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July 31, 2014, 11:28:56 AM

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Author Topic: Best Alternate Spark Plug for HOT Weather and Hot Engine....  (Read 91 times)

Bala2014

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Im currently in Tbilisi, Georgia, still heading west on our 500cc Iron Barrel.  Someone broke into our toolbox and along with a few other things took my spare plugs. 

I found this online that shows alternates for the recommended plug: http://www.sparkplug-crossreference.com/convert/NGK_PN/BR8ES

I have looked all over here in Tbilisi and havent found one of the plugs on this list.   I did find this guy though: Bosch WR7DC+ (https://www.boschsparkplugs.net/product.aspx?zpid=8149).

I was told it is similar to the recommended but colder.  All the places we will be driving through for the next months will be quite hot (90-100+ degrees) and due to some undiagnosed issues my engine is already running on the hot side.  With this in mind, what other spark plugs could I look to use?  This one I found a good alternative? There seem to be a good deal of Bosch plugs around here, some Champion, a few NGK, and a spattering of others.   
Taking the scenic route from India to Spain...8,000 miles on a classic Enfield!
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ace.cafe

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Re: Best Alternate Spark Plug for HOT Weather and Hot Engine....
« Reply #1 on: July 29, 2014, 11:40:45 AM »
If it is very hot, the slightly colder plug can help avoid detonation. It should be acceptable. I have used  B9ES in the summer, and it worked.

I would recommend using a non-resistor spark plug. The plug wire already has rf suppression resistor in it, and there is no need to have both. Using a non-resistor spark plug will help give a better spark from the coil.
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baird4444

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Re: Best Alternate Spark Plug for HOT Weather and Hot Engine....
« Reply #2 on: July 29, 2014, 07:23:44 PM »
below is from my files...
          - Mike
^^^^^^^^^^^^^^^^^^^^^^^^^^
OOPs that should be NKG spark plugs not KLG and the gobbeldygook below was
once a nice table
Subject: Re: [Enfield] Alternate spark plug numbers please...


>A KLG BR8EIX or a KLG BR8ES
> 1 Step Hotter Heat Range NGK Champion Nippon-Denso Bosh
> Standard Gap Non-Resistor B7ES N4C W22ES W5C
> Projected Gap Non-Resistor BP7ES N7YC W22EP
> Standard Gap Resistor BR7ES RN4C W22ESR WR5CC
> Projected Gap Resistor BPR7ES RN6YC W22EPR-U WR5D
> Standard Gap Platinum Non-Resistor B7EV W22ES-ZU
> Standard Gap Fine Wire Nickel Center Resistor BR7EG
> Standard Gap Fine Wire Iridium Resistor BR7EIX
> Standard Gap Fine Wire Gold Palladium BR7EV
> Standard Gap Fine Wire Platinum Resistor BR7EVX W5CP
> Standard Gap "V" Grooved Center Eletrode B7EVG
> Standard Heat Range NGK Champion Nippon-Denso Bosh
> Standard Gap Non-Resistor B8ES NC3 W24ES W4CC
> Projected Gap Non-Resistor BP8ES N6YC W24EP
> Standard Gap Resistor BR8ES RN3C W24ESR WR4CC
> Projected Gap Resistor BPR8ES RN4YC W24EPR-U
> Standard Gap Platinum Non-Resistor B8EV W24ES-V W4CP
> Standard Gap Silver Non-Resistor W4CS
> Standard Gap Fine Wire Nickel Center Resistor BR8EG W24ESR-V
> Standard Gap Fine Wire Iridium Resistor BR8EIX IW24
> Standard Gap Fine Wire Gold Palladium BR8EV
> Standard Gap Fine Wire Platinum Resistor BR8EVX WR4CP
> Standard Gap "V" Grooved Center Eletrode B8EVG W24ES-ZU
> 1 Step Colder Heat Range NGK Champion Nippon-Denso Bosh
> Standard Gap Non-Resistor B9ES N2C W27ES W3C
> Projected Gap Non-Resistor BP9ES W3D
> Standard Gap Resistor BR9ES RN2C W27ESR-U
> Projected Gap Resistor BPR9ES RN57YCC
> Standard Gap Platinum Non-Resistor B9EV
> Standard Gap Silver Non-Resistor W3CS
> Standard Gap Fine Wire Nickel Center Resistor BR9EG W27ESR-V W3CP
> Standard Gap Fine Wire Iridium Resistor BR9EIX IW27
> Standard Gap Fine Wire Platinum Resistor BR9EVX W3CP
> Standard Gap "V" Grooved Center Eletrode B9EVG W27ES-ZU
> Standard Gap Fine Wire Nickel Center NON-Resistor B9EG W27EN
> 2 Steps Colder Heat Range NGK Champion Nippon-Denso Bosh
> Standard Gap Non-Resistor B10ES W2C
> Projected Gap Non-Resistor BP10ES W2D
> Standard Gap Silver Non-Resistor W2CS
> Standard Gap Fine Wire Nickel Center Resistor BR10EG W29ESR-V
> Standard Gap Fine Wire Iridium Resistor BR10EIX IW29
> Standard Gap "V" Grooved Center Eletrode B10EVG W29ES-ZU
> Standard Gap Fine Wire Nickel Center NON-Resistor B10EG W29ES-V
>
> Simon in Oz
^^^^^^^^^^^^^^^^^^^^^^^
Super cheepo iggerant badly informed dodos use BP
8 ES and the same plug for may years and kick a
whole lot. -Too cold/hard.
Ordinary but well informed cheepo's buy BP 6 ES (BP 7 ES) and kick less
Myself I go for NGK BP 6 ET (BP7ET eller BCP7ET) spend more but kick even less.

