<VV> spark plug questions technical revisited again

[Frank DuVal]

Yes, as you should have reasoned  since changing .001" should have a 
similar effect on either side of .052".

Using the HP 11C with built in pi key and 5 fixed decimal places:

.053" hole has area of .00221 square inches.
.052"   "                      .00212  "         "
.051"   "                      .00204  "         "
.050"   "                      .00196  "         "

Frank DuVal

Michael Kovacs wrote:

> 
>   When I removed the R44F plugs I noticed #2 & #5 were quite clean with just a trace of deposit. However, the other 4 were black and dusted with carbon. Is this the result of a 140 running mostly on just the primary carbs and the far cyls don't get the same air fuel mixture? 
>   
>   It runs very strong at all engine speeds, with no hint of a problem. The exhaust pipes are black carbon dust.
>   
>   The primaries are .053 and the secondaries are .050. Engine is .060 over. 
>  A quick calculation shows the area of a jet:
>  .053 = .005200  
>  .052 = .002122
>  .051 = .002041 
>  .050 = .001962 recommended  primary
>  .046 = .001661 recommended secondary
>   
>   The .053 has over twice the area of a .052 
>   
>   Try it your self  3.14x(radius squared). 
>   
>   Next trick will be to go to an .052 in the primaries.
>   
>   The .050 is virtually the same as a .051
>   
>   Comments, am I wrong??
>   
>
>
>MIKE KOVACS
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