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12 & 24 valve exhaust
manifold
Dodge 5.9 12 & 24 Valve from 1994-2002
The ATS three piece pulse manifold for the Dodge Cummins
application with its pulse exhaust flow design, increases exhaust gas efficiency
helping to spool up the turbocharger sooner with less exhaust back-pressure.
This pulse manifold design eliminates the problems that persist with the stock
manifold in both 12 and 24 valve engines, that is namely the shrinking and
breaking of the manifolds. The stock manifold in both 12 and 24 valve engines
can shrink as much as 3/8 of an inch. This causes exhaust gasket problems,
manifold-cracking problems, and exhaust flow problems created by exhaust port
misalignment. In 12 valve engines, one sees sheared off manifold bolts, and this
extreme shrinkage can sometimes even break the ears off the head where the stock
manifold is attached.
Expansion and contraction of the ATS pulse manifold is taken up in the two
expansion joints. These expansion joints are unique in design. Advanced Turbo
Systems holds a U.S. patent in the expansion joints design and function. The
center portion of the manifold is machined with a straight bore on each end of
the center section to accept the end castings. One set of bolt holes have merely
a clearance fit where the manifold attaches to the cylinder head, the other set
of bolt holes have more clearance for expansion.
The end castings are where the function of this design becomes unique.
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The
end castings that install into the straight bore of the center casting are a
ball circumference seal arrangement. This allows the expansion joint to have
interference fit and still assemble the manifold easily; while creating an
excellent seal arrangement which allows for expansion and contraction of the
manifold while maintaining a positive seal. The end castings of this
manifold have one hole that is bolt clearance only. This insures near
perfect exhaust port alignment without exhaust manifold movement on the
head. This eliminates gasket and bolt loosening problems.
The ATS three-piece pulse manifold is cast of a much higher-grade material
than the stock manifold. Instead of being just cast iron like the stock
manifold, the ATS manifold is a ductile casting, which will handle far more
heat without being brittle. This pulse manifold is a high
molly-silicon-ductile casting that is machined on state of the art
palletized CNC machining centers. This three-piece pulse manifold comes with
new socket head cap screws and washer.
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