Timeline for Spark plug working fine in free air, but hard miss in engine
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| May 28, 2022 at 16:22 | comment | added | edt11x | I think it would be good to include Wikipedia entry Rodney sited. This is the reason why you might get a good spark at atmospheric conditions and get a misfire under compression. From motocross, I found misfire under compression to be common on fouled plugs and still test fine out of the cylinder. | |
| May 28, 2022 at 8:24 | comment | added | Rodney | The resistivity of air is very high until you reach the breakdown voltage and then it goes very low. What's changing with pressure is the breakdown voltage, I found this en.wikipedia.org/wiki/Paschen%27s_law | |
| May 27, 2022 at 17:29 | comment | added | Brydon Gibson | I'd be curious to know the amount of increased resistance due to compression - is it directly proportional to the number of atmospheres? | |
| May 27, 2022 at 14:26 | history | edited | Pᴀᴜʟsᴛᴇʀ2♦ | CC BY-SA 4.0 |
added 2 characters in body
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| May 27, 2022 at 13:48 | comment | added | blacksmith37 | Get new plugs. I cleaned used plugs then tested them in an air pressure chamber; new plugs could take more air pressure before failing by sparking deep in the body. | |
| May 27, 2022 at 13:25 | history | answered | Jupiter | CC BY-SA 4.0 |