The main difference between hot and cold plugs? - VTXOA
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post #1 of 11 (permalink) Old 04-22-2019, 10:54 PM Thread Starter
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The main difference between hot and cold plugs?

Let me preface by saying I know this is probably a question that has been asked before but I could not find it in the threads so my apologies if this is one of the repetitive ones.
What is the exact difference between hot and cold plugs and what's the advantage or disadvantage in using it in my 1800 C?
I am currently running the OEM NGK iridium. I don't mean to start the whole what is the best spark plug debate but I just wanted to know the main differences between the two in my specific application?
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post #2 of 11 (permalink) Old 04-23-2019, 12:17 AM
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It really is hot or cold. It is the temperature of the plug too hot and you can have premature fire to cold and the plug may not work with your engine properly and can get fouled easier. It does not have anything to do with the spark. It can also affect the timing of the burn.The stock plugs work very well, that is any thing after 2002 or 2003 when the changed the plugs.

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2016 Versys 1000

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post #3 of 11 (permalink) Old 04-23-2019, 08:18 AM
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Question already answered on another forum.
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Last edited by cyclejohn; 04-23-2019 at 08:26 AM. Reason: Question already answered on another forum
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post #4 of 11 (permalink) Old 04-23-2019, 08:23 AM
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Cold Spark plugs transfer more heat from the center electrode to the shell than Hot spark plugs(less heat transfer-center electrode is hotter)

2002 1800 standard use spark plug was cold - fouled often

2003 and up standard use spark plug was one step hotter, worked well.

Bareasschoppers https://tech.bareasschoppers.com/eng...-the-vtx-1800/

A doc with 8" x 10" color glossy photographs!
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post #5 of 11 (permalink) Old 04-23-2019, 09:38 AM
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.
it was so much easier to "Read" spark plugs.. with leaded gas..
,
just saying.... another bit lost to history..



2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #6 of 11 (permalink) Old 04-23-2019, 10:08 AM
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Exactly as Hans describes. A hotter plug, because it transfers less heat away from it's center electrode will remain hotter as the engine runs. The benefit is that carbon deposits will burn off. The down side is that if the plug is too hot it will ignite the air/fuel charge prematurely. Way to hot and the end melts off. Yup, I've seen that.



A colder plug will hold on to more contamination. Sometimes this isn't a problem, especially in very clean burning engines. And without concern for pre-ignition due to a hot spark plug, timing advancement and lean burn can be further pushed to limits. It is a balancing act.



Here is a pretty good picture;





From every other respect the plugs can be identical, but for the amount of heat allowed to escape.
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post #7 of 11 (permalink) Old 04-23-2019, 10:38 AM
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Quote:
Originally Posted by Harkon View Post
Exactly as Hans describes. A hotter plug, because it transfers less heat away from it's center electrode will remain hotter as the engine runs. The benefit is that carbon deposits will burn off. The down side is that if the plug is too hot it will ignite the air/fuel charge prematurely. Way to hot and the end melts off. Yup, I've seen that.



A colder plug will hold on to more contamination. Sometimes this isn't a problem, especially in very clean burning engines. And without concern for pre-ignition due to a hot spark plug, timing advancement and lean burn can be further pushed to limits. It is a balancing act.



Here is a pretty good picture;





From every other respect the plugs can be identical, but for the amount of heat allowed to escape.



I remember something like that drawing... from shop class...
< never mind what year>
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2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #8 of 11 (permalink) Old 04-23-2019, 10:56 AM
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Quote:
Originally Posted by chuck_VTX F View Post
I remember something like that drawing... from shop class...
< never mind what year>
LOL ...



It doesn't really matter what year Chuck. Spark plugs still do the same job the same way. They have some that last longer now and ones with all sorts of fancy multiple ground electrodes, built in capacitive discharge and energy boosting do-dads and whatnot. All they do is spark, same as they always have. Pistons still go up and down, cranks still go round and round, spark plugs still just spark.



Ever been dismissed as an old timer that doesn't fully understand the modern complexities of today's engines? I have (I was never a trade mechanic though), but the young techs today only know what the ECU tells them. If it doesn't point to a fouled plug on number 2, they'd never find it. The techs that enjoy classic cars and old motorcycles, they seem to get it.
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post #9 of 11 (permalink) Old 04-23-2019, 02:37 PM
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Roger that Sir

1 cylinder to 12...

1 cubic inch to 502....

same principles.

these hands have worked on them all...
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2005 VTX1800 F, type II, Silver Tribal, 86,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #10 of 11 (permalink) Old 04-23-2019, 03:22 PM
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Here you go Chuck, a spark plug from a few years ago vs my VTX spark plug.

20 seconds to find the dead cylinder before the exhaust manifold got to hot to touch..
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File Type: jpg 20190423_151731.jpg (196.1 KB, 7 views)
File Type: jpg 20190423_151815.jpg (198.3 KB, 7 views)
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Last edited by Hans&Feet; 04-23-2019 at 03:24 PM.
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