----- Original Message -----

From: John Slade

To: Rotary motors in aircraft

Sent: Tuesday, March 25, 2003 5:37 PM

Subject: [FlyRotary] Re: Spark Plugs

>Tracy, there are a few  "Standard" spark plugs which while their base is 3/4" long, their electrodes will not 

>clip/chip the apex seal.  However, that is by no means true of many/most "Standard" spark plugs. 

 

OK. Now you guys have me worried. I got a recommendation from somewhere to use B9EGV and B10EGV plugs. I forget who told me this, but I'm pretty sure it was someone flying a 13B. Are these plugs ok? Will they burn up? will they hit the apex seals?

John Slade

Ready to start her up & fly.... once I have an intake system.

 

All I can say is that I have used nothing but the stock (NGK brand) plugs recommended for the 1988 Mazda RX-7 and have been happy with their performance.  I get about 250 hours per set on auto fuel.  Less with 100LL.

 

Ian may need colder plugs because he runs at higher RPM due to the 2.85 : 1 gear drive. 

 

Tracy