Spark Plugs

How to keep the Cessna 170 flying and airworthy.

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170C
Posts: 3182
Joined: Tue May 06, 2003 11:59 am

Spark Plugs

Post by 170C »

How much time are members getting from their spark plugs? I have 515 hrs on my Autolite plugs that I installed in November of 2005. They still look good and the engine runs well. As far as I can determine the resistance of each plug is within the limits I have seen published in vrs ads. The Autolite plugs replaced the Champion plugs installed at overhaul and had 498 hrs on them. I thought the Champions were OK until I had my mags overhauled and after the mags were installed the engine ran so rough I wouldn't fly it. Put the new Autolites in and it ran like a O-300 was supposed to run. I overhauled my mags again this past fall and the engine still runs good on these Autolites.
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GAHorn
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Re: Spark Plugs

Post by GAHorn »

500 hrs is good service for massive-electrode plugs. TBO can be achieved with fine-wires.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons. ;)
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