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 293 Posts Member #: 10010 Senior Member Northants |
19th Jan, 2014 at 10:54:24am
If by 9:3 do you mean 9.3:1?
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 330 Posts Member #: 9628 Senior Member |
19th Jan, 2014 at 05:48:05pm
On 19th Jan, 2014 Paul S said:
On 20th Nov, 2006 Paul S said:
Every week there is a question about compresion ratio. So I've tried to pull together the collective expertise and experience of the forum on this into a single chart. The chart shows the maximum compression ratio for a given boost. The three curves relate to the inlet closing point of the chosen cam. For example an SW5 has an inlet closing at 48 Deg ABDC and the MG Metro, 56 Deg ABDC so a bit of interpolation is required. Less than 20 degree inlet closing angle has little effect on the dynamic compression ratio. This assumes an efficient intercooler. And 95 RON Unleaded. Not much has changed in 8 years :) New chart updated to 2014:  Ah awesome , I only just seen this 
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