<VV> Plugs: AC-R44F = AC-44F?

[Frank DuVal]

Your linage of part numbers is backwards.

44FF is the original plug for the Corvair. When these were discontinued, 
the 44F was available.
R just means resistor version. i.e. R44F is resistor version of 44F. One 
can use the R versions to replace the non R versions just fine. In fact, 
most "people" prefer the resistor versions to standard plugs for 
everyday driving. Helps cut out AM radio static. But who listens to AM????

The FF plug is threaded all the way to the end. The F plug stops a 
thread short of the end. The total length that sticks into the head is 
the same, so performance is OK.

BTW, low horsepower engines used 46FF. Some turbo owners used 43FF or 
42FF plugs way back.

I have used Bosch for years.

Frank DuVal

Blaine Sanders wrote:

>I was at the parts store today and out of curiosity asked the parts guy what he listed as a direct replacement for the old AC 44F spark plug.  He looked in his catalog and told me AC-R44F.  I thought the closest thing was the 44FF.  What is the difference between the R44F and the 44FF?
>
>Years ago I ran some bosch plugs in my 110, and they seemed to work really well.  I'm thinking about giving the NGK's a try this time around.  I used to know the correct part number for the NGK's, but I lost that info.  Anyone have the number handy?
>
>Thanks,
>
>Blaine
>
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