Corvettes and Air Emissions

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  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 42936

    #1

    Corvettes and Air Emissions

    First, a prelude: As some of you might know, I'm not a real big fan of vehicle emissions testing programs/requirements. My primary reason for feeling this way is because, like most other government programs, they develop their own bureaucracies and constituencies and get out of control. That's my primary problem with them since I know so well how bureaucracies operate and PROPAGATE. You see, bureaucracies are established for very well-meaning and, often, necessary purposes. However, once established they almost always get out of control. That's because bureaucracies quickly come to serve the folks who work within the bureaucracy and not the public purpose for which they were established. In a bureaucracy, expansion and propagation is LIFE. So, they propagate relentlessly even if it means disservice to the public that they were created to serve.

    Notwithstanding the above, I do believe that, in general, emissions control on automobiles is a good thing. I mean, like it or not, air quality in many parts of the country would be virtually intolerable today if it were not for automobile emissions control. However, I do not believe in retrofit sort of emissions controls (e.g. the infamous "Echlin Device" once required in California) or any sort of requirements which hold cars to standards more stringent than those which they were originally required to meet, appropriately adjusted for normal in-service wear.

    Now to the meat-of-the-matter: this afternoon I was driving back from Santa Cruz in my 92 Corvette. On the drive over the Santa Cruz mountains on Highway 17 I encountered a C5 "roadmate". I don't know the exact year model, but I expect that it was a later C5. The car had some trim modifications, non-stock wheels, an obviously altered exhaust system, and, judging from the sound and personalized license plate boasting a real (or wished for) power rating, engine modifications. So far, so good, though.

    Well, it so happened that I ended up following this fellow for awhile and noticed the VERY strong "aroma" of unburned hydrocarbons. In fact, it was like driving behind a 50's era car that was running rich. At first, I just couldn't believe that it was this car; it just didn't seem possible. So, I dropped back; the "aroma" went away. I speeded up and got within safe following distance; the strong smell returned. After awhile, it became clear to me that this Corvette was definitely the source of the fumes.

    Undoubtedly, this car has been modified in some way that emissions have gotten completely out of control. If there are even catalytic converters still on the car, they must be toast by now---no converter could deal with that kind of HC level and survive. I don't see how this car could possibly pass an emissions inspection in California. However, it's new enough that it may not have been required to get its first inspection yet (new cars in California are exempt from emissions testing for the first 3-4 years under the assumption that their emissions systems will not degrade during that period).

    I fully expect that the "genesis" of this situation is someone's insane quest to modify their engine for more power and, in the process, screw up everything. Why folks cannot be satisfied with the stock power levels of C5 (or C6) Corvettes is absolutely beyond me. With power levels in the 350 to 500 hp range, why folks would think that they need more for STREET use just absolutely astounds me. Power anywhere in that range is more than one could use for any street operations except those well into what would be considred totally irresponsible, utterly illegal operation or constituting reckless driving. I've been a performance car fanatic most of my life and a hot-rodder, too (once-upon-a-time), but I've never operated a car in an absolutely reckless manner.

    In any event, the mods made to this Corvette I described not only result in a power level that is completely unneeded for STREET operation, but it's also made the car, as new as it is, a "poster child" for "eco-****s" and a "dream-come-true" for bureaucracies looking for excuses to expand.

    Personally, I consider cars like the one I described to be an affront and insult to myself as a responsible Corvette owner and driver. They do us all harm and I, for one, do not appreciate it.
    In Appreciation of John Hinckley
  • Duke W.
    Beyond Control Poster
    • January 1, 1993
    • 15229

    #2
    Re: Corvettes and Air Emissions

    As you say, bureaucracies sooner or later all become self-serving with their own agenda. Nearly simultaneous with ending the 30-year rolling exemption that we were promised and working hard for years to make happen, the California Legislature extended the new car emission test moratorum to five/six years, AND this includes a test on change of ownership.

    So the bubba who owns this car can sell it without a test and the next owner will be stuck with the bill to fix the car when the first test comes due.

    If you want to see what kind of bone-headed things guys are doing to late model Corvettes, just glance through the late model boards of the Corvette Forum.

    And all California owners of '66 to '75 models should bend over and be ready for another one as there is no doubt in my mind that previously exempt emission controlled cars in this group will be required to be field tested in the next few years, and I also expect and attempt to require non emission controlled cars to be "retrofitted" with emission controll devices and face field testing at some point in the not to distant future.

