Riker offers aftermarket “diffuser” stacks

RIKER Emiss Stack Photo 1Riker Products’ “diffuser” stacks began being used in late 2007 on PACCAR trucks that were built with new emissions motors.

Other truck manufacturers soon began introducing their own versions of these stacks – stacks that were vented to allow cool air to enter into the exhaust stream and mix with the hot exhaust, thus diluting the exit temperatures. When these first generation of emissions trucks were built, the exhaust systems had a regeneration mode that misted raw diesel fuel into the DPF units to superheat them, so they would burn-off any collected soot from the diesel exhaust.

At the time, it was typical for exhaust temps to reach 1,200-1,300 degrees during regeneration, thus, the need for a type of stack to reduce these extreme temperatures.

The Riker “Emissions” stacks incorporate a unique design that creates outside air to enter into the hot exhaust stream near the entry of the stack. There are four openings that allow cool air to enter via a scavenging effect with the engine running and the resultant temperature drop is approximately 30 percent at the exit of the stack.

The Riker stacks are 6-in. in diameter, with 5-in. OD inlets.  The stacks do not produce any extra backpressure and are available in 24, 36, 48 and 60-in. lengths and are chrome-plated.

“The main benefit with the Riker emissions stacks is the cost savings,” says Riker’s aftermarket sales manager Eric Sauls..

“These types of stacks through the OE’s are extremely cost prohibitive. All Riker chrome stacks are double nickel, Trivalent type and meet or exceed OE specs. They are also available in 409 Stainless upon request and also available in different lengths upon request as well.”

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