SAR Massive irregular misfire

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Jon69
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SAR Massive irregular misfire

Post by Jon69 » Wed Aug 26, 2020 10:01 pm

Your Japanese plug is marked BP6ES and the French plug is marked BPR6ES. I presume there is a difference but can someone explain?



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SAR Massive irregular misfire

Post by AJL Electronics » Wed Aug 26, 2020 10:14 pm

One has integral resistor, the other doesn't.


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SAR Massive irregular misfire

Post by MikeyBikey » Wed Aug 26, 2020 10:34 pm

Glad you got it sorted Geoff. Coincidentally, I watched an American YouTube video on counterfeit plugs bought from amazon, only a couple of weeks ago! The quality of the copy was excellent, but the quality of the plug itself was not. It was the plug manufacturer who confirmed the correct one and the copy, but to a layman was almost impossible to tell the difference.


Is we sideways yet...

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SAR Massive irregular misfire

Post by MikeyBikey » Wed Aug 26, 2020 10:49 pm

Wow, another coincidence, just posted on a Facebook forum. Not saying it’s a copy but it’s an impressive fail
85B110AA-8911-4E3A-9BF2-EF2C03A0C6F3.jpeg
85B110AA-8911-4E3A-9BF2-EF2C03A0C6F3.jpeg (222.28 KiB) Viewed 506 times


Is we sideways yet...

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SAR Massive irregular misfire

Post by willholderogri » Thu Aug 27, 2020 6:54 am

It's also possible that NGK quality control may be a bit lax these days


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SAR Massive irregular misfire

Post by DARK STAR » Thu Aug 27, 2020 11:04 am

They look as if they have been in the engine for about 50 years.


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Old and Slow
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SAR Massive irregular misfire

Post by Old and Slow » Thu Aug 27, 2020 1:30 pm

Interesting;
The original is a BP6 and the replacement is a BPR6 (i.e. in-built resistor).
On another thread I read this:
using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion. :?

Looks like we all need to fit the resistor version in future.


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SAR Massive irregular misfire

Post by AJL Electronics » Thu Aug 27, 2020 2:19 pm

Old and Slow wrote:
Thu Aug 27, 2020 1:30 pm
Looks like we all need to fit the resistor version in future.
Not messy celery.

The reason that the two types exist is the variance in HT leads. If you have the carbon string type that were popular once, then you use non resistor plugs. If you have wire HT leads, then resistor plugs are required.


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SAR Massive irregular misfire

Post by adamwilkes » Thu Aug 27, 2020 3:18 pm

My 'Powerspark' HT leads have a "carbon ferroflex core " - does that mean they are carbon, so do not use 'R' spark plugs? I currently have NGK BPR6ES plugs :shock:


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SAR Massive irregular misfire

Post by AJL Electronics » Thu Aug 27, 2020 3:21 pm

Measure the resistance of the leads. About 15K is what you would expect from carbon string.


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SAR Massive irregular misfire

Post by philhoward » Thu Aug 27, 2020 3:31 pm

I can never remember if it's 10k per foot or per metre..must be 10k/foot then :mrgreen:


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SAR Massive irregular misfire

Post by willholderogri » Thu Aug 27, 2020 3:52 pm

Bp6es it's the only ones I will use


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SAR Massive irregular misfire

Post by adamwilkes » Thu Aug 27, 2020 6:15 pm

willholderogri wrote:
Thu Aug 27, 2020 3:52 pm
Bp6es it's the only ones I will use
So, my HT leads are carbon leads (5K Ohms for a spare short coil lead that came with the new set); do I change the leads for copper ones, or change the 'plugs for non-resistor ones?


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SAR Massive irregular misfire

Post by willholderogri » Thu Aug 27, 2020 6:33 pm

adamwilkes wrote:
Thu Aug 27, 2020 6:15 pm
willholderogri wrote:
Thu Aug 27, 2020 3:52 pm
Bp6es it's the only ones I will use
So, my HT leads are carbon leads (5K Ohms for a spare short coil lead that came with the new set); do I change the leads for copper ones, or change the 'plugs for non-resistor ones?
I mostly use copper leads and bp6es never failed yet I'm not a lover of introducing resistance in a ht system . It was mostly done to reduce interference with analogue transmissions .these days most transmissions TV and radio are digital .


1962 mini, bedford CA , KR200. morris 1000, mini pickup.several escorts,ford grandad.ford cortina X2 ,astra, SE5A x 2 ,ford focus.

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SAR Massive irregular misfire

Post by AJL Electronics » Thu Aug 27, 2020 6:49 pm

willholderogri wrote:
Thu Aug 27, 2020 6:33 pm
I mostly use copper leads and bp6es never failed yet I'm not a lover of introducing resistance in a ht system . It was mostly done to reduce interference with analogue transmissions .these days most transmissions TV and radio are digital .
Even if you weren't wrong, what difference does the modulation method make? RF is RF.


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