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Improving ignition with low cylinder compression


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So, let's say my engine has good compression on 5 cylinders, but the 6th is pretty low, like 90 psi. Low enough to where it will foul spark plugs due to misfires. Now let's say that while I wait for an engine rebuild on a spare engine, I like to drive around. So, how do I improve ignition on this single cylinder?

 

I tried increasing my spark gap from the stock .045" to 0.060", with what I think is great results. As in, my fuel table which has been more or less way out of whack due to the misfires, starts to make sense. I had to lean everything waaaay out to get it to idle, and run correctly. Is this just a coincidence, or did I stumble on to something?

 

What else can I do? Run a hotter plug? I'm not planning on running any endurance series on this motor, I just like to go to club events and stuff nearby.

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