Join Date: Sep 1999
Location: Vancouver, Washingon
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Re: Emission laws for engine or body ?
My vehicle DOES NOT a have catalytic converter and I have headers on my vehicles, and I still pass the tail pipe emission tests fine. My vehicle had a catalytic converter when it was new, but I removed the catalytic converter when I installed the headers. All that matters for tail pipe tests is the engine have good compression (at least 135 PSI on a warm cylinder) , the carburetor is not to rich, and the ignition timing is correct (both intial timing and advance curve timing). As for the engine size, that does not matter when the tail pipe is being tested. If an oil sucking pig 4 cylinder engine has only 95 PSI on a warm cylinder compression test, and the distributor vacuum advance does not work, the best vacuum the carburetor can be adjusted for at idle is only 12 HG, and the engine has catalytic converter, the engine is going to fail the tail pipe emission test. If the engine is 400 cubic inches, has 165 PSI compression on a warm cylinder, the carburetor is adjusted for 18 Hg of vacuum at idle, initial timing is 14 degress BTDC and total timing advance is 36 degress BTDC by 3200 RPM's uses headers, does not have a catalyic converter the engine will pass a tail pipe tests. I have the emissions tests results from both Oregon and Washington emission testing to prove it. Did either Oregon or Washington look under the hood? Hell yes, but the idot inspectors did not know the difference between a V6, V8 or Inline 6 cylinder engine. Unless you live in California, I doubt the emission testers in your area know the difference between a V6, V8 or Inline 6 cylinder, let alone what year the engine is. Most emission inspectors are just punching clock, waiting for the next break, and just hand out pass/fail slips of paper and only sometimes smile.