Comp Ratio someone confirm my numbers please

StrokerScamp said

I understand that......and I wasn't tryin to argue....what I was trying to figure out is, if the two ways are BOTH correct, why are they coming up with two entierly different compression ratios? I guess I shouldda included all that, too. LOL sorry bout that. SUMTHIN has gotta be wrong somewhere. whether it's the caulculator, us humans enterin info backwards or sumthin.

Click to expand...

Don't know why the two calculators are constructed that way. The one I used (http://www.csgnetwork.com/compcalc.html) could have been as simple as a dome is plus because it adds materials to the piston where a dish is negative because it subtracts material. Where the KB calculator is looking at it from the cylinder standpoint; a dome is negative because it subtracts chamber volume where a dish is positive because it adds to the chamber volume.

To write the formulas either way is a simple algebra manipulation. Remember (+3) times (+2) = (+6) and (-3) times (-2) = (+6). So just have the right signs in the equation in the right place will make either give you the correct answer.

If you understand what you are calculating and the calcultor does not state how to enter numbers you will knwo from looking at them which is correct.

For anyone that is so inclined to calculate their cpompression ratio withou the aid of a program here is the formula.