Thread: Spark Plug Wire Grounding
10-15-2008, 02:03 PM #1
Spark Plug Wire Grounding
Would somebody please explain to me if and why grounding the plug wires while plugs are out is necessary and how do you do it on a stock 66u motor. Thanks for sharing your knowledge!!!
10-16-2008, 11:40 AM #2
10-16-2008, 03:25 PM #3
- Join Date
- Aug 2006
Well, if you are talking about grounding out the plugs while cranking the engine over, yes, it is a good idea. You can do it by placing a plug in the wire cap, then laying the body of the plug against something metal, but NOT by the spark plug hole. If you are close to the plug hole, you can ignite the mixture that blows out, and singe your eyebrows amough other things.
The reason you do ground or create a electrical path is since the watecraft has a high energy, electronic generated ingnition, it builds however much voltage is needed to jump the gap(up to a certain voltage). If there is no small gap, or ground, the voltage can go high enough to damage the plug wire or coil, or in earlier ignitions anyway, damage the electronics. (counter EMF). Its just a good practice, and I am sure many can say they didn't and no harm was caused, but why risk it?
10-17-2008, 11:57 AM #4
Thanks so much for the reply and info. For years I haven't grounded the wires when the plugs are out to spin, but you can bet everything that I will from this day on!!
Again, thanks for sharing your knowledge!!!
10-17-2008, 12:01 PM #5
I've never grounded mine when the plugs are out & I'm cranking the engine (for instance to do a compression check) Never had a problem.
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