how to work out compression ratio

[pug106turbo]

hi there i know you have to lower compression but how do you work out to lower it to correct ratio

[Simo]

Its something that i've been meaning to work out the calculation for the saxo's for a while now.. (might get around to doing it)



Most people would tell you to titrate a liquid into the cylinders... but I cant see many people bothering to do that... or even knowing how to use a burette. <img src= "smileys/silly.gif">



If you know, or can grab a few values fom a haynes or workshop manual you can calculate it...



Here's a link you may find useful??



Compression ratio calculation ("")

[pug106turbo]

cheers



Hows is your compression lowered

[Simo]

Two 2mm gaskets.

[pug106turbo]

Where did you buy them from or are they special ones

[Simo]

STd from citroen.... not sure what material the gaskets for your engine are made from though?

[pug106turbo]

well am putting mk1 rallye head on so what head gaskets would i use then

[Simo]

I don't suppose you have the relevent formula written down on the back of a fag packet do you John? (Axsaxoman)

[axsaxoman]

yep

cr=cv+ccv devided by ccv

cv=cylinder volume

ccv= combustion chamber volume

don,t forget to calculate volume in gasket and add to both

[axsaxoman]

Oh and this presumes pistons are level with top of block,

if not you must add or subtract any ups and owns in piston shape