<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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. <div class="">In the prior motor, different cam but mostly all else equal, I was running two heat ranges higher with no issues. </div><div class="">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.</div><div class="">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. <br class=""><div class=""><div><br class=""><div class="">On Jun 22, 2018, at 9:11 AM, McKearn McKearn via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Hi All.</div><div class=""> 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. </div><div class=""> Thanks. P.J.</div></div>
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