spark plugs

[rocket]

Morning,just been to buy new plugs,was after my usual bp6es but only found bp6e...are these the same? if so whats the missing s for? Was also some interesting looking bp6et types..

[neilsjuke]

http://www.ngkntk.co.uk/working/FileLib ... alogue.pdf

neil

[rocket]

Thanks for that,id flicked through it before but it doesnt answer my ? what does the s mean and is it important?

[nebogipfel]

If you look at page 73 in the catalogue Neil has given the link for, it explains all the numbers, letters and just about everything you could ever want to know about NGK plgs.

[rocket]

Maybe i need to rephrase my ? The info i require isnt,or i cant see it anyway in the link supplied..Do any twincam owners fit bp6e plugs or is it neccesary to fit bp6es?

[CBUEB1771]

Do any twincam owners fit bp6e plugs or is it neccesary to fit bp6es?

"S" indicates a copper center electrode and most people I know who use NGKs in a Twin Cam choose the BP6ES. The copper center electrode may not be necessary but it is the most popular choice in my experience.

[rocket]

Well iv popped them in,gone for a run and pulled plugs..look fine ,runs as well as before,which is well...having delved a little deeper it seems maybe the difference is that these have a v groove centre..lovely day to play with car anyway..

[NORTHWALES+2]

I note that most of the parts suppliers list the plug as a BP7ES and not BP6s, The NGK catalogue also lists the BP7ES, I am missing a trick here, what are the benefits of using BP6's is it a hotter running plug?

[rocket]

I find the 6 runs just right,when i ran on 7s i found the lugs prone to fouling up after a time tho not to badly.I would say that if your car runs well then stay as you are though.

[CBUEB1771]

The NGK catalogue also lists the BP7ES

The Elan and Elan +2 workshop manuals specify Champion N7Y plugs for non-emission control engines. NGK show the BP7ES as the best cross-reference to the N7Y. In my +2, converted to non-emissions control specification, the N7Ys were a bit too cold and somewhat prone to fouling. The slightly hotter N9Ys were better and NGK's closest cross-reference in this case is to the BP6ES. For many years I have used Bosch W7DC with good success. I prefer the Bosch plugs because the thread form is very clean and does no damage to the head with proper torquing. The W7DC is in the same heat range as the BP6ES and N9Y. At the end of the day the the choice will be made by how you drive, the octane rating of fuel you use and the condition of your engine. If you routinely push the car hard, use high octane fuel and have good rings and bores then the colder plugs are probably better. I don't push my +2 very hard so the hotter plugs work best for me.

[cliveyboy]

Myself and various other owners use BP6ES plugs but also modify the engine breather so it does not vent into the air box.
(by number 4 cylinder) The plugs stay much cleaner.
I have used BP6ET plugs with some success . They kept the plugs cleaner for slightly longer (untill I modified the engine breather).
Clive

[rocket]

I looked at the et type Clive but dismissed them as to modern looking...iv done 300 mile on bp6e and they look fine,engine runs well to.I thought about rerouteing breather pipe but to be honest i dont have a problem with plugs fouling so i shall leave well alone for now.

Ian.