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From: W Atkinson <Walter@advancedpilot.com>
Subject: Re: [LML] Re: EGT's on O-360
X-Original-Date: Sun, 13 Feb 2005 15:56:10 -0600
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Scott:

**Electronic ignitions and "fine wire" plugs each can also reduce EGT 
temps and, as I have both,**

Could you postulate WHY or HOW that can happen?  I know of no reason 
and have never noticed:

A) ANY change in EGT with massive vs. Fine wire plugs.  Test data does 
not confirm the claim.

B) ANY change in EGT based on what generates the spark.  Test data does 
not confirm the claim.

To get a lower EGT, you MUST have the spark advanced.  That will not 
result in a better situation.

The TIMING of the spark event is what will alter the EGT, not the 
intensity of the spark or where it comes from or through what type of 
plug.  Until someone comes up with a plausible scientific explanation 
of how the source of the spark can alter the EGT and can show test data 
to confirm it, I don't believe it.  The physics is still everywhere the 
same.  If you are getting lower EGTs, the spark is occurring EARLIER.  
Period.  That will result in higher ICPs and decreased durability.

Walter
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Scott:


**<fontfamily><param>Arial</param><smaller>Electronic ignitions and
"fine wire" plugs each can also reduce EGT temps and, as I have both,**


</smaller>Could you postulate WHY or HOW that can happen?  I know of
no reason and have never noticed:


A) ANY change in EGT with massive vs. Fine wire plugs.  Test data does
not confirm the claim.


B) ANY change in EGT based on what generates the spark.  Test data
does not confirm the claim.


To get a lower EGT, you MUST have the spark advanced.  That will not
result in a better situation.


The TIMING of the spark event is what will alter the EGT, not the
intensity of the spark or where it comes from or through what type of
plug.  Until someone comes up with a plausible scientific explanation
of how the source of the spark can alter the EGT and can show test
data to confirm it, I don't believe it.  The physics is still
everywhere the same.  If you are getting lower EGTs, the spark is
occurring EARLIER.  Period.  That will result in higher ICPs and
decreased durability.


Walter</fontfamily>
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