Pete Lewis Posted May 13, 2019 Report Share Posted May 13, 2019 Aidan posted this article about the problems many have with plug fouling and never returning to fire correctly often at low life this goes into thoughts of the ceramic becoming contaminated which has some credible overtones https://www.gsparkplug.com/shop/fouling-shortingout-problem-modern-plugs-champion-vs-ngk/ then Andy one of my locals suggested we read this https://patentimages.storage.googleapis.com/23/9c/46/66f4651fa67e4d/EP1434324B1.pdf and after a few pages i lost the will to live have a browse at all these and see what you make of an increase in reliable spark plugs becoming unreliable the choice is yours have fun Pete 1 Link to comment Share on other sites More sharing options...
RogerH Posted May 13, 2019 Report Share Posted May 13, 2019 I have found over the last three years or so that NGK plugs fail all too quickly - less than a 1000 miles use. Once misfires start the plug can;t be retrieved . My symptoms were - slowing down for a tight bend to apprx 10/15MPH come round corner and exit with a slight incline. Put foot down in 2nd gear and it misses badly. OK at speed. Plug life no more than 1000 miles. Changed to Champion L87Y and they have easily done 5000 without a miss. Many of the TR fraternity have had similar issues with NGK. Roger 1 Link to comment Share on other sites More sharing options...
Dick Twitchen Posted May 14, 2019 Report Share Posted May 14, 2019 Notwithstanding all the technical stuff in Pete's articles you only have to search 'Fake NGK Spark Plugs' as a starter to this widespread issue. However, this is not a new thing; Mark Fields (Jigsaw Racing) warned me of this 10 years ago and his suggestion then was 'look for the Made in Japan'. Not sure if this still holds true. I have had no issues with NGK in my GT6 from (re)build but I also but from my local car factors and not from the 'great value/cheap/unwanted stock/etc' on EBay. If it's notably cheaper than rrp than there is probably/possibly a reason. Dick Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 14, 2019 Author Report Share Posted May 14, 2019 Maybe I should have linked the two subjects together would have made sense , but hey ho, I have used champs and ngk for all my life and myself have not had a problem ever , I dont run on choke and keep things in tune so I dont get any sooty plug syndromes, but I have some local cars that can run rich or do short runs so never get a italian clean up One local mkiv spity does a commute 2mile run and is in regular plug fail troubles. The unglazed plug insulator and 22kv ht makes sense to this car We cant up the HT much without invoking dizzy cap and rotor failures , and there been enough of them over the years coupled with duff condensers our std ignition is on its limit including bypassed 1.5 ohm coils ( doubles the ht and amps at the points) blowing points and condensers and tne duff aftermarket parts we are supposed to accept. Pete Link to comment Share on other sites More sharing options...
thescrapman Posted May 14, 2019 Report Share Posted May 14, 2019 I have used NGK BP5ES for many years, but I did find the 6's fouled on the PI cars sometimes. Had one PI that would oil and or soot up the 5's so I have tried some 3-prong Bosch ones recommended by Nick Jones. They seem fairly immune to the PI cars. I have always managed to recover the fouled NGK by wire brushing and cleaning off with thinners. then cook the end over a gas ring. Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 14, 2019 Author Report Share Posted May 14, 2019 Here is a bosch patent https://patentimages.storage.googleapis.com/dd/0f/4e/7e828ff2769090/US6922007.pdf Pete Link to comment Share on other sites More sharing options...
Nick Jones Posted May 14, 2019 Report Share Posted May 14, 2019 I’ve had the NGK fouling issue and written of it before. My PI, in the days when it was still Lucas PI was a great killer of NGKs. I don’t think fake ones as they came from my favourite motor factor, not the internet. It killed a nearly new set of 6, one by one due to flooding caused by TB balance issues. They just couldn’t be got wet. Once fuel wetted they were dead and couldn’t be recovered by cleaning or even cooking with a blow lamp (which I’ve never know fail before). I replaced them, one by one, with scabby old NGKs of the same heat range which though they didn’t work well wet, could be recovered by cleaning and cooking. This answered a long previous mystery as to why a complete set of nearly new NGKs had died in our long departed Nissan Primera GT after I’d inadvertently flooded it after failing to reconnect the coil pack. Took me bloody ages to unscramble that one! Bosch ones, especially the 3 prong ones, seem pretty resistant to fouling and are certainly recoverable after flooding. Nick Not on commission from Bosch btw, mores the pity! Link to comment Share on other sites More sharing options...
Anglefire Posted May 14, 2019 Report Share Posted May 14, 2019 I’ve fitted single pronge Bosch plug to my spitfire - can’t comment on their efficacy yet as it’s not really run due to potential issues. Would have been nice to get out it in tonight but thibgs just get in the way. Link to comment Share on other sites More sharing options...
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