Anything new on NGK iridium plugs being made for R? Past threads have suggested that they were not the longer 26mm thread? <br>Our local supplier is clueless and the Denso brand is not available at the bottom of the world. <br>Is anyone running NGKs?
I'm running the Denso Iridiums. Did not notice a difference over the OEMs when the plugs were new, nor have I noticed one since. Maybe they'll outlast the OEMs, but I'll have no way of knowing. I recommend that you not bother.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Johann</b> »</i></TD></TR><TR><TD CLASS="quote">Can't go wrong with the OEM plugs.</TD></TR></TABLE><p>True. <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>Many local R and other P2 owners are experiencing fried coil packs for some reason after installation of NGK or Denso Iridium plugs. <br>My self included. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0">
I Hope You found Out about the Plugs , Ya NGK list a Plug Number for My V50 - this is 2007 in the Fall the Irridiu's IX have been out for<br>a long time and Yet they NGK still Recommends the 19MM plugs<p>All AWD's have the Deeper Heads like the R and need the 26.5mm<br>Plugs ( Yet No One Knows Jack about It ) <p>What Gives ! <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
A good question to ask would be "who is the oem for the coil packs and do they also mfr spark plugs?"<p>According to IPD, it's Bosch. And, obviously they make plugs. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> <p>From Bosch website: recommended FR7MPP10<br>14mmX1.25 Resistor Heat Range: 7 Depth:25mm Electrode height: 3mm Electrode version & Material: P, Platinum Version: 10 Gap: 0.028<p><A HREF="http://www.rockauto.com/dbphp/prt,23,FR7MPP10" TARGET="_blank">http://www.rockauto.com/dbphp/prt,23,FR7MPP10</A><p>Interestingly, Bosch, who make the whole gamut of plugs including the pricey & profitable iridiums, recommend these. <p>$6/ea at Rock Auto ($2 less than the plug for my measly V70NA!)<br><A HREF="http://www.rockauto.com/dbphp/prt,23,FR7MPP10" TARGET="_blank">http://www.rockauto.com/dbphp/prt,23,FR7MPP10</A><p>(True to Volvo form, though, they're still 2X as much as many others. But, all the precious metal plugs have gone up a lot in the last couple years as metal prices have taken off.)<br><BR><BR>
<i>Modified by MrTippy at 11:24 AM 2-15-2008</i>
An update to my earlier Denso Iridium experience in which I said there was no benefit to using them: I've since tried them again -- after an interval of using stock platinums -- and the Denso's do work well, probably better than the stock plugs. <p>So, what's the difference this time? Gapping. I cleaned the Denso's with a spark plug sand blaster and checked the gap. They were all too wide. For a car with a chip and Torco in the tank, it would be better to have them a bit narrow, not wide. I gapped them a smidge tight -- even though Denso says you should not gap them at all -- and the difference is noticeable, especially under high load/throttle openings. No misfires or stumbles. Pulls solidly everywhere.<p>As your engine mods increase and boost, fuel, and power increase, any plugs gapped down a bit might offer the same benefit.
I went full tilt and got the Denso's , I can here a slight Tone difference in the motor and it is Smoother. Now the Oem Plugs I had gaped closed by .010 to get a Hotter Spark .<br>Get a Better Spark , I tried Grinding the Tips to Perform Like Bosch's , I Marked them and Counted the Thread Depth in the Cly. Head . with a Drop Gage (this Drop Gage has got a T Sq. so I could rest It on top of the Head ) The entire reason for going thur that was First I asked Volvo Parts Guy for V50 Plugs ( They weren't sure what they took )<br>Sec. After Owning a few Brand New Vech.'s and finding on Two Occasions the Wrong Plugs Put in the motor from the Factory ! <br>( I was Like What's going On Not Again ! )<p>I Took the NGK's - Back Down to the Dealer and made Him call NGK Rep<br>to Inform Him that the Plugs they List as being Correct are ( Incorrect !)<br>NGK's Standing @ the Time is all their Plugs are made to Quote: <br>(Fit a Variety of Engines !) What Ass Holes !<p>How Cares If Your Engine has 4-5 Threads Fully Exposed to the Combustion Chamber , , so that the threads will fill up with Carbon etc. !<p>I Had done the above as, I had a Pair of NGK's in My Hand to put In , But<br>Noticed the Reach Difference . So I then Marked the OEMs and Indexed Them ! ( The Indexing seemed to help ).<p>But the Denso's are Still Better !<br>I was Hoping that Bosch's Irridium - Fusion Plug would be Out ( NO Luck )<br>There. I'm going to run a Few Tanks of Fuel and will be Testing Denso's Under Various Conditions ,First Test will be for MPG, Them a Power Test .<p> <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <B></B> <BR><BR>
<i>Modified by EngTech at 1:30 AM 2-16-2008</i>