If you want a really good plug that outlasts your oil many times -get;
NGK BP 6 EVX (BP7EVX) Platinum and
If you want the BEST EVER; the over-the-top super
performer all my friends in Sweden are raving
about now -the NGK BPR 6 EIX (BPR7IX) IRIDIUM
plug multi-electrode. It's not for free! But with
a plug like that you snap your fingers and the
bike starts! -Well pretty close to that
anyway...it solves many annoying "almost"
problems related to fuel/air mix and so-so
electrix. Clears up the last annoying coughs and
spits in an otherwise well running engine. A
cleaner burn.

BTW The # 7 are for racey Speedy Gonzo's and the
faster, harder driving and the # 6 for us modest
clunkers that doesn't have to prove anything to
anyone. If you do both get both plugs and swap
them as the need arises. Full day almost flat out
put the7 in, slow poking around in town all week
at 50 km/h put the 6 in. And live happily ever
after.

My friend Martin Sf put the list together with the NGK people's help.

BTW 2 these plugs are for 500cc and 535 only, NOT 350cc!!!

Jan
--
^^^^^^^^^^^^^^^^^^^^^^^^^
To check if the plug is the correct heat range for the speed at which
it is driven, look to the earth strap, the bent bit...
You will probably need a new plug, or clean the old earth strap back to
clean bright metal.
The ideal is the see a marked heat-band discolouration on the earth
strap, half way between tip and the shell of the plug.
If the plug is too cold and too much heat is being drawn away, the heat-
band will be closer to the shell. If the plug is too hot, the heat band
will be closer to the end
If your ignition timing is over-advanced, the very tip of the central
electrode will be erroded and rounded, maybe a mm or so down the tip.
Again, a new plug is really the only way to check.

Tim
N.Z.



"You can't drink all day if you don't start in the morning!! "
        -Cody Baird
'My dear you are ugly,
 but tomorrow I shall be sober and you will still be ugly'
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Arizoni

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Re: Best Alternate Spark Plug for HOT Weather and Hot Engine....
« Reply #3 on: July 29, 2014, 09:35:54 PM »
I am not disagreeing about the colors on the bent earthing strip being an excellent indicator of whether the motorcycle is running rich or lean but I think it has little to do with how "hot" or "cold" the sparkplug is running.

The various "heats" of a spark plug is controlled by the length of the ceramic center body insulator which does not contact the earthing strip.
By "length" I am talking about the distance the center body extends down into the spark plug before it makes contact with the outer metal shell that screws into the cylinder head.

A "cold" spark plug has a very short ceramic center body.  This short ceramic body conducts the heat away from the tip of the center electrode to the metal shell rapidly, keeping it cooler.  Although this can result in more carbon building up on the center electrode, it keeps the tip cooler resulting in less of a chance of pre-ignition of the air/fuel charge.

A "hot" spark plug has a long ceramic center body which goes a long way down into the metal shell before it makes contact.  Being long, the tip of the center electrode gets much hotter resulting in burning off any carbon deposits that wish to build up on it.
The increased heat can lead to pre-ignition of the air/fuel charge if the "heat" is excessively hot.
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

Bala2014

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Thank you for the tips.  Im going to head out today and see what I can find.  On a sidenote, any oil recommendations for extreme hot weather other than SAE 20/50?
Taking the scenic route from India to Spain...8,000 miles on a classic Enfield!
www.thescenicroutethroughlife.com