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[Fot] Spark plugs

Subject: [Fot] Spark plugs
From: sjanzen at me.com (Scott Janzen)
Date: Fri, 22 Jun 2018 14:07:23 -0400
References: <CAAGAaPXasjXrvpu9gaCzDUCFSGk_dUwnsZigUat86nJ_2ZjU4w@mail.gmail.com>
In my race GT6, I?m currently running a champion c59YC - a pretty cool plug.  
That?s 11.5:1 compression, constant high revs (4.5-7k), 110 octane.  I just had 
it on a chassis dyno and one thing I learned that was interesting - I had been 
running plug gaps in the 0.026 range (stock).  The guys at the shop asked a few 
questions, and said, you should be running about 0.035?. I bumped it up to that 
and picked up 4 HP.  
In the prior motor, different cam but mostly all else equal, I was running two 
heat ranges higher with no issues.  
Not sure that helps much for your car - look at where your current plugs are in 
the range and perhaps go up a notch or two.  The NGK article is helpful.  Might 
be that your float level is too high or the jets are too rich.
Going to the dyno with a range of jets, plugs, and a timing light has helped me 
find 5-10% more power over the years.  My local tuning/race shop will give me 
2-3 hours for about $200.  I do my own adjustments, and I go there every time 
with a new engine to do break-in pulls - much cheaper than having a new engine 
failure at the track.  

On Jun 22, 2018, at 9:11 AM, McKearn McKearn via Fot <fot at autox.team.net> 
wrote:

Hi All.
  Am looking for a plug to replace NGK BP6ES. I have had to replace these every 
year because of fouling problems and am tired of it. Engine is a 2.5 L TR6.  
10:1 compression, mild cam, Weber carbs, streetable. 
 Thanks.  P.J.
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