JGC403
Well-Known Member
What should I be using for my 383? I'll be using a HEI ignition kit with the 383 that will be going into my Ram. Truck will have aftermarket gauges and radio. I'm not sure If I should use resistor plugs or wires.
Resistor Spark Plugs, Wires or Both?
- Thread starter JGC403
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67Dart273
Well-Known Member
Depends on if the radio still makes noise, LOL
Start with supressor wires. If they aren't enough go to plugs
Also understand, this is not the entire answer. Sometimes noise is radiated by the wiring, especially in modified wiring. That is to say, the OEM spent a lot of time "getting it right" and "we" come along and change it
"What helps" is bonding straps, min. of two from the rear of the hood to the firewall
Grounding clip / springs for the same reason under the hood. These are add on "electrial contacts" which "bite" into the hood and ground it. Used in two way radio
Lead / harness dress. Since "everything" for an MSD is under the hood except the small red trigger wire, you might put a bypass capacitor on the small red
"Lead dress" means running wiring so it helps suppression. Don't run high current pulse stuff like the two coil wires for your MSD next to other harnesses. DO run it as close as possible to the firewall and / or block to provide a ground-plane type shield.
DO NOT put a radio supression cap on the coil positive (with MSD) and DO NOT hook a tach up there
If you have a tach, try unhooking it and see if it drops the noise.
Start with supressor wires. If they aren't enough go to plugs
Also understand, this is not the entire answer. Sometimes noise is radiated by the wiring, especially in modified wiring. That is to say, the OEM spent a lot of time "getting it right" and "we" come along and change it
"What helps" is bonding straps, min. of two from the rear of the hood to the firewall
Grounding clip / springs for the same reason under the hood. These are add on "electrial contacts" which "bite" into the hood and ground it. Used in two way radio
Lead / harness dress. Since "everything" for an MSD is under the hood except the small red trigger wire, you might put a bypass capacitor on the small red
"Lead dress" means running wiring so it helps suppression. Don't run high current pulse stuff like the two coil wires for your MSD next to other harnesses. DO run it as close as possible to the firewall and / or block to provide a ground-plane type shield.
DO NOT put a radio supression cap on the coil positive (with MSD) and DO NOT hook a tach up there
If you have a tach, try unhooking it and see if it drops the noise.
nm9stheham
Well-Known Member
Typically, you use one or the other, not both. You are using resistance to slow the rise and fall times of the spark, which removes the high frequency content of the waveform. Too much resistance does no further good for interference suppression, but burns up too much spark energy.
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