Fun with spark plugs

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   I made up another brand new set of wires using different MSD boots with 90 deg bend.  I ran a quick test and same problem.     

Sounds like this is the same problem I was told about.  They saw the video clip.  Suggested a different brand of wire and boot.    I may see if I can find the same stuff they were using.  

Hey Scott, some very helpful info there.  Thanks for posting it.  I wondered if your company had a standard they were using for pressure and gas.    I was considering the pressure was a little different at  the time of ignition.   May not have been clear in prev. posts, but I was using (1 - (28 (ign timing) / 180 deg ) ) * cranking pressure.   Then converting to atm.   This is why the cranking pressure and number I was using to calc. the total pressure was the about the same.  Ones PSIG, the other A. 

Yes this test setup really should all be mounted on a plane.  My plan is to make a wooden box to hold everything with some cavities for the pumps, power supply, computer interface, etc.  Then line it with copper.   The window will have a screen that you can view through the box once the lid is closed up.     

Currently the thing is running in some rolled up screen mesh for the most part, except when I want to get a better picture with the camera.    It's a pile of electronic mess spilled onto the floor in my little home lab.    Our dog seems smart enough not to go near it.  I think its the sound of the spark that bothers him.

The path for the current is between the outputs of the coils.  The other path is the between the outputs of the ignition.     Isolating the chamber is not doing much but your right that it would help the noise to get this all on a plane.   As the chamber is floating, I am sure if you touched it while the test was running, you would feel it.    Ground strap would prevent this as well.  