RogerH Posted September 23, 2014 Report Share Posted September 23, 2014 Hi Folks, just received some NGK spark plugs from ebay. For my 4A I need BP6HS plugs. What arrived today are BP6HS-10 (6326). Does anybody know the signficance of the '-10'. Are they the same plug.? Roger Quote Link to post Share on other sites
Kevo_6 Posted September 23, 2014 Report Share Posted September 23, 2014 Hi Roger Just had a look at my NGK symbols list and the 10 denotes pre set spark gap of 1.0mm. Hope this helps. Quote Link to post Share on other sites
Rodbr Posted September 23, 2014 Report Share Posted September 23, 2014 Hi Roger, Seems to be a gap difference NGK 7331 BP6HS Standard Plug 0.7mm 0.028" NGK 6326 BP6HS-10 Standard Plug 040" (1.0mm) Otherwise they appear to be the same plug in all other respects. rgds ROD Quote Link to post Share on other sites
RogerH Posted September 23, 2014 Author Report Share Posted September 23, 2014 Aren't they adjustable Roger Quote Link to post Share on other sites
AlanT Posted September 23, 2014 Report Share Posted September 23, 2014 They probably are adjustable Roger, but these days people try to avoid the huge amount of work associated with jobs like adjusting a plug-gap. Quote Link to post Share on other sites
tim hunt Posted September 23, 2014 Report Share Posted September 23, 2014 Yes Roger, the number at the end of the NGK plug part number refers to the spark gap in tenths of one mm so -9 is 0.9mm, -10 is 1.0mm, -11 is 1.1mm and -13 1.3mm. In real money of course 1.0mm is forty thou, quite a bit higher than the 25 thou book figure for 4A plugs. I run NGK BP6HY (V-grooved centre electrode) in my car with a 40 thou gap with good results. I have 123 Ignition, a sports coil and very low loss HT leads and believe the wider gap gives a bigger spark for faster ignition but what do I know. The full coding explanation for your plugs is as follows: B 14mm thread diameter P Projected insulator nose type 6 Heat rating (the lower the number the hotter the plug) H 12.7mm thread reach S Standard type construction Tim Quote Link to post Share on other sites
RogerH Posted September 23, 2014 Author Report Share Posted September 23, 2014 Thanks chaps. Isn't it amazing all the stuff we need to know and the fact that somebody knows it. I shall adjust the gap to 0.625mm - I hope it doesn't invalidate the warranty. Roger Quote Link to post Share on other sites
MikeF Posted September 24, 2014 Report Share Posted September 24, 2014 Don't forget to use a metric hammer:)Mike Quote Link to post Share on other sites
Peter Cobbold Posted September 24, 2014 Report Share Posted September 24, 2014 And the little cardboard cylinder they come with is to stop the preset gap closing up during carriage. Supposedly. Quote Link to post Share on other sites
LGFromage Posted September 24, 2014 Report Share Posted September 24, 2014 Roger, Beware of ebay sourced spark plugs as they may be counterfeit. They work for a short time then give up, so if you have trouble check them first before doing anything else. It will save a lot of time. Tim. Quote Link to post Share on other sites
monty Posted September 26, 2014 Report Share Posted September 26, 2014 I get the genuine items BP6HS from APD motor factors @ a very good price that is comparable to anything else on EBay. Quote Link to post Share on other sites
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