took me a couple of reads to figure out exactly what you were doing, but it would make sense...
Turbo Matty P said:Actually, there is a litle used spark plug trick that makes pretty good power (on certain cars) It's called "indexing". NASCAR swearas by it and you know how picky those guys are about power. Basically what you do is pull out your stock/new plug and with a felt marker mark the side of the plug (on the white part where the electrode is "open". Then screw the plug back into the socket. Mark on the head where the intake charge enters the combustion in relevence to the plug. Look at your two marks. The trick now is to use varying sizes of (a single washer) to close the gap between the marks. What this does is rotate the back of the electrode away from the intake charge. This exposes only the spark to the air/fuel mix as opposed to the mix hitting the electrode and having to ricochet around in the combustion chamber. This alone (on stock copper plugs) made a 4whp gain on my turbo pinto. I wouldn't expect to see as large of a gain on a 2.0L NA motor, but when it comes to extracting power everylittle bit helps.
p.s. If using this trick on a FI motor you may encounter problems with high psi applications. I had a tendancy to actually blow the spark out. This was cured by way of the Jacobs IcePak ignition. Also if you purchase any products from Jacobs ask them about the Indexing washers. They are all ready pre-measured in degree radius' so all you have to do is find the angle you need with a protractor and use the appropriate washer. Takes out all of the trial and error. I believe their indexing set is only about $4.