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| | | | Joined: Mar 2011 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2011 Posts: 47 | Hey guys, I have a question. What should my compression be on my 216? The engine is a 1953, all stock.
Sure appreciate any info.
Thanks. | | | | | Joined: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | My google search brought up this... AD specs
Give me ambiguity
or give me something else
| | | | | Joined: Mar 2011 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2011 Posts: 47 | Thanks, That is some great info. Thanks again | | | | | Joined: Feb 2004 Posts: 29,756 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,756 | That chart seems to be a little optomistic on compressiion pressure. As long as the pressures don't vary a lot, compression from 80-100 PSI should be acceptable. A maximum variation of about 7%-10% from one cylinder to another is considered to be acceptable. Be sure you're cranking the engine with a well-charged battery, with all the spark plugs removed and the throttle blocked wide open. I've seen stovebolt engines run pretty smoothly with compression as low as 40-50 PSI as long as all the cylinders were within a few pounds of each other.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Mar 2011 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2011 Posts: 47 | Jerry, Thanks for the info. You see, the reason I ask is my engine idles roughly. It kinda has what feels like a stumble. I've checked everything as far as I know. The vac holes to the riser are clear, carb was rebuilt. good compression, over 100, no smoke, clean fuel filter, new fuel pump, new air filter, point, plugs, condenser, coil. I can't seem to figure it out. I appreciate any advice. Thanks. | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | one thing to check is your idle mixture adjustment on your carb. ...click... steps 1 - 4 also idling adjustment ...click... steps 1 - 5... using a vacuum gauge | | |
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