# Iridium sparkplugs?

**URL:** <https://community.cartalk.com/t/iridium-sparkplugs/63809>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, sparkplugs, 1500\
**Created:** [April 17, 2011, 11:39pm UTC](https://community.cartalk.com/t/iridium-sparkplugs/63809 "2011-04-17T23:39:02Z")\
**Posts on this page:** 1\
**Showing post:** 17

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [April 19, 2011, 7:24pm UTC](https://community.cartalk.com/t/iridium-sparkplugs/63809/17 "2011-04-19T19:24:51Z")

</div>

“It does not take less voltage to jump a .32” gap in a given fuel mixture if the electrodes are irridium rather than platinum."

It makes a difference if the electrodes are more “pointy”.  
This is covered in college level electromagnetics.  
A smaller radius of curvature creates a higher gradient in the electric field.

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