Found a good Engine Size and Compression Calculator
Found a good Engine Size and Compression Calculator Hiya guys,
I was doing some research compression calculations and came across a rather informative site : http://www.angelfire.com/fl/procrastination/motor.html.
You basically enter your Bore, Stroke, how many cylinders (I'd imagine you all have 8 lol), Combustion Chamber volume, Piston dome (or dish) and gasket thickness. Then hit the 'Compute' button. It seem pretty accurate, but I have yet to compare it to the actual formula for figuring CR's.
My input .::.
Piston size in inches :: 3.900" (stock)
Stroke in inches :: 3.620" (stock)
Number of cylinders :: No brain(er)
Combustion Chamber in cc :: 72 cc
Piston dome in cc's :: -2.2
(Dome = positive,
Flat = 0, dished = negative number)
Gasket Thickness in inches :: 0.052''
Output .::.
Displacement :: 346"^3 (wow, didn't see that one coming) or 5.67 LI
Compression Ratio :: 9.3.....
so it seems like a pretty useful tool....
I was doing some research compression calculations and came across a rather informative site : http://www.angelfire.com/fl/procrastination/motor.html.
You basically enter your Bore, Stroke, how many cylinders (I'd imagine you all have 8 lol), Combustion Chamber volume, Piston dome (or dish) and gasket thickness. Then hit the 'Compute' button. It seem pretty accurate, but I have yet to compare it to the actual formula for figuring CR's.
My input .::.
Piston size in inches :: 3.900" (stock)
Stroke in inches :: 3.620" (stock)
Number of cylinders :: No brain(er)
Combustion Chamber in cc :: 72 cc
Piston dome in cc's :: -2.2
(Dome = positive,
Flat = 0, dished = negative number)
Gasket Thickness in inches :: 0.052''
Output .::.
Displacement :: 346"^3 (wow, didn't see that one coming) or 5.67 LI
Compression Ratio :: 9.3.....
so it seems like a pretty useful tool....
It calculates incorrectly; It's only accurate within +/- .2 points. Close enough for WAG calculations considering it's free.
Last edited by 405HP_Z06; Apr 26, 2009 at 01:27 AM.
Aaron,
If you use the same input values as your application, it is off 0.08 in compression. Much better than a WAG. If you consider the web app does not take into account gasket diameter and others, it is pretty darn close.
If you use the same input values as your application, it is off 0.08 in compression. Much better than a WAG. If you consider the web app does not take into account gasket diameter and others, it is pretty darn close.
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