Emission equipment difference between CA and less of USA 79 930
#1
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What emission equipment differences were there between California cars and the rest of the States in 1979? Where air pumps, advance timing on start, Cats all the same? Any other differences?
Last edited by Handy930; 02-19-2016 at 04:26 PM.
#4
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My 79 had the cast headers connecting to the heat exchangers and was told that the headers replaced the old style Cats that were attached directly to the heads. The only other thing I observe is the distributor has the advance timing on cold start. My manual shows the CA cars with the dual vacuum/pressure lines.
#5
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My 79 had the cast headers connecting to the heat exchangers and was told that the headers replaced the old style Cats that were attached directly to the heads. The only other thing I observe is the distributor has the advance timing on cold start. My manual shows the CA cars with the dual vacuum/pressure lines.
Phil
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Cat Converters work with heat, oxygen, and catalysts (usually precious metals like palladium, rhodium, platinum) to break down exhaust pollutants.
Thermal Reactor is like a super heated chamber to burn exhaust pollutants.
Archaic early Cats were restrictive to exhaust gasses and robbed motors of power.
Last edited by Porsche 930; 02-23-2016 at 11:29 PM.
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Thanks for the quick answer. I would guess it would be hard to find a 930 that still has the TR's installed with all the options available. Did the later models with Cats eliminate the air pumps and all the related devices and plumbing?
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The air pump may have been replaced but the electronic and mechanical emissions pieces that replaced them were not better in eliminating future problems. From what I understand the Cats that were introduced world wide in '86 were quite restrictive. Remember, auto manufacturers were still struggling with how to meet the EPA regs during the '80's.
I have the original Thermal Reactors for my 930 in a box (where they belong!) and have what many referred to as headers in their place. This allows all other original exhaust pieces from the heater boxes onward to remain in place. Most scrutineers overlook the lack of TR's as they realize the problems they can cause.
I have the original Thermal Reactors for my 930 in a box (where they belong!) and have what many referred to as headers in their place. This allows all other original exhaust pieces from the heater boxes onward to remain in place. Most scrutineers overlook the lack of TR's as they realize the problems they can cause.
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The first picture is the CA version (930.006.537.06), second is the 49 State version (930.006.537.05).
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Last edited by Porsche 930; 02-28-2016 at 02:16 AM.
#11
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Thanks for the information. Now the next step is to try to understand what all the components were designed to do as far as emissions are concerned. I will reference my factory manual.