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> Increase sparkplug gap with CDI ignition box??, for /4 motors :)
Mueller
post Jun 14 2005, 01:57 PM
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taking tommorow off from work to hopefully "fix" my ignition and fine tune the fuel injection.....according to what I can find, the stock sparkplug gap should be .7mm (.028") for my 1.8 motor.

I thought that with the CDI such as a Mallory or MSD, I could open the plugs up to .050-.060" (according to MSD documents)

anyone have any real world experiance with this??

thanks
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Joe Ricard
post Jun 14 2005, 03:07 PM
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QUOTE (john rogers @ Jun 14 2005, 12:31 PM)
Well, when I put in the MSD system in the race car, I checked with MSD and they said to use .055 taking in consideration the carbs (Weber 48s), cams (906), coil (MSD), plug wires (9mm) and octane (100) of the gas I plan to run. They said if it is too small you loose power because of less burn and if too big the spark looses energy jumping too much gap and the burn happens too late. I also run an A/F mixture of 12:1 at wide open and so far .055 has worked well.

Now see there... Here is some real world experience with a who said and why.
I also run a gap of .045 which seems to work for me. have't given much thought to it but now I got an idea. (IMG:http://www.914world.com/bbs2/html/emoticons/idea.gif)
Again I wish I had a dyno and wide air fuel meter.. The butt dyno is not calibrated for this kind of tuning.
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Posts in this topic
Mueller   Increase sparkplug gap with CDI ignition box??   Jun 14 2005, 01:57 PM
ArtechnikA   i use 0.046" with my Crane HI-6. seems to work jus...   Jun 14 2005, 02:09 PM
DNHunt   Mike I used a .048 gap with a MSD 6A. I also use...   Jun 14 2005, 02:14 PM
Joseph Mills   <...   Jun 14 2005, 02:26 PM
john rogers   Well, when I put in the MSD system in the race car...   Jun 14 2005, 02:31 PM
Joe Ricard   ...   Jun 15 2005, 07:03 AM

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