Re: Spark plug brand?

Posted by sotxbill on August 19, 2019 at 18:21:56 from (104.5.24.112):

In Reply to: Spark plug brand? posted by rrman61 on August 18, 2019 at 19:03:29:

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Mark,

Not picking on champion in general, but I have a plug tester... actually I have 4 plug testers, all the same general type. AND...

Testing plugs out of the box, you slowly add air pressure as you watch the plug fire, while looking through the window. Bad plugs will fire at no pressure or low pressure. Only good plugs will fire at high pressure. Some plugs are rated to fire at extra high pressure, all based on the books and specs from the 60s and 70's. High voltage ignition fix this problem on new cars but did NOT fix this on older or standard engines.

NOW.. back to motorcycles with high compression... the so called american brands all test poorly over 120 lbs of compression while nd and ngk all test perfect. The got into jet skis, wet bikes, etc,, same story,, no american plugs would work. built hot rods with slightly higher compression. testing ""american"" plugs... most all of the AC brand plugs passed say 90%..... Autolite, around 75% passed at 125 lbs.. Champions, only 50% passed or fired at 125 or above.. on an engine that was running 125 to 135 lbs of compression.

NOW.. this was on the shop plug tester. I dont know if it had solid wires but I suspected it did. I dont know how the coil was set, but it was pre- high voltage ignition. And the same tester tested all the plugs.

Now I have 4 of the old Ac or champion plug testers That I have collected and cleaned up over the years in my shop, along with the 14 honda motorcycles, jet skis and 13 to 25 tractors depending on time of year and how mad my wife is at all the junk in the barn. I still test plugs and these same factors still apply. Any thing with either higher compression,, or anything with a weaker spark.... will really be sensitive to the plug condition. And now that most plugs are made in china, they are not any better, but actually test with more failures. The other days on a new package of 4 plugs, one failed badly and would not fire at 100 lbs., the other 3 fired well up to 120 lbs +- a few lbs. So yes, what most folks are saying her is correct about some brands being better. Again,, based on how much spark(voltage) and how much compression, you can see a huge difference.

Question to you.. how often is the compression over 115 lbs????

Replies:

• Re: Spark plug brand? Leroy 07:25:36 08/20/19 (0)
• Re: Spark plug brand? MarkB_MI 21:14:13 08/19/19 (0)

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