Combustion Chamber Volumes & Compression Ratios
Turbo Mini Forums

There are always lots of questions about compression ratio, combustion chamber volumes and piston dish volumes.

I've produced these simple tables to give an approximate total of the combustion chamber and piston volumes to achieve a specific compression ratio in a given engine size.

It assume a 4cc volume for the gasket, ring land etc.



So if you want a 9:1 ratio in a 1293, you need a total of 36.4cc. If you have 13cc pistons, you need 23.4cc in the head.

Hope this helps.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Good Lad

BTW - I took my buddy VTEC Pete out for a spin this weekend, and even though I am running her in, he gave it a name, the "Brocket"...cause I'm a brocket maaannn, nah nah nah nah nah nah nah nah nah nah nah....

Build thread - http://www.turbominis.co.uk/forums/index.php?p=vt&tid=7483

Katy Mini Owners Club Thread - http://www.turbominis.co.uk/forums/index.php?p=vt&tid=505552

Let's make sure you embarrass at least one VTEC MINI today !

https://www.facebook.com/groups/17557298589...096464253807802

Edited to include 1098s.

Now as an attachment.

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Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Presumably the 'head' volume indicated needs to include any piston to deck volumes?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."