Page 1 of 1
Someone educate me about resistor and non resistor spark plug caps
Posted: Sun Oct 28, 2018 6:12 pm
by RoSy
My set up is Pazon Ign, silicon HT lead, plain rubber plug cap, NGK Iridium plug on my 03 Iron barrel. Ive just read a load of info but the only down side I can really deduce is that I'm going to interfere with someone's TV or Radio, as was the case back in the olden days when granny would moan about motorbikes going up and down the road making her TV go all fuzzy and they were a curse on modern society.
Someone educate me about resistor and non resistor spark plug caps
Posted: Sun Oct 28, 2018 10:33 pm
by Adrian
The common view is that with coil ignition you need EITHER a suppressed plug cap with a non-resistor plug, OR a resistor plug and an unsuppressed plug cap. The NGK Iridium is a resistor plug, so an unsuppressed (plain) plug cap will do. If your ignition is very good you can probably use both. Any particular reason you're using a silicon and not copper core HT lead? Just curious.
Back in olden days there were a lot more magneto-equipped bikes around, even now I still see recommendations for un-supressed plug caps for these, the BT-H electronic (CDI) magneto instructions insist on them...
A.
Someone educate me about resistor and non resistor spark plug caps
Posted: Mon Oct 29, 2018 8:21 am
by Mark M
The power supplies for modern televisions/screens are very unlikely to be affected by RF (radio frequency) spikes which are electro-magnetic pulses so Granny shouldn't get any interruptions to Strictly.
REgards, Mark
Someone educate me about resistor and non resistor spark plug caps
Posted: Mon Oct 29, 2018 8:30 am
by RoSy
I'm using a silicon lead because it's been lying around the workshop for about 10yrs and it's blue , and I once heard that they conduct the spark better, but I don't that for sure . I do know that it works fine and there is a healthy spark, but I do carry a spare copper core HT just in case.
Someone educate me about resistor and non resistor spark plug caps
Posted: Mon Oct 29, 2018 11:53 am
by Adrian
Mark,
I don't think it would have been a power supply issue, more a case of un-suppresed ignitions interfering with the old analogue broadcast signal. One bit of advice for determining exactly when the points open on old coil ignition systems (presumably with any supressor caps removed) was to place a radio next to the bike with the tuner set to a blank bit between stations, the points opening would produce an audible click on the radio. My parents' telly was on Rediffusion, an early cable system, which seemed immune from whatever the local rockers were riding.
A.