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#19808 05/19/2005 12:37 AM | Joined: Apr 2003 Posts: 27 Apprentice | | Apprentice Joined: Apr 2003 Posts: 27 | What is semi normal compression for s 216 chevy with about 100,000 miles? Mine averages 100lb for each cyl. Thanks
rrf
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#19809 05/19/2005 6:28 AM | Joined: Jan 2005 Posts: 52 Member | | Member Joined: Jan 2005 Posts: 52 | 50 chevy, The only thing I could find in my manuals is the compression should be 110 psi or greater with each cylinder being within 5 to 10 psi of each other. How does your engine run with the compression at 100 psi, does it smoke or use oil and if not, run it till it dies.
Jamo | | |
#19810 05/19/2005 1:07 PM | Joined: Feb 2004 Posts: 29,743 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,743 | Compression pressure isn't as important as uniformity between cylinders. If you use 3 different compression gauges, it's likely you'll get 3 different readings. I like to see numbers in the 85-to-125 pound range, with no more than 10% variation between cylinders. If you get a major bump in pressure when a little oil is added to the cylinder, you're headed for piston ring problems soon. If a low cylinder doesn't come up when a tablespoon or so of oil is added, the problem is probably valve-related.
Jerry
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