Non Corvette assembly plant question

[Joe L.]

Re: Non Corvette assembly plant question

Did you mean to say TCS (70,72), CEC (71)?

Kevin------

No, CCS (Controlled Combustion System) is what I was referring to. This is a system which involves special carburetor calibration and, in some cases, special distributor advance characteristics. CCS is an alternative to AIR exhaust emission control. TCS and CEC may be considered part of a CCS system but those two systems are also part of AIR equipped cars emission control system

[Kevin G.]

Re: Non Corvette assembly plant question

Kevin------

No, CCS (Controlled Combustion System) is what I was referring to. This is a system which involves special carburetor calibration and, in some cases, special distributor advance characteristics. CCS is an alternative to AIR exhaust emission control. TCS and CEC may be considered part of a CCS system but those two systems are also part of AIR equipped cars emission control system

Mr. Lucia,

I'm still just a little confused, please forgive me. As a part of a properly functioning emissions system, don't both the TCS and CEC systems control combustion, alter the advance and effect carburetor settings? So, does this make the CCS a part of each of these? Or simply, is the CCS applicable before or on only non AIR engines ? These early emission control systems seem to intrigue me. TIA

[Joe L.]

Re: Non Corvette assembly plant question

Mr. Lucia,

I'm still just a little confused, please forgive me. As a part of a properly functioning emissions system, don't both the TCS and CEC systems control combustion, alter the advance and effect carburetor settings? So, does this make the CCS a part of each of these? Or simply, is the CCS applicable before or on only non AIR engines ? These early emission control systems seem to intrigue me. TIA

Kevin------

There were many emission control systems used on cars at the beginning of the emissions control era and many different systems still in use today. For any given application, the COMBINATION of the systems was supposed to ensure compliance with then-extant emissions control requirements. So, all of the systems worked together to achieve this. The Controlled Combustion System (CCS) was one such system. However, it was never used in conjunction with Air Injection Reactor (AIR). The CCS functioned by altering the combustion characteristics of the engine and, thus, reducing exhaust emissions. The AIR functioned by combusting unburned hydrocarbons subsequent to the combustion chambers of the engine. Of course, other systems worked in concert with both of these systems to reduce exhaust emissions. Transmission Controlled Spark (TCS) and Combined Emissions Control (CEC) were two of the other systems. However, these worked in conjunction with EITHER CCS or AIR to reduce overall emissions. As far as I know, they were never considered part of either CCS or AIR.

There were other emissions control systems also used. Positive Crankcase Ventilation (PCV) was the earliest. This system returned combustion "blow-by" to the intake system to prevent its escape to the atmosphere. In 1970, Evaporation Emission Control (EEC) systems were added to California cars to reduce fuel evaporative emissions and in 1971 it spread to all cars. In 1973 Exhaust Gas Recirculation (EGR) was added to most cars to reduce oxides of nitrogen emissions. In 1975 catalytic converters were added and this was a great stride as it took some of the pressure off the "upstream", often performance-robbing systems to control emissions of CO, HC, and NOx.

[Kevin G.]

Re: Non Corvette assembly plant question

Kevin------

There were many emission control systems used on cars at the beginning of the emissions control era and many different systems still in use today. For any given application, the COMBINATION of the systems was supposed to ensure compliance with then-extant emissions control requirements. So, all of the systems worked together to achieve this. The Controlled Combustion System (CCS) was one such system. However, it was never used in conjunction with Air Injection Reactor (AIR). The CCS functioned by altering the combustion characteristics of the engine and, thus, reducing exhaust emissions. The AIR functioned by combusting unburned hydrocarbons subsequent to the combustion chambers of the engine. Of course, other systems worked in concert with both of these systems to reduce exhaust emissions. Transmission Controlled Spark (TCS) and Combined Emissions Control (CEC) were two of the other systems. However, these worked in conjunction with EITHER CCS or AIR to reduce overall emissions. As far as I know, they were never considered part of either CCS or AIR.

There were other emissions control systems also used. Positive Crankcase Ventilation (PCV) was the earliest. This system returned combustion "blow-by" to the intake system to prevent its escape to the atmosphere. In 1970, Evaporation Emission Control (EEC) systems were added to California cars to reduce fuel evaporative emissions and in 1971 it spread to all cars. In 1973 Exhaust Gas Recirculation (EGR) was added to most cars to reduce oxides of nitrogen emissions. In 1975 catalytic converters were added and this was a great stride as it took some of the pressure off the "upstream", often performance-robbing systems to control emissions of CO, HC, and NOx.

Mr. Lucia-----

I thank you, for taking the time to post this well written explanation of these systems. I do believe I've got it! The days where the SMOG could be sliced with a sword, hovering over LA California, still linger in my memories!

Regards,

Kevin

[Tom B.]

Re: Non Corvette assembly plant question

My 67 Nova SS 327 Delivered new to Community Chevy in Burbank. All smog intact pump ,lines and mixture control valve. Try finding replacement tubes for some of these odd combinations.