klougnot wrote:Hi Pinhead,
I got a couple quck questions about this project.
1. I want NGK 0 ohm plugs so I can use Iridium plugs. So I need a model number if you got it.
2. What kind of plug wire do I need to hook up the caps to the coils. Any details here would help out alot.
Thanks!
-Kyle
The NGK Iridium spark plugs that I've found are 5k ohms each. As far as I'm concerned, with the power that these coils are capable of, I don't think iridiums are needed. If you still want to use them, though, the PN is DR8EIX. Note the "R" in the part number indicates that it is a resistor plug.
If you do go with Iridiums, be sure to experiment with your plug caps; I haven't decided if the bike runs better with resistor plugs and plug caps or if it runs better with only resistor plugs.
Theoretically, with the lack of turbulence that the hemispherical chambers produce, a longer spark duration would help ignite the mixture (more resistance in the plugs slows the discharge and therefore extends the spark duration).
However, there's another theory that says we want a good, strong initial spark to get the flame front to start to expand as quickly as is possible.
I haven't figured out which way is best for our machines (and my results will likely be different than a stock bike due to my highly modified engine).
I've been running the HEI system with DR8EIX's without plug resistors and it seems to work well, so I believe either way will suffice in a stock engine.
When it comes to the spark plug wires, I just bought a set of 7mm Accel universal SuperStock wire and used the "spark plug end" on the coils and screwed on my stock CB650 spark plug boots on the other end.