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  #11  
Old 02-27-2008, 11:05 AM
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the beast still runs great! I could care less that I don't have 120 on every cylinder.
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  #12  
Old 02-27-2008, 11:35 AM
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Default Uh, yeah...

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I would be in heaven if my 60 could reach 60mph on I-70. 35 tops going up that hill...
X2 !!!
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  #13  
Old 02-28-2008, 04:52 PM
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Originally Posted by treerootCO View Post
the beast still runs great! I could care less that I don't have 120 on every cylinder.
Same here. On the F I pulled from my 71 year before last, I was down to about 60 on #4, but it still fired. The reason I pulled it was rod knock, not compression.
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  #14  
Old 02-29-2008, 08:29 AM
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90 will run just fine. Not fresh, but probably not broken rings either.

I am sure you've probably already read about the trick of putting a teaspoon of oil into each cylinder to see if the number come up or stay the same; if they come up it's rings, if there's no difference it's valves.

A couple tricks an engine builder taught me about taking compression readings:

(1) Take all the plugs out.
(2) When cranking the engine, open the throttle so the cylinders get full air.
(3) Try the reading 2 or more times to make sure (this is actually basic metrology).
(4) At higher altitudes, you can never get sea level numbers (this is basic physics).

The absolute pressure in Denver is about 12 PSI, versus 14.7 at sea level. Expect compressions numbers to drop by that ratio (12/14.7=0.8) or to convert Denver readings to sea level divide by that number (90/0.8=113). A nominal 150 PSI engine should read about 120 in Denver.
Good stuff Jeff - you don't really want to move to Alaska, do you?
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  #15  
Old 02-29-2008, 12:48 PM
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Good stuff Jeff - you don't really want to move to Alaska, do you?
No I don't really want to move there, would probably get S.A.D. in the winter, but we definitely plan to drive up and visit this summer. Say hey to Mark Whatley and the shop crew, visit with all my Calgary buddies either on the way up or back, visit Talkeetna, etc.
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