daverclasper Posted March 25, 2019 Report Share Posted March 25, 2019 (edited) Hi all. Today I went to fit new plugs that I bought a while back. In the past I've used BP5ES, though new ones are BP6ES (didn't notice at the time). I think the 5's are usual? and the 6's are cooler?. Any reason why I should not try them ?, maybe have to alter timing/mixture a bit if I do?. Thanks for any advice. Dave Edited March 25, 2019 by daverclasper Link to comment Share on other sites More sharing options...
johny Posted March 25, 2019 Report Share Posted March 25, 2019 they might foul a bit easier but that can be mitigated by driving harder😍 Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 25, 2019 Report Share Posted March 25, 2019 Theres little difference between 5 or 6 ,many use 6 if you look on comparison sites a example is champions who Have for years had a multi range equivalent being a N7/9Y So if NGK did the same BP5/6ES it would make it easy for you Dave Fit them dont change anything else ,it will be fine just dont get any with an BPRES suffix Pete Link to comment Share on other sites More sharing options...
poppyman Posted March 25, 2019 Report Share Posted March 25, 2019 I have used both as well Dave, and had no problem at all. Tony. Link to comment Share on other sites More sharing options...
daverclasper Posted March 25, 2019 Author Report Share Posted March 25, 2019 Thanks chaps. Will look no further into it. Dave Link to comment Share on other sites More sharing options...
thescrapman Posted March 25, 2019 Report Share Posted March 25, 2019 6 is usual, 5 is a hotter one. I use 5 in my PI equipped cars as they seem less likely to foul. Well I did until I,was pointed at the 3-prong Bosch ones. Link to comment Share on other sites More sharing options...
Nick Jones Posted March 27, 2019 Report Share Posted March 27, 2019 On 25/03/2019 at 21:24, thescrapman said: Well I did until I,was pointed at the 3-prong Bosch ones. Are you a convert Colin? To OP, if you must use NGK either 5 or 6 will work. 6 preferred (IMO) unless you have a bit of an oil burner. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 27, 2019 Report Share Posted March 27, 2019 just been looking at some 4 pronged plugs , not in a triumph but 3 of the 4 have almost disappeared it ran like a dog , new single point has it back on song. how can a spark decide which of the 3 or 4 to jump to its not going know where to go , and with 3 of the 4 burnt away and ingested i dont see the 'got to have one ' or why they are of any improvement ..... just seem marketing rubbish Pete Link to comment Share on other sites More sharing options...
johny Posted March 27, 2019 Report Share Posted March 27, 2019 I thought the spark just jumps to the closest prong (or possibly where the intervening gas has lowest resistance) then when that prong has worn a little and the gaps opened up it goes to the next nearest. In terms of gap this type of plug should last 4 times as long as a conventional one with each of the 4 prongs wearing away equally at a 1/4 of the rate of a single one. Should avoid ever having to adjust the gap which with todays labour rates is quite a saving however somethings wrong if youve found 3 prongs gone and one left! Link to comment Share on other sites More sharing options...
dave.vitesse Posted March 27, 2019 Report Share Posted March 27, 2019 Dave, Fit them they should work OK. Dave Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 27, 2019 Report Share Posted March 27, 2019 Johny, not done by me i was just shown the plugs , for all i know they could have been in for years Certainly poor running had been around for toooo long, Spark plugs life and soul of the engine sadly misguided by many. Pete Link to comment Share on other sites More sharing options...
Nick Jones Posted March 27, 2019 Report Share Posted March 27, 2019 4 hours ago, Pete Lewis said: i dont see the 'got to have one ' or why they are of any improvement ..... just seem marketing rubbish Maybe you should actually try some Pete? They are not designed for high performance, but for long life. The principle being that the spark has 3 (or 4) ways to go, takes the easiest path each time, which might be anyone of the ones available, and the erosion is split 3 (or 4) ways with commensurate increase in life. Triumphs like them. My belief is that it is because they are, in effect, side electrode plugs with the spark exposed to the chamber and not shrouded by the earth electrode. I've found their positive effect to be consistent and repeatable. Relative age of the plugs seems to be irrelevant - I first discovered this by chance having flooded a nearly new set of single electrode plugs on my 1300 Herald and the only set of dry plugs I had to hand were some Bosch three prong ones removed after 40k in our Golf GTI. I was similarly disbelieving when told that using the 3-prong Bosch plugs in the aforementioned GTI would sort out it's starting and running foibles. When I questioned this the Indy VAG specialist rolled his eyes and said "just f'ing try them - it will sort it!" It did. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 27, 2019 Report Share Posted March 27, 2019 After over 50 years of single point ...... i might be persuaded Pete Link to comment Share on other sites More sharing options...
thescrapman Posted March 27, 2019 Report Share Posted March 27, 2019 8 hours ago, Nick Jones said: Are you a convert Colin? To OP, if you must use NGK either 5 or 6 will work. 6 preferred (IMO) unless you have a bit of an oil burner. They were much harder to foul on 2 of my PI equipped cars, though I did eventually succeed. And then they cleaned up easily and worked again. Link to comment Share on other sites More sharing options...
Nick Jones Posted March 28, 2019 Report Share Posted March 28, 2019 13 hours ago, thescrapman said: They were much harder to foul on 2 of my PI equipped cars, though I did eventually succeed. Some say "good old PI......." Others tell the truth 😛 Link to comment Share on other sites More sharing options...
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