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Oil Field Engines & Related Equipment

McEwen Bros half breed ignition -- need help

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Old 10-10-2018, 10:29:17 AM
farmacresinohio farmacresinohio is offline
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Default McEwen Bros half breed ignition -- need help

Need some advice. I am working on this McEwen Bros. half breed ---- running on a mag and seems to prematurely "double fire" (after 30 seconds of running near perfectly) and then stalls to a stop.

So I replumbed it completely to now include accumulator tank and Garretson KN demand regulator. Yes, the accumulator is between the gas grill regulator and demand regulator. Yes, I am using a 100 lb propane tank. Diamond valve is located after demand regulator (at intake). Question -- what is the cause of the additional ignition? I think it occurs BTDC, but unsure. Could a faulty intake valve result in this? Wrong spark plug? too rich? Currently, the mag ignites ATDC. Terribly confused. I notice the RPM's increase gradually before this "double fire" event happens. I can send pic and/or video if needed. Tony Skowronek, Southern Ohio.
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