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at what altitude..?? :)

compression ratio is 10.3 to 1..
as a rough guide just multiply 10.3 by air pressure and take a bit off..


if you want to calculate it exactly
there's loads on the web telling you how to work it out..
 

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Discussion Starter #3
i just want to know when i compression test my spider what PSI i should get if the engine is good ? its currently 100 PSi a pot which i dont think is enough ! thought it would be at least 150 PSi
 

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I would have thought about 130 ish would have been about right.. put a bit of oil in each pot and try again.. see what you get.. not too much. about a teaspoon full.. are all the pots 100??
 

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Discussion Starter #5
yes matey they are all 100 psi , i thought it was low as even 1.2 corsa's have 150psi ! would explain why it wont go and the odd noise its making when turning over ! reckon its going to be a do or die , source another CF1 engine and swap it out or break the car for parts
 
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