abv

So im trying to figure out compression ratio found a few formulas and they require some info that i dont have..

the end goal of all of this is to come up with an excell spread sheet to put all of the formuals into so gasket thickness and boost and all those other godies can be easily accounted for.

heres the info i have
AP1
bore 87mm
stroke 84mm
head volume 53cc
stock gasket thickness = .030inch

info i would like to get

1 Deck Clearance
1 Piston Head Volume

thanks once i get all this stuff up ill make a spread sheet that you can vary any of the numbers to calculate different combos...

abv

help anyone??

snakeeater

When making my spreadsheet, I had to simplify the equation to its most basic form: CR = (trapped volume + swept volume)/(trapped volume) and ignore the components you are missing that make up trapped volume. I couldn't find that data either.

But unless you are doing chamber work to the head, or changing pistons, its not necessary to know all that. The formula above will allow you to calculate trapped volume at stock CR. Then add or subtract for changes to head gasket thickness, since head gasket volume is easy to calculate (a cylinder with fixed bore and variable height).