8752bb4c   
   From: desertphile@invalid-address.net   
      
   On Sat, 26 Sep 2009 15:25:16 -0700 (PDT), studio   
    wrote:   
      
   > On Sep 25, 12:14 am, Desertphile    
   > wrote:   
      
   > > Testing done at 6,000 RPM for 800 foot pounds and 500 foot pounds   
   > > (a common test for horsepower) give a margin of error greater than   
   > > 7 horsepower (roughly 7.22hp). The claim above is for an engine   
   > > rated at 350 horsepower, which means one will see test results   
   > > from 343 to 357 horsepower for that engine: a difference of 4   
   > > horsepower is what one expects with no change to the engine at   
   > > all.   
      
   > Maybe you can explain how it is that when they test Iridium plugs   
   > against stock plugs, the tests always show an increase in HP and not a   
   > decrease that would obviously manifest itself 50% of the time?   
      
   I already explained that: sampling bias. The "tests" were not   
   double blinded.   
      
      
   > Of course, if it did consistently show decreases, mechanics wouldn't   
   > leave them in, nor have any reason to promote them.   
   > I don't see mechanics or advertisers promoting vortec cyclones on   
   > NASCARs.....because they don't work.   
      
      
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