REFLECTOR: Spark Plug Gap

[Kent Murley]

Chuck -

Thanks for info you have provided over the years. Finally I have a  
partial answer for you.

I also have an IO540 with Jeff Rose ignition (on the bottom plugs).

At

http://www.electroair.net/

it recommends .030 - .035 inch gaps for the aviation plugs with thick  
electrodes like the REM37BY. I've had good luck with that gap.

Brand? I've used Champion and Unison (Autolite) and have not found a  
difference. That's Elbonian for "both brands are as easily dropped on  
the floor as the other by well-meaning mechanics".

Don't have any experience with auto plugs but Jeff and his protege  
have a caveat on their FAQ page about the heat range.

For my top plugs with a normal gap I've had to fork out for Iridium  
plugs to prevent fouling but that's probably because of my improper  
leaning technique on the ground, the humid air near my hangar, and my  
infrequent flying.

The extra $50 per plug for iridium plugs seems worth it now compared  
to the down time taking my cowling on and off some 5 or 6 times, but  
more importantly, having to do that in front of waiting passengers a  
couple times.

Kent Murley
Tacoma WA




On May 8, 2009, at 7:59 AM, Chuck Jensen wrote:

> Quick question - what is the recommended spark plug gap for Rose  
> Ignition with Avionics plugs?  Or auto plugs, recommended brands?
> Engine is IO540.  Thanks.
>
> Thanks,
> Chuck Jensen
> Diversified Technologies
> 2680 Westcott Blvd
> Knoxville, TN  37931
> Phn:    865-539-9000 x100
> Cell:    865-406-9001
> Fax:     865-539-9001
> cjensen at dts9000.com
>
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