Spark plugs, E85 and boost

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May 16, 2011 | 05:59 AM

FakeSnake

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Spark plugs, E85 and boost

I was thinking about this the other day and it got me wondering. when running 93 octane and boost it is the general consensus to run a colder plug to prevent detonation and since E85 is prone to this due to its higher octane would one be able to run say factory type plugs and not have to worry about pre-ignition or is it also recommended to go 1 or 2 heat ranges colder?

May 16, 2011 | 07:03 AM

93formto98T/A

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You still need to go colder. I had issues with the plugs blowing out on my last dyno session due to not running a colder plug w/e85.

May 16, 2011 | 12:48 PM

JAX04

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From: Indy

Quote:

Originally Posted by FakeSnake

I was thinking about this the other day and it got me wondering. when running 93 octane and boost it is the general consensus to run a colder plug to prevent detonation and since E85 is prone to this due to its higher octane would one be able to run say factory type plugs and not have to worry about pre-ignition or is it also recommended to go 1 or 2 heat ranges colder?

Thought it was the other way around

EDIT: From things ive read, E85 is more prone to PRE-Ignition. However, pre-ignition often leads to detonation and failure.

EDIT 2: Also, running a colder plug seems to be the best answer

Last edited by JAX04; May 16, 2011 at 01:01 PM.