Allis c spark plugs
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Category: Allis Chalmers
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=30115
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Topic: Allis c spark plugs
Posted By: ymhajoe
Subject: Allis c spark plugs
Date Posted: 02 May 2011 at 11:30am
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I have an AC-C . When I bought it it had J11C champion plugs in it, but I just got a manual and see that J11C is for low octane and j8 is for gasoline. Does anyopne know the difference in the two and which I should be running. Thanks, Joe
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Replies:
Posted By: Brian Jasper co. Ia
Date Posted: 02 May 2011 at 11:40am
Throw those Champions away and use AC Delco R45 if it has a distributor or Autolite 295 if it has a mag.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: Coke-in-MN
Date Posted: 02 May 2011 at 11:44am
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J 11C : http://www.championsparkplugs.com/results_fitment.asp?pid=J+11C - http://www.championsparkplugs.com/results_fitment.asp?pid=J+11C
J 8C : http://www.championsparkplugs.com/results_fitment.asp?pid=J+8C - http://www.championsparkplugs.com/results_fitment.asp?pid=J+8C
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Posted By: Coke-in-MN
Date Posted: 02 May 2011 at 11:47am
Heat range
The term spark plug heat range refers to the speed with which the plug can transfer heat from the combustion chamber to the engine head. Whether the plug is to be installed in a boat, lawnmower or racecar, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. When it is within that range it is cool enough to avoid javascript:glos%28Pre%2Dignition,2,1%29 - pre-ignition and plug tip javascript:glos%28Overheating,2,1%29 - overheating (which can cause engine damage), while still hot enough to burn off combustion javascript:glos%28Deposits,2,1%29 - deposits which cause javascript:glos%28Fouling,2,1%29 - fouling .
The spark plug can help maintain the optimum combustion chamber temperature. The primary method used to do this is by altering the internal length of the core nose, in addition, the alloy compositions in the electrodes can be changed. This means you may not be able to visually tell a difference between heat ranges. When a spark plug is referred to as a “cold plug”, it is one that transfers heat rapidly from the firing tip into the engine head, which keeps the firing tip cooler. A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter.
An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as a turbo, supercharger, increase compression, javascript:charglos%28Timing%29 - timing changes, use of alternate fuels, or sustained use of javascript:charglos%28Nitrous%29 - nitrous oxide, these can alter the plug tip temperature and may necessitate a colder plug. A rule of thumb is, one heat range colder per modification or one heat range colder for every 75–100hp you increase. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber.
The heat range numbers used by spark plug manufacturers are not universal, by that we mean, a 10 heat range in Champion is not the same as a 10 heat range in NGK. Some manufacturers numbering systems are opposite the other, for Champion, the higher the number, the hotter the plug. For other manufacturers (NGK, Denso, Bosch), the higher the number, the colder the plug.
Do not make spark plug changes at the same time as another engine modification such as injection, carburetion or javascript:charglos%28Timing%29 - timing changes as in the event of poor results, it can lead to misleading and inaccurate conclusions (an exception would be when the alternate plugs came as part of a single pre-calibrated upgrade kit). When making spark plug heat range changes, it is better to err on the side of too cold a plug. The worst thing that can happen from too cold a plug is a fouled spark plug, too hot a spark plug can cause severe engine damage
http://www.championsparkplugs.com/charglossary.asp?kw=Heat+range - http://www.championsparkplugs.com/charglossary.asp?kw=Heat+range
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Posted By: ymhajoe
Date Posted: 02 May 2011 at 8:31pm
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Why should I throw them away? What is different about them. I pretty sure it has had j11c champion plugs in it for the last 20 years. Thanks for the interest,Joe
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Posted By: Brian Jasper co. Ia
Date Posted: 02 May 2011 at 10:33pm
Champion's quality is not what it once was. If the old plugs are still useable and it runs good, might as well leave them. In the late 80's when I worked on lawnmowers, I had a whole box of Champion plugs come back defective. Since then, I don't use them in anything.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: Brian Jasper co. Ia
Date Posted: 02 May 2011 at 10:34pm
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Low octane fuel needed a hotter burning plug to reduce fouling.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: junkman
Date Posted: 02 May 2011 at 10:36pm
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I to have had a many bad experience with Champion's. i never use them anymore.
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Posted By: Dakota Dave
Date Posted: 03 May 2011 at 12:54am
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Champions are the only plug I can get at the local hardware store. to get NGKs or Autolites I need to drive 45 miles to town and 45 miles back. I use champions. In my oil burning plug fouling C they are the only plugs to use. for some reason you can clean a champion many times and it will keep working. once you foul a autolite or NGK you might as well throw it away. AC 45s were great plugs but AC R45s are not a good plug.
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