Keith_J
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Diesels have little to no valve overlap. There is little clearance between the piston and the head at TDC. Valves are just 10 to 15 thousandths below the planed gasket surface.
Mufflers work by providing an expansion volume, then a slight restriction or a flow path variation. Some have louvered inlets which act as reversion preventers.
The best mod for the least cost are mandrel bent head pipes from the manifolds to the mufflers. Any stock muffler is not going to add any significant back pressure compared to the crimped and necked stock head pipes.
This engine flows a theoretical 400 standard cubic feet per minute of air at maximum speed, 3600 RPM. And in actuality, it is just a bit over 300 cubic feet per minute at this high speed. Even at 950°F, dual exhaust means flow velocity is barely 200 ft per second in the stock system. Not a problem with smooth bends.
Mufflers work by providing an expansion volume, then a slight restriction or a flow path variation. Some have louvered inlets which act as reversion preventers.
The best mod for the least cost are mandrel bent head pipes from the manifolds to the mufflers. Any stock muffler is not going to add any significant back pressure compared to the crimped and necked stock head pipes.
This engine flows a theoretical 400 standard cubic feet per minute of air at maximum speed, 3600 RPM. And in actuality, it is just a bit over 300 cubic feet per minute at this high speed. Even at 950°F, dual exhaust means flow velocity is barely 200 ft per second in the stock system. Not a problem with smooth bends.