    Unfortunately, "car guys" as a group are not very effective at fighting heavy handed legislators, and they are blaming pre-'76 cars for a disproportionate amount of vehicle emissions. We have become a convenient whipping boy and are doing nothing about it.

    Consider that there are nearly a million "exempt" plates in California - vehicles that are owned by various federal, state, and local governments and agencies, and many are fairly old and see high annual mileage accumulation. Yet NONE of these vehicles are required to receive bienniel emission tests.

    Wonder how many of them might exceed the limits of their year group and are contributing excess emissions?

    Duke

    Comment

    • Mike E.
      Extremely Frequent Poster
      • March 1, 1975
      • 5068

      #3
      Re: Corvettes and Air Emissions

      Joe--you are right on!!!!
      I am the senior pastor of a 7500+ member church, and I fight constantly against the organization becoming for the sake of the organization instead of for the sake of the people who are a part of it. Bureaucracies want to feed upon themselves.
      I also agree with your observations about modifying the new Corvettes. I understand an individual's desire to do so--that's no different than we were doing years ago as we tried both to personalize our car somehow, as well as wring some more performance out of it. However, the ballgame has changed. We are much more aware about the detrimental effects of auto exhaust pollution than we were 40 years ago (partly because our society is more aware, partly because we are 40 years older and more individually aware of implications of our actions.)
      Thanks for some challenging thinking on a Monday morning!

      Comment

      • Jack H.
        Extremely Frequent Poster
        • April 1, 1990
        • 9893

        #4
        Seems like...

        every newbie Corvette owner who drags 'baby' into the shop has a burning desire to 'soup up' the engine... Part of this obsession comes from finally having acquired a high performance vehicle and the desire to make it 'special'. What the heck, if I'm going to spend money on the power plant, why not pump it up while I'm there goes the logic.

        OK, that's human nature. But, the other logic driving these modification(s) simply escapes me! They intuitively believe somehow Zora and the boys intentionally sub-optimized the design and squandered horsepower as a result!

        Well, maybe they didn't have PC based engine dyno desktop tools, but they DID have IBM mainframe access for simulation. Gasoline was 30-50 cents per gallon and all the car had to really do was make it through a 1-year warranty.

        To presume there are 'gobs' of performance increments just waiting to be unleashed in the car's power plant AND you can tap them while maintaining a factory stock air intake/exhaust profile for judging is REALLY naive...

        Comment

        • Duke W.
          Beyond Control Poster
          • January 1, 1993
          • 15229

          #5
          Re: Seems like...

          Good engine simulations programs didn't appear until about the mid-sixties and they cost several hundred dollars per run on the old mainframes. Maybe the engine group began using them in that timeframe, maybe not, but they were used for R&D at that point in time. In fact, the simulation programs themselves were R&D.

          Most production engine engineering was based on engineering intuition and build and test.

          Current production engines are highly optimized. They have very broad torque bandwidth and excellent specific power output with low fuel consumption and emissions. The best single modification you can make, as with vintage engines, is improving head port flow coefficients, which has no material effect on emissions performance, but GM already did that on the fully CNC machined LS7 heads.

          The biggest sin committed on modern engines is installation of a "big cam". For a marginal improvement in top end power, you kill the low end torque, screw up driveability, and often times increase emissions; O2 sensors are often eliminated as are catalysts, even though modern catalysts have very low restriction.

          It's just plain stupid.

          Duke

          Comment

          • Michael H.
            Expired
            • January 29, 2008
            • 7477

            #6
            Re: Seems like...

            Young kids (and old kids) that buy new Corvettes have been screwin em up for the last fifty years. Why should we expect anything to be different today?

            When I bought my first new one in 1964, I was pretty sure that I knew WAY more than all those engineers.

            The ONLY reason that car stayed reasonably close to original was the fact that I couldn't afford headers and roller cam.

            Comment

            • John H.
              Beyond Control Poster
              • December 1, 1997
              • 16513

              #7
              Re: Seems like...

              Some of them apparently still subscribe to the philosophy once espoused by Mark Donohue - "If you can lay down two solid black stripes from the exit of one corner to the entry of the next corner, you have enough horsepower".

              Comment

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