Stevo Posted July 16, 2014 Share Posted July 16, 2014 Hi guys, Not my engine - I've had loads of mine and repaired many others, but I've never blown a plug. Went to the patch today on what was a really jinxed affair, but one engine, an SC70FS, would not start, but the flyer insisted on taking it to Perkins after I offered a rebuild. He is an experienced guy with engines of different types over many years. He did state that it does blow plugs from time to time (all his plugs are OS 'F' - now as Iv'e said Iv'e never had that. Any one else have experience of this?? Quote Link to comment Share on other sites More sharing options...
J D 8 Posted July 16, 2014 Share Posted July 16, 2014 It may be debris, the remains of an element of a previous plug floating about the motor.It only takes very small bit's to contaminate the new plug and trigger another blow. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted July 17, 2014 Share Posted July 17, 2014 As said it may be debris . Another thing to check , is he using a lipo powered glow stick ? These things are creeping in, in the mis-belief that Lipo is best . At their lowest usable voltage they are over 2volt and fully charged over 4volt ! All glow plugs as far as i'm aware are 1.5 volt .Years ago we could find 2 volt plugs to suit the popular PB batteries but that was before the advent of nicads and NiMh.. Quote Link to comment Share on other sites More sharing options...
Stevo Posted July 17, 2014 Author Share Posted July 17, 2014 Just the standard NiCd glow stick I'm afraid, although thanks for the heads up! I agree - debris from a previous plug? As I said I did offer to strip it down and find out but the flyer insisted on it going to Perkins. Should I get any feedback I'll let you know of course. I was wracking my brains - on how a plug could fail due to anything but debris - nothing else had changed, timing, fuel, glow stick eyc. Quote Link to comment Share on other sites More sharing options...
Jon H Posted July 20, 2014 Share Posted July 20, 2014 If he is running it very hot then that could be a contributing factor. If he is a touch lean on a small prop etc that could really get the plug super toasty at high rpm. But, as suggested, most likely is some debris. Probably the coil from the first dead plug Quote Link to comment Share on other sites More sharing options...
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