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16V engine build

 
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rsfruitbat
Alfa Sprint


Joined: 13 Jun 2007
Posts: 241
Location: Kidderminster

PostPosted: Mon Jun 18, 2007 7:41 am    Post subject: 16V engine build Reply with quote

Does anyone know for sure what the compression ratio is as standard on a 33 16V engine?
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rsfruitbat
Alfa Sprint


Joined: 13 Jun 2007
Posts: 241
Location: Kidderminster

PostPosted: Wed Jun 20, 2007 1:56 pm    Post subject: Reply with quote

I am reliably informed from an Alfa specification that the CR is 10:1.
However having measured the various components I have come up with a compressed volume of 47.5cc. I have got this from cylinder head 29.2cc, head gasket 8.6cc, piston crown 9.7cc. Thisworks out as being 9:1. Can anyone explain this?
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hugh jinjin
Alfasud


Joined: 04 Sep 2004
Posts: 68
Location: Glasgow

PostPosted: Thu Jun 21, 2007 9:51 am    Post subject: Reply with quote

measurements are about right but your calculation is wrong Embarassed What you have calculated is the ratio of swept volume to static volume, not the compression ratio.
cr is the ratio of uncompressed volume to compressed volume ie swept vol PLUS static volume to static volume or add 1 to your calculation to get the correct cr of 10/1.
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rsfruitbat
Alfa Sprint


Joined: 13 Jun 2007
Posts: 241
Location: Kidderminster

PostPosted: Thu Jun 21, 2007 5:06 pm    Post subject: Reply with quote

Thanks for that. Feel a bit stupid when its something that obvious. Appreciate your help. Rolling Eyes
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