Morris Minor Owners Club

Bought some NOS Champs, but I note they are RBN9-Y as opposed to the specified N9-YC.

Can anyone please tell me what car these were meant for or whether they are just a 'hot' plug.

Still, at 20p apiece I'm not complaining...

the R = built in resister to cut out /down radio /tv interference ,they are ok to use

Thanks for the info, they are also a lot thinner than N9Y-C's which is why I wondered but as long as they are OK to use.

hang on I've just noticed the B,
JUST DOUBLE CHECK THE PLUG DIMENSIONS

http://www.gsparkplug.com/shop/media/im ... ampion.gif
CHECK THIS SITE

Thinner??? As long as they are 14mm plugs they will be fine. BUT - if you have resistor leads AND resistor plugs you may have starting problems when cold...... I run N6Ys in my engine. Sometimes known to oil up when starting from cold..

From pictures of the Champion plug, I think you will find that they have a conical seat, which is not suitable for an A-Series head - they need the ordinary flat seat and compressible washer. They appear to be the same spec as an NGK BPR6EFS, which is broken down into the following characteristics (also has a conical seat):

B - 14mm dia thread, 20.8mm AF hex
P - Projected Insulator Type
R - Resistor Type
6 - Heat Range - Medium
E - 19mm thread reach
F - Conical seat
S - Copper core centre electrode

Ahh - explains the C then.......and yes no use on an A series in that case... Back on ebay with them.......

The plot thickens. Having examined them more closely, these RBN9Y plugs are much thinner than 14mm, but the thread is the same so they can be screwed into the head. This must've been what confused me in the first place.

Regarding the N9YC plugs I have, comparing them with a normal N9Y, the washers and seats are both flat, Richard, so I am curious as to which plugs were meant for what engine.

As long as they will fit I suppose it's just a matter of testing whilst I drive. Apart from the RBN9Y's of course.

If flat seats with washers - and 14mm thread - use them!

Roy
they are 1.5 mm longer,will this make a difference?apart from altering the timing by a knats eyeball?

The N9YC are the copper cored version of the N9Y, so is the same basic spec, heat range etc. Both are perfect for the Minor.

The length maybe means a better ignition of the mixture - BUT - interestingly, Racing Plugs are NOT extended nose as these are. If they fit - they will be fine, but beware the double resistance of leads + plugs.....

Thanks chaps for the info.