# Spark plug **URL:** \ **Category:** General Discussion\ **Created:** [March 26, 2010, 9:06am UTC](https://community.cartalk.com/t/spark-plug/46646 "2010-03-26T09:06:40Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![gowrishankar](https://avatars.discourse-cdn.com/v4/letter/g/f07891/32.png) [@gowrishankar](https://community.cartalk.com/u/gowrishankar)\ **Post date:** [March 26, 2010, 9:06am UTC](https://community.cartalk.com/t/spark-plug/46646/1 "2010-03-26T09:06:40Z")
1)what is hot tube ignition? 2)soot proof plugs? ---
**Author:** ![JoeMario](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@JoeMario](https://community.cartalk.com/u/JoeMario)\ **Post date:** [March 26, 2010, 11:21am UTC](https://community.cartalk.com/t/spark-plug/46646/2 "2010-03-26T11:21:06Z")
These were used by some manufacturers in very early engine design (like the late 1800s). Google is your friend. ---
**Author:** ![ignoramus9](https://avatars.discourse-cdn.com/v4/letter/i/d07c76/32.png) [@ignoramus9](https://community.cartalk.com/u/ignoramus9)\ **Post date:** [March 26, 2010, 6:52pm UTC](https://community.cartalk.com/t/spark-plug/46646/3 "2010-03-26T18:52:32Z")
Hmm, interesting questions, but why do you ask. Personally I never heard of either thing. Kinda makes ya wonder. ---
**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\ **Post date:** [March 26, 2010, 7:45pm UTC](https://community.cartalk.com/t/spark-plug/46646/4 "2010-03-26T19:45:37Z")
[http://www.old-engine.com/maghtu.htm](http://www.old-engine.com/maghtu.htm) [http://oz.plymouth.edu/~trentb/ModelT/T7299/T7299.html](http://oz.plymouth.edu/~trentb/ModelT/T7299/T7299.html) My wild guess with the “soot proof plugs” is that they probably had a higher operating temperature than previous plugs. ---
**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\ **Post date:** [March 26, 2010, 7:56pm UTC](https://community.cartalk.com/t/spark-plug/46646/5 "2010-03-26T19:56:09Z")
Well, that’s a bizarre coincidence! I’ve been reading a Clymer book compiling lots of old car info and ads from about 1895 to 1920, and one was from 1903 or so, for spark plugs claimed to be ‘nearly soot proof’!