Flange and Cone Developments (8/26/07)
Savage Diesel is considering the commissioning of a larger plate of custom nickel alloyed 409 stainless steel (409Ni) in 3/8" thickness suitable for the manufacture of affordable exhaust flanges. 304 is also being sought in the form of production shop drop pieces for below market prices on applications where a polished finish is desirable.
A) A SDPP "Alien Head" (VNT-15/17) exhaust flange proof.
B) A SDPP 2.25" downpipe first bend section fitted to a SDPP AH flange.
C) A SDPP tapered cone fitted to an AH flange.
D) A view looking into the SDPP tapered cone as mounted on a blown VNT-15.
E) A standard 2.5" X 2" sanitary plumbing eccentric reducer shown for comparison.
F) A VNT-15 turbo viewed from the exhaust manifold side.
Here is a close up of the SDPP tapered cone looking down the bore into the throat of the turbot's exhaust port.
Note how the pipe is properly sized and properly centered to maintain high velocity turbulent-free exhaust flow out of the turbo for the purpose of heat extraction and maximum flow enhancement.
Savage Diesel Performance Products exhaust theory...
Where the tapered cone section begins the exhaust stream will be allowed to expand. Allowing the exhaust stream to expand also causes the exhaust velocity to drop and the exhaust gas temperature to drop. Additionally, a significant heat load is transferred to the exhaust pipe itself. If the pipe dimensions are setup up correctly, an "expansion chamber" effect can be realized much like how two-stroke motorcycle exhaust systems are designed to operate. The benefit from this is a "scavenging effect" where the exhaust is "sucked out" of the turbo or at least backpressure is reduced to a negligible amount. It is SDPP's goal to exploit this simple and "free" exhaust extraction technique by deliberate designing it in from the beginning rather than later like all those who follow will do if the execution of this theory proves successful.
Here is a side view of the cone and the furry hind quarter of a highly valued SDPP associate.
Pre-production delays have been much longer than originally anticipated. However the final production run products should prove well worth the wait in terms of engineering details and cost advantage. Thank you for your patience!