hot plugs vs. cold plugs

B

BoatBuoy

Rear Admiral
Joined
May 29, 2004
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4,856
This is a spin-off inspired by a thread on Johnson/Evinrude forum. What exactly is the difference in hot vs. cold plugs. I mean, they both get the same voltage; the recommended gap is the same with both, timing is the same. What exactly is the difference? Inquiring minds need to know these things, like, why do they have Interstate highways in Hawaii, if the Krystal is open 24hrs, why do they have locks on the doors?
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: hot plugs vs. cold plugs

The heat transfer path from electrode to engine block is longer in "hotter" plugs, so the tip stays at a higher temp. Plug temp is VERY important to an engine performing as the engineers intended.<br /><br />The "Interstates" in HI are built to the same specs as interstate highways on the continent, and they are funded by the Fed. That's why they are called Interstates.<br /><br />If the Krystal has to be evacuated in an emergency or closed for repairs they need to lock it up.
 
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