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| Flair Birds [1964-1966] You have a Fourth Generation Bird or just have some questions about them? Then this forum is for you, check it out. |
This is a discussion on help with compression within the Flair Birds [1964-1966] forums, part of the Thunderbird Model Years category; Hello there. I am working on my dad's 65 Bird. It has a 390 4bbl. What is an acceptable amount ...
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11-04-2009, 08:49 PM
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help with compression
Hello there. I am working on my dad's 65 Bird. It has a 390 4bbl. What is an acceptable amount of piston compression. I have 2 cylinders with pretty low compression compared to the others. I just want to know what is acceptable. I have as follows;
cylinder#1 55 psi cylinder#2 95 psi cylinder#3 90 psi cylinder#4 90 psi cylinder#5 70 psi cylinder#6 90 psi cylinder#7 110 psi cylinder#8 100 psi 
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11-05-2009, 09:53 PM
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55 PSI is definitely unacceptable. 70 psi is not good enough, either. If I recall correctly, the lowest compression should be within 20 psi of the highest cylinder. I've seen engines that run pretty good on 90 psi per cylinder.
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11-05-2009, 11:34 PM
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That's what I figured. I guess an engine rebuild is is order. Thanks for the info.
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