Topic: 67 390 San Jose - Smog/emissions Questions

[V8_bloke_28]

Hi, I have a 67 mustang 390 built in San Jose with DSO 71. On the marti report it states "emissions"
What does that exactly mean and is that the same as smog?

[67gta289]

I'll get the ball rolling.  I believe that all engines for 1967 delivered to US DSO's received the basic positive crankcase ventilation system, either open (air entry via screened oil filler cap) or closed (air entry filtered by the air filter).  California DSO's 71 (LA) and 72 (SF) had more stringent requirements.  These were met with an exhaust emission control system called the "thermactor" system.  The thermactor introduces air, via an air pump, hoses, checkvalves, and other stuff, into the exhaust chambers in the heads.  The intent was to reduce hydrocarbon and carbon monoxide levels in the exhaust.  There is some question as to whether and/or when thermactor was provided for DSO 71 and 72 for the 289 Hipo for the 67 model year.

The term "smog system" is what I would consider slang for any system intended to meet emission requirements, since it is "smog" that the requirements were intended to control.

I do think that the "emissions" item (requirement for your DSO, not an option) does equate to the thermactor system.

In late 1967 Ford introduced the term "IMCO" for "IMproved COmbustion", a series of small changes, that was an attempt at reducing emissions at a lower cost than thermactor.  In 1968, I believe that all engines had IMCO implemented, but California DSO's still had a thermactor solution.

[J_Speegle]

+1 (Except for the 68 information as Bob mentioned. Plus to add to that all of the emissions standards were the same across the country so 4 speeds and Holley equipped cars got Thermactor. The rest just IMCO)


Given your DSO your car would have originally had the full Thermactor system Only part of the system that we've been "discussing" through the years is what air cleaner would have been approved/legal for use in Calif that year. Everyone I've owned (390 67's delivered to 71 or 72 DSO) had the T-bird air cleaner with chrome lid

Its a fairly deep subject (67 Thermactor system on 390s) as the system/parts changed over the year so you have to be pretty specific about dates and such. Think I recall at least 6 changes between the first part of production and the end. if not more. Have a fair amount of books (Ford and those used by the BAR and before)  so should be able to help if you choose to return all the original parts

As a side note - there are other regions that also had different "emission requirements such as New York but that is all a different subject and not one I've research allot - likely because of my location

[Bob Gaines]

I'll get the ball rolling.  I believe that all engines for 1967 delivered to US DSO's received the basic positive crankcase ventilation system, either open (air entry via screened oil filler cap) or closed (air entry filtered by the air filter).  California DSO's 71 (LA) and 72 (SF) had more stringent requirements.  These were met with an exhaust emission control system called the "thermactor" system.  The thermactor introduces air, via an air pump, hoses, checkvalves, and other stuff, into the exhaust chambers in the heads.  The intent was to reduce hydrocarbon and carbon monoxide levels in the exhaust.  There is some question as to whether and/or when thermactor was provided for DSO 71 and 72 for the 289 Hipo for the 67 model year.

The term "smog system" is what I would consider slang for any system intended to meet emission requirements, since it is "smog" that the requirements were intended to control.

I do think that the "emissions" item (requirement for your DSO, not an option) does equate to the thermactor system.

In late 1967 Ford introduced the term "IMCO" for "IMproved COmbustion", a series of small changes, that was an attempt at reducing emissions at a lower cost than thermactor. In 1968, I believe that all engines had IMCO implemented, but California DSO's still had a thermactor solution.

Not just CA. J code 4 speed cars had the thermactor solution too  wether CA or not .

[mikelj5S230]

I found this thread in my search and just wanted to be sure, if you have a New Jersey (T) S code GT Mustang that was ordered in the 41, Chicago DSO, it would NOT have the thermactor system, correct?

[67gtasanjose]

I found this thread in my search and just wanted to be sure, if you have a New Jersey (T) S code GT Mustang that was ordered in the 41, Chicago DSO, it would NOT have the thermactor system, correct?

I believe there was another thread several weeks ago on a 67 S-code from New Jersey but I'm not sure if the end result indicated this as truth or not, so maybe somebody else can clarify. That thread was related originally about the carburetor. My understanding as a result of that particular thread, is that Thermactor Systems (possibly) COULD be ordered in any DSO, but was only required option in DSO 71 & 72.  A Marti Report could clear that up, if yours could have been ordered with Thermactor or not. My recolection is that the other poster hadn't yet recieved a Marti Report either or came back with other information suggesting this being any remote possibility.

Here is that thread:
http://www.concoursmustang.com/forum/index.php?topic=8418.0

Richard

[J_Speegle]

I found this thread in my search and just wanted to be sure, if you have a New Jersey (T) S code GT Mustang that was ordered in the 41, Chicago DSO, it would NOT have the thermactor system, correct?

Normally not but there are some unusual combinations that took place when an owner ordered from one part of the country with a car being delivered (in this possible example to a state that required a different emission system)

One way to be certain is to look at the build sheet or a Marti report.

But normally ordered and delivered in DSO 41 would not

[mikelj5S230]

OK, thanks guys.  The Marti and build sheet have nothing about "emissions" or thermactor being added.