![]() I am in the process of buying a 2002 Chevy Cavalier. Also keep in mind that if the plug comes straight down from the top, there will be no difference. Maybe you should first do the 'Visual check' to see if they are needed. Mind you it's not a dramatic change.Īnd you're right. Burning your fuel more efficiently will increase your gas milage, with fewer trips to the pumps. It's not about increased horsepower anymore. Simply find out what direction the chamber is located (usually TOWARDS the engine when the plug is angled), look at the print on the side of the plugs, and ensure you get the max electrode opening towards the cylinder when tightening it down. It occurred to me this is a simple MECHANICAL adjustment, and not one that needs fiddled with as far as Dyno, Meters, and other stuff. ![]() This was true for several different manufacture plugs I tried, including 'Split-Fire'. The arm holding the gap was pointed AWAY from the center of the combustion chamber. When I hit the optimum spot, I pulled the head off the cylinder and looked where it was. ![]() At one full turn out, the RPM wasn't as high, but the peak in that range was still there (but with lower compression). The change was audibly different - very obvious. At one idle setting, the RPM ranged from 2000 down to 1700. I used high temp grease on the threads to maintain compression. A few years back, I played with a single cylinder ATV and noticed that a spark plug fired best at a certain rotational position.
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