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| Compression test https://www.slantsix.org/forum/viewtopic.php?t=61803 |
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| Author: | afastcuda1970 [ Fri Jan 05, 2018 3:07 pm ] |
| Post subject: | Compression test |
I changed the spark plugs today and decided to do a compression test while I was in there. Here are the results: 1. 160 2. 160 3. 170 4. 170 5. 160 6. 160 I guess this engine is in better condition than I thought. It still uses oil but no puddles under the truck or no smoke. |
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| Author: | Dart270 [ Fri Jan 05, 2018 4:59 pm ] |
| Post subject: | Re: Compression test |
Excellent! Lou |
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| Author: | coconuteater64 [ Sun Jan 07, 2018 7:14 pm ] |
| Post subject: | Re: Compression test |
Those are some good numbers! |
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| Author: | east3rd [ Tue Jun 19, 2018 7:44 pm ] |
| Post subject: | Re: Compression test |
I did the same thing today as part of diagnosing my starting issues - thought I may have had a compression issue in #1 while trying to find TDC. My numbers weren't as high, ranging from 140-150. My spec material states 130-160 with a max variance of 20 so well within range and tolerances. Only concern is that I may have a leak in the valves as my vacuum/pressure gauge doesn't stay put on the compression stroke, and I can clearly hear a hiss coming from somewhere. Does anyone have any idea how to tell if it is indeed the valves or the piston rings? I suspect the valves as the engine had been running very rich so lots of carbon buildup! Here's a video of the sound - #1 is closest to the camera. You can hear the hiss once the intake closes (2nd valve from camera), and the compression begins. Video FYI there are no spark plugs in any other cylinders so the only hissing is coming from #1. Thanks as always! |
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