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Re: Spark Plugs
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Posted by IHank on March 07, 2000 at 20:08:09 from (167.142.19.25):
In Reply to: Spark Plugs posted by Shadetree Mechanic on March 07, 2000 at 16:51:33:
Shade Tree- Yes, there is a top end to the good thing. Les Repair gets you into it. Recommend dig out an old Motor or Chilton repair manual and read up on spark plug heat range. Champion back in the sixties had a "U prefix" line of spark plugs. They had a 0.050" "booster gap" built into the upper part of the center electrode. They'd fire thru anything and when they stopped working there'd be just a big blob of crud hanging out of the firing end of the plug. Supposedly, they were dropped because that extra spark gap radiated lots of radio frequency interference and violated a sub-section of the Communictations Act of 1958, the law that gave us resistor wires and plugs- and greased the skids for political meddling with automotive designs. This trick is told in the 1914 Model T Ford operator manual and is nothing new as to technical developments. It is also the substance of many "spark intensifyer" gadgets sold at/by the state fairs and automotive after market mail order firms. A techno follow up from that was the projected core nose plugs- the "Y" letter suffex on many common part numbers. That projected ceramic core ran very hot, but got a flash chill by being "way out in the breeze" of each incoming fuel/air charge. Their heat retention helped keep 'em burned clean. For example- If you had a set of UJ-18Y Champions they'd probably still fire after the worn out engine they were in expired and the oil fields were dry. Put an HEI system on the front end and you could fire a rusty nail in a bucket of water! Dig out those old repair manuals. They contain a wealth of tecchie info for people now-a-days. Hardware designs change, but the chemistry & physics don't! IHank
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