Louie Posted January 30, 2014 Author Share Posted January 30, 2014 Just received an order of 24 NGK DR9EA plugs, all came with caps. $4.66 each. What's the difference with 'R' in the part no? Link to comment Share on other sites More sharing options...
dlegg Posted January 30, 2014 Share Posted January 30, 2014 Technical information Resistor Spark Plugs Resistor type spark plug’s incorporate an internal resistor to suppress ignition noise generated during sparking. The ignition noise which is often known as either electromagnetic interference (EMI) or radio frequency interference (RFI) can disrupt electronic communication signals, effecting the performance of sound systems, cellular phones, two-way radios and even engine management systems. As EMI or RFI can also cause premature failure to other electronic components in a modern vehicle, it is important that resistor spark plugs are used to prevent this possibility. Put simply, when a spark is formed it creates a mini-earthquake in the electronic world; the internal resistor in a spark plug filters out the noise created that may affect electrical components I was getting interference on my microair radio with D9EA plugs so tried these. All noise went away:oh yeah: 2 Link to comment Share on other sites More sharing options...
jetjr Posted January 30, 2014 Share Posted January 30, 2014 Can you get R plugs in iridium type? Link to comment Share on other sites More sharing options...
kgwilson Posted January 30, 2014 Share Posted January 30, 2014 Just go to your local mechanic. He replaces plugs all the time. Ask him for a few old NGK plugs. You might have to fish them out of the bin. Unscrew the lead connectors & you are ready to go. Link to comment Share on other sites More sharing options...
Bob Llewellyn Posted January 30, 2014 Share Posted January 30, 2014 Technical informationResistor Spark Plugs Resistor type spark plug’s incorporate an internal resistor to suppress ignition noise generated during sparking. The ignition noise which is often known as either electromagnetic interference (EMI) or radio frequency interference (RFI) can disrupt electronic communication signals, effecting the performance of sound systems, cellular phones, two-way radios and even engine management systems. As EMI or RFI can also cause premature failure to other electronic components in a modern vehicle, it is important that resistor spark plugs are used to prevent this possibility. Put simply, when a spark is formed it creates a mini-earthquake in the electronic world; the internal resistor in a spark plug filters out the noise created that may affect electrical components I was getting interference on my microair radio with D9EA plugs so tried these. All noise went away:oh yeah: HATE THEM - the resistors eventually fail open-circuit; it's an issue in cars if you do a lot of mi... er, kms; also an issue if you run single ignition... Link to comment Share on other sites More sharing options...
jetjr Posted January 30, 2014 Share Posted January 30, 2014 Few points Original NGK caps are aluminium, easy to crush and damage, also tend to loosen with heat changes Auto Wreckers can supply brass ones What about resistor covers, they work the same way just thought might be more robust. Buying 12x might be expensive. http://www.ngksparkplugs.com/products/performance/resistor_covers.asp?mode=nml Link to comment Share on other sites More sharing options...
Bob Llewellyn Posted January 31, 2014 Share Posted January 31, 2014 Few pointsOriginal NGK caps are aluminium, easy to crush and damage, also tend to loosen with heat changes Auto Wreckers can supply brass ones What about resistor covers, they work the same way just thought might be more robust. Buying 12x might be expensive. http://www.ngksparkplugs.com/products/performance/resistor_covers.asp?mode=nml Resistor covers seem to work on Rotax 2-strokes, though I still won't have them on a single ignition engine - note that my Icom seems happy enough with the coax in good condition and the antennae 3m from the donk... Personally, I LIKE an ignition that can slay an elephant at ten paces... Link to comment Share on other sites More sharing options...
Louie Posted January 31, 2014 Author Share Posted January 31, 2014 HATE THEM - the resistors eventually fail open-circuit; it's an issue in cars if you do a lot of mi... er, kms; also an issue if you run single ignition... Answered my next query why wouldn't the 'R' ones just be the norm. (bit strange one Robert Llewelyn replying to another. What's the chances of that!) Link to comment Share on other sites More sharing options...
Bob Llewellyn Posted January 31, 2014 Share Posted January 31, 2014 Answered my next query why wouldn't the 'R' ones just be the norm. (bit strange one Robert Llewelyn replying to another. What's the chances of that!) A lot of cars use resistor ignition leads; if using both resistive leads & plugs, spark gets weak. Use resistive plugs on your lawnmwoer, they die every 20 hours or so from the vibes... "Roses are Red, Violets are Blue, I'm schizophrenic, And so am I"... Link to comment Share on other sites More sharing options...
rankamateur Posted January 31, 2014 Share Posted January 31, 2014 If you head to Repco etc for bits, even filters, dont say they are for aircraft, i think they have to refuse to sell. Tyre tube too? Link to comment Share on other sites More sharing options...
Bob Llewellyn Posted January 31, 2014 Share Posted January 31, 2014 Tyre tube too? ask their insurers! Link to comment Share on other sites More sharing options...
Nick Evison Posted January 31, 2014 Share Posted January 31, 2014 Or find a friend with a Rotax, their plugs come with caps on them but don't use them. Generally have a box full of caps if they haven't throwen them away. Jabiru.... Still dependant on a Rotax for reliability. Sorry couldnt help myself. ;-) Link to comment Share on other sites More sharing options...
frank marriott Posted January 31, 2014 Share Posted January 31, 2014 Any resistance in an electrical circuit causes a voltage drop and current decrease refer to ohms law E = I x R If ignition noise is not an issue I wouldn't use them - less things that can fail. 3 Link to comment Share on other sites More sharing options...
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