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Chris Cogan · 11-28-2008, 01:41 AM

Hi Jeff,
I have heard that some super stock fellas have seen 5hp on the dyno when changing from a straight 14mm plug to these angled adaptors and 10mm plugs. I'm not sure which heads they where tested on though. These adaptors can be indexed to give you as much as 10 or 11 degrees I believe and they come in tapered and flat seat configurations.
Another thing to consider is the fact that many engine dynos are blind to changes that affect engine acceleration and transient response at gear changes. The standard acceleration rate for water brake dyno tests is 600 rpm/sec. I'm pretty sure that many SS engines exceed this, especially in low gear. : )
Anyway, I for one plan on testing these more extensively with both dyno and on track anaylsis. I'm also curious to see what these adaptors could do for heads that have angled plugs already. Who's to say that the factory angle is best for every combination. I look at these as an additional tuning tool to find that little extra that we all seek. Take care jeff.

11-28-2008, 01:41 AM	#5
Chris Cogan Junior Member Join Date: Apr 2007 Location: Defiance, OH Posts: 47 Likes: 0 Liked 0 Times in 0 Posts	Re: Improved Combustion Hi Jeff, I have heard that some super stock fellas have seen 5hp on the dyno when changing from a straight 14mm plug to these angled adaptors and 10mm plugs. I'm not sure which heads they where tested on though. These adaptors can be indexed to give you as much as 10 or 11 degrees I believe and they come in tapered and flat seat configurations. Another thing to consider is the fact that many engine dynos are blind to changes that affect engine acceleration and transient response at gear changes. The standard acceleration rate for water brake dyno tests is 600 rpm/sec. I'm pretty sure that many SS engines exceed this, especially in low gear. : ) Anyway, I for one plan on testing these more extensively with both dyno and on track anaylsis. I'm also curious to see what these adaptors could do for heads that have angled plugs already. Who's to say that the factory angle is best for every combination. I look at these as an additional tuning tool to find that little extra that we all seek. Take care jeff. __________________ Chris Cogan Last edited by Chris Cogan; 11-28-2008 at 01:51 AM.