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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: datacast.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR18MB2393.namprd18.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5df37b0c-8cc9-4bbc-3f98-08d84e7c12b2 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Sep 2020 13:36:46.7559 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a07f70c7-0440-4b97-b25f-a93dca3f0980 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: A/vLeQVXktIzF0dCd30noSP7cysHY/Nk84zCJaJNDBQpt2ZJsWMcSFAZ+28x0MmB6S7gqRefJMZtciYzuavw9w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR18MB3766 Hi Steve, I checked all four plugs and initially they would measure high im= pedance (Mega Ohms) but as I forced the fine tip of the probe through the c= arbon build-up they all measured slightly over 4000 Ohms, so they have not = gone open-circuit but do have carbon deposits, though nothing unusual for a= plug with about 50 hours operating time. I'm not going to toss them in th= e garbage just yet, actually will give them a thorough cleaning and maybe t= ry them again later - for now I'm sticking with the noise-free ones. Jeff -----Original Message----- From: Jeff Whaley=20 Sent: August-31-20 8:14 AM To: Rotary motors in aircraft Subject: Re: [FlyRotary] Spark Plug SAG and Electrical Interference Thanks Steve, so the plug itself is acting like a mini antenna ... I can ea= sily check the resistance from end to end and measure some other plugs lyin= g around. Yes, there was no SAG - engine was making normal power. Jeff, I have gotten RF interference from resistor type spark plugs including BR10= EIX when the internal resistor element fails and an arc occurs internally. = This can be verified by checking the resistance between the center electro= de tip and the end where the spark plug wire attaches. The resistance shou= ld be in the neighborhood of 5000 ohms with a good plug and infinite or ope= n circuit on one that has failed. My experience is that this type of failure is unrelated to SAG. Steve Boese