Re: M engine - How would you build it?

Posted by Janicholson on August 08, 2007 at 11:18:01 from (66.173.50.144):

In Reply to: Re: M engine - How would you build it? posted by mark on August 08, 2007 at 09:37:10:

One issue not well discussed yet is duration of peak mean effective pressure. The slow farm tractor is going to have maybe three times as much actual time go by with the pressures as high as they will go. Not only does this lead to detonation, but substantial heat transfer to the exposed combustion surfacs near 3 to 8 degrees after TDC. A auto engine cranking 3 to 4K RPM will have far fewer issues there. I do believe the fuels are way better off with no lead not only for humans, but for engine life and spark plug longivity. Auto engines use vacuum retard/advance controls to make modest fuels work (or today electronic fuel and spark control. The highest efficiency is obtained at the exact point of the beginning of detonation, Just a tiny bit is perfect. Sensors on new engines do this per cylinder in some cases to optimize spark and mix. On an M ---- sorry. JimN

Replies:

• Re: M engine - How would you build it? CenTexFarmall 18:40:44 08/08/07 (0)

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