how it works out. Thanks |
08-12-2012, 01:55 PM | #4 |
Scooby Specialist
Member#: 166427
Join Date: Dec 2007
Chapter/Region:
South East
Location: boynton bch, fl
Vehicle:03 wrx |
Cool stuff
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08-12-2012, 11:57 PM | #5 |
Scooby Newbie
Member#: 254582
Join Date: Aug 2010
Chapter/Region:
South East
Vehicle:2006 UGM WRX |
Thanks for the responses. Even if only one person gets some use out of it, it was worth posting lol.
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08-13-2012, 04:03 PM | #6 |
Scooby Newbie
Member#: 305707
Join Date: Jan 2012
Chapter/Region:
International
Location: AUS
Vehicle:1999 WRX WRC Blue |
Is it possible to take it a step further for dynamic compression ratio calculations?
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08-13-2012, 04:06 PM | #7 |
Scooby Newbie
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Join Date: Aug 2009
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Vehicle:2006 Impreza WRX WRC Blue |
Are you kidding me? It would be much too complicated as RPMs and Valve overlap as well as cam duration would throw a lot variables into this. This is where all the black art is. This is something you have to sort out based on what you want to do with the engine.
Jasper. |
08-13-2012, 04:16 PM | #8 |
Scooby Newbie
Member#: 305707
Join Date: Jan 2012
Chapter/Region:
International
Location: AUS
Vehicle:1999 WRX WRC Blue |
I'm trying to make sure that I get the static CR in the right range for a kelford 264. I'm thinking about 8.5:1 should be close enough but would really like to confirm.
Trouble is the Kelford cam specs are advertised @1mm valve lift and the only info I can find from Subaru at the moment is advertised duration, so in effect it says that the Kelford closes earlier which isn't helping |
08-13-2012, 07:19 PM | #9 | |
Scooby Newbie
Member#: 254582
Join Date: Aug 2010
Chapter/Region:
South East
Vehicle:2006 UGM WRX |
Quote:
Last edited by orson250; 08-13-2012 at 07:30 PM. |
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08-13-2012, 07:35 PM | #10 |
Scooby Guru
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MWSOC
Location: In the V hole!
Vehicle:2015 Stock OEM AsFu* 3.6r OMG S.C'd |
In note #4 it says use neg numbers for dome & positive for dish.
But aren't 2,0 pistons dished & 2.5 pistons domed? The numbers in the sheet show both as being dished pistons, but the 2.5 pistons have domes ,no? |
08-13-2012, 10:58 PM | #11 |
Scooby Newbie
Member#: 254582
Join Date: Aug 2010
Chapter/Region:
South East
Vehicle:2006 UGM WRX |
Any aftermarket forged piston that you will install in any forced induction subaru will be dished 99.9% of the time. But, even if you are wanting to use a domed piston in the spreadsheet, just change the value in the sheet. eg: 20cc dome piston means entering "-20" in the spreadsheet.
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07-21-2020, 11:33 AM | #12 |
Scooby Newbie
Member#: 482091
Join Date: Feb 2018
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Still works! thanks, really helped
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