compression test completed - Team Camaro Tech
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post #1 of 3 (permalink) Old Mar 21st, 10, 11:53 AM Thread Starter
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gary
 
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compression test completed

hi everyone just finished a compression test on the 327 2bbl,my readings are,#1=145 #3=145 #5=145 #7=150 left bank#2=155 #4=140 #6=150 #8=150. can someone tell me if my compression is where its saposted to be.all plugs looked the same a little dark.thanks gary
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post #2 of 3 (permalink) Old Mar 21st, 10, 12:11 PM
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Re: compression test completed

Quote:
Originally Posted by Real canadian67 View Post
hi everyone just finished a compression test on the 327 2bbl,my readings are,#1=145 #3=145 #5=145 #7=150 left bank#2=155 #4=140 #6=150 #8=150. can someone tell me if my compression is where its saposted to be.all plugs looked the same a little dark.thanks gary
Now do a leak down test at TDC as that will really tell you whats going on!!!!!!!!!
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post #3 of 3 (permalink) Old Mar 21st, 10, 12:26 PM
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Ron
 
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Re: compression test completed

Testing the Cranking Compression with the Generic Hand Held Gauge is really nothing more then a Preliminary Observation as to the condition of an engine. Your results look consistent indicating that there does not appear to be anything radically wrong with your Stock 2bbl 327. There are variables that determine the Cranking Cylinder Pressure of an engine - cam profile and where it is installed ... etc.

Other then a visual inspection of the Valve Train, Tappet Adjustment, Cam and Timing Chain wear, the Best method for determining the condition of a engine is a Leak Down Test - Where the Engine is tested at a determined Degree PAST TDC on the Compression Stroke, with both valves closed, where say 150lbs of air pressure is pumped into the Cylinder and the TIME is measured with a Stop Watch for the pressure to drop to say 80lbs for each Cylinder - Noting the sound of any air escaping into the Crank Case, Exhaust, Intake and Cooling System indicate the condition of Rings, Valves, Gaskets ... etc.

Learning to read a Vacuum Gauge can give you a good indication of Rings, Valves and possible bad Cam lobes.

With the plugs out and Turning the Engine with the Fan Belt will give you a good indication of Timing Chain Slack.

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Last edited by Z15CAM; Mar 21st, 10 at 12:54 PM.
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