Forum Discussion
Matt_Colie
Jan 21, 2022Explorer II
LandYacht35diesel wrote:
Yo Matt …. Was the operation of that TUNED INTO the total warmed up engine and speed of the vehicle?
Land,
The early systems included a mini-muffler (called a sanitizer) that had a thermocouple in it, and a road speed switch. This was kind of expensive and after considerable testing, they changed to a vacuum switch (there were very few diesels at that time) and a time delay. Both systems insured that the exhaust systems were hot before pumping started.
The systems without a "sanitizer", had a stainless probe and a screen (about 100 iirc) to insure that no large particles were released into the exhaust stream.
Both of these systems came to an issue with the primitive state based emission laws of the day. Many simply demanded that no vehicle exhaust system could be modified from what was manufactured. This destroyed the aftermarket in many states. As it could not even be a dealer installed option, that lead to reduced sales.
The pumping rate could be controlled with the selection of the tubing size in the peristaltic pump element, but it was found that the standard selection was good enough for all the test coaches we had available to us. This was all part of the "odor limit" controls. There was never any doubt when a following vehicle would know it was working.
Matt
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