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MG Midget and Sprite Technical - Spark plug query & Progress report!

Hi All
Thanks to you all for your recent advice on a couple of questions on my resto of my mk III 1275. She now bursts into life - YAY ! - ( i.e. she start on the key).
As she is now going, I thought I would get some new plugs- halfords only sell Bosch plugs as equivalent to the Champion n9y in my midget at the moment - are they OK? or should I sttay with the Champions?
She also doesn't have hazard lights fitted and I think these are a good idea- has anyone tried any of the kits on offer from the web or ebay? all
colin
cheers
c frowen

IMO I and many others only buy the best and they are???

NGK BPR6ES

You can not buy a better plug. Try your local Partco!
Robert (Bob) Midget Turbo

Another vote for NGK
Dave O'Neill2

NGK for me too. Bedst you can get.
Dave
Dave Brown

NGK without a doubt....!

Mark.
M T Boldry

NGK here too

Partco is trading as Unipart these days

I use the Brum brach often for good service and decent prices

Bill1

If you prefer BP7ES this price takes some beating. http://www.ebay.co.uk/itm/NGK-bp7es-sparkplug-brand-new-/330632593782?pt=UK_Motorcycle_Parts&hash=item4cfb3d0176
£6.40 delivered.
F Pollock

Would use BP6ES unless you are running a very highly tuned engine.... where BP7ES may be better.

Mark.
M T Boldry

I use NGK too.

However, I have questions about the newer resistive types.

If you use resistive caps (mine are bosh suppressor caps), how detrimental is it to also use resistive plugs?

More resistance lengthens the time taken for the coil to discharge, reduces spark, and presumabely also interferes with the iognition timing.

I've got BP6E in mine. The alternative is BP6ES (I assume the S is suppressed).

Bob cites the BPR6ES. I think the R is the lates ceramic resitive type.

Can someone please discuss the relative merits and demerits of each?
Lawrence Slater

At Aldon on the weekend, they suggested that I replace my NGK BP7ES with NGK BPR7ES due to having electronic ignition fitted. Although I now have the plugs, they are yet to be fitted. Can someone explain to a numpty like me how and why the resisted plugs work better on engines with electronic ignition.
Gary & Gaps

Did you not ask the guy that suggested you change them? :-D

My WAG would be that it would limit interference that the ECU might be sensitive too.

OrangeSpyderMan

I've found it difficult to get a steady strobe reading without resistor leads. My pertronix showed about 10 degrees 'scatter' on solid copper core wires which meant it was impossibe to time in. Rolling road guys often swap to resistor leads as unsuppressed copper leads with electronic ignition give erroneous signals . For me a change to silicon leads (with ordinary BP7ES plugs) gave a steady reading.
F Pollock

OK NGK

BPR6ES
B= thread size 14mm
P= projected nose insulator
R= Resistor
6= Heat range (6 normal)
E= length of thread
S= Super Copper tipped

I have used Vs when racing which were platinum tipped but did not find any benefit.

I too heard Aldon suggest that resistor plugs ought to be used for electronic ignition. I asked James why he thought that was and like me he was not sure and he agreed that we simply used them many years ago for suppressing radio interference. :)

I nowadays take the view that I always use resistor plugs unless I have a good reason not to!
Bob Turbo Midget England

Thanks bob. I thought the S stood for suppressed.

So is there any implication in using suppressor caps as well as Resistive plugs BPR6ES?

Or should it be just one or t'other?

Lawrence Slater

This thread was discussed between 20/11/2011 and 21/11/2011

MG Midget and Sprite Technical index

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