Re: Not what I meant... - Saab Sonett Bulletin Board - Saabnet.com
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Re: Not what I meant...
Posted by paratrooper34 (more from paratrooper34) on Sun, 7 May 2006 07:28:05
In Reply to: Re: Not what I meant..., Wiliebill, Sat, 6 May 2006 20:05:55
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The Saab Sonett service manual states that from 1971 and on, the compression ratio of the 1698CC engine was 8.0:1. If you keep everything as it was made, that will be your compression ratio. If you plane the heads, have the block decked, change to different style pistons (with wrist pin location closer to the bottom of the piston or use domed pistons) you will increase the compression ratio. If you increase piston size without doing any of the above, you will decrease compression ratio. It is pretty simple: Anything that increases the size of the combustion chamber decreases the CR; anything that makes it smaller increases the CR.
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