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#21
07-25-2007, 04:01 PM
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Wide plug gaps cause the system voltage to go up. This can increase the likelihood of crossfiring inside the dist. cap, crossfiring between plug wires and will cause a marginal coil or plug wires to misfire. Stick to the smaller gap, even if you upgrade to the MSD.
Eric |
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#22
07-25-2007, 07:55 PM
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While on the subject of spark plug gaps, when I ran nitrous (either a 200 or a 250 shot), I always tightened my gap up from .045" naturally aspirated to .028"-.030" on spray. Eric, where do you guys run your gap at on the Grocery Getter, and do you change it depending on how many stages you're going to run?
__________________
Just a blind squirrel looking for a nut. |
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#23
07-26-2007, 08:31 AM
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.025" regardless of how much we spray. We have several successful tuneups that vary from 450 hp (single stage) to 800 hp (2 stage). With the tight gap and the MSD Digital-7, we have absolutely zero trouble with ignition.
An alcohol funny car racer clued us in on the .025 plug gap years ago and the Pro Mods confirm this. An MSD 7 will jump a pretty wide gap. But wider gaps cause the coil to die prematurely and can cause crossfire in the distributor cap. Eric |
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