Posted by Janicholson on February 18, 2009 at 06:35:42 from (199.17.6.128):
In Reply to: Re: MD Questions posted by D Slater on February 17, 2009 at 19:33:51:
I have no flame, but it is fun to discuss. The mixed air and fuel on the Gasoline operation mode run through the same intake ports in the head that the air enters in the diesel mode. The Third valve is always open, in gasoline mode, without "seat" time to cool it. The gasoline compression relief chamber and spark plug are cooled to engine operating temp for the casting during operation such that the hotest element in the chamber would be the back of the compression relief valve. A gasoline operation has flame fronts extending all the way to the edges of the entire combustion area including the compression relief area. This flame front burns until it is quenched near the boundary of the cold (relative) combustion chamber and prechamber and compression relief chamber. The diesel flame is concentrated in the area of the prechamber and the hole leading to the top of the piston/valves. My true impression includes the idea that a post diesel run of a few seconds hurts nothing, and might (might) clean the spark plugs a bit from the start cycle carbon that could be there? I was told by the man I bought my 48 MD (with a shutoff button, but distributor coil ign 12 volt.) that he ran it at max output for its entire life on a irrigation pump, and that it had litteraly no wear on the drive train. (in 1997 and 98, it still had 1/2 worn original tires on it. It was shut off after as much as 75 hours of full output operation by running it at idle diesel for 5 minutes, then just closing the diesel speed control. It never had the head off of it as far as I know. Good discussion, JimN
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