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Re: [GMCnet] California smogged coaches [message #271178 is a reply to message #271137] Wed, 04 February 2015 08:44 Go to previous messageGo to previous message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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James Hupy wrote on Tue, 03 February 2015 20:49
Gee, I was only repeating what I was taught at GM Training School at Tigard Oregon when I attended. They could have been wrong. Sure hate to think after all these years that GM could have gotten it so wrong.

Jim,

That is probably what you were taught.
And Yes, They taught you wrong. And, many knew it at the time and the story behind is kind of interesting.
At the time Ed Muskie (Remember Him) had some power and was looking at running for president he had decided that the democrats would be "the environmental party" (a reverse from their prior stand) and he decided to make a name for himself by using the newly formed EPA as a weapon. He got rules issued to make automobiles cleaner. Unfortunately for us, they picked a sample of post EPA Rules 1 cars that were less than a year old and already 90% cleaner than pre-rule 1 cars. And set the target at 90% of that.

These cars hit the streets in about 1970 and were terrible. The people were used to cars that actually ran. Pre-Rule 1 cars were tuned for performance. (In the industry they were often called gasoline cooled engines.) After rule 1, they had to effective control fuel and make engines cool better and not dump raw gas on the street. The manufactures made the 90% mark plus.

Then Rule 2 hit.....
HC had pretty well been managed, but NOx was still an issue because combustion processes were still too hot. So, EGR came along along with a whole new set of problems. Most notable was that these new cars ran like 5h1t. An Immediate Response was that effective mechanics were out there disabling the emission controls in a effort to have satisfied clients. The people in power were livid and made it know that they would seek stringent enforcement. So, and early response from the manufactures was to first tell the story that the emission controls were good for the engine's life (wrong) and then an effort push by the EPA called "Run Worse" that would hopefully make a vehicle that was out of tune or with hardware disabled to run less well than it would otherwise. This was a humorous failure all around. It lead directly to the terrible performance and fuel economy of the 70's catalytic cars.

I would love to go on with this, but I do have things to do today, like clear the new snow.

Matt

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