Tinware writing, Was this on all cars…?? Options

[Clubsport32]

Hi All

Have seen this on an unrestored car…does anybody have anymore details…? I assume the 022 refers to the 1.7L but what about the other number?

Any insight would be appreciated…thanks

Andy

[wonkipop]

@StarBear

here is the quick summary version.

EC-B
we have the emission compliant / high speed cruise economy version.
put simply. (its a blunt simplification but its basically what happens).
retard to retard = emission
advance to advance = cruise economy.

EC-A
that is the emission compliant / sweeter driveability off throttle part throttle version.
retard to retard = emission.
no advance = sweeter twisties in the mountains driving.

both are 50 state compliant.
only emission compliance was legally enforceable.
both had to have that.

fuel economy was a free choice strategy.
all they had to do was prove that either versions difference with advance did not adversely effect idle emissions. certification test would have proved that.

fuel economy version only becomes evident in high speed cruising.
by that i mean 80 mph all day on ze indashtaaate.
(some sources say 10%, some as much as 20%, you are going to notice at your wallet).
but difference disappears once you can't do more than 55 mph.
so you may as well go sweet driving option.

my thesis is.
porsche first wanted to do EC-A. the sweet driving. its the purist position.
then they thought again about that because of anwar sadat and his mates in the middle east.
so they went EC-B to begin with.
but 3 months later tricky dicky nixon stepped in anyway and made the call irrelevant when he stopped the fun and made everyone crawl.
so they went to EC-A after all, after xmas. at least you could have fun in the mountains.

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need EC-A and EC-B version stickers with 49 state certification and intact original hose set up or tune stickers to know what that really is for sure.
but suspect has no retard function activated, only advance function.
and suspect there is an EC-A version of that as well.
already know there was an EC-B version floating around.

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once you get your head around the distributor and what its doing with the throttle body,
the rest of the detail above makes sense. that was just me collected the evidence of whats out there. and trying to make sense of it.

funny enough dave darling did make sense of this 10 or more years ago.
but no-one was reading him closely enough.
back then he took everyone at their word, about the different versions,
and just laid it out in practical terms, what each version would do.
he didn't manage to address chronology.

the chronology is the bit that on first glance does not make any sense.
ie. why would B come before A?
thats the bit that was doing my head in.


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and i haven't even talked about 75 MY cars.
which all got mixed into previous discussions a long time back on this site.
and that mixing up did not help people sort out question.

but i have worked that one out as well? maybe? its just a guess.

the EC-B which we have.
went on to evolve in 75 and use the advance port on the TB to run the EGR.
one of the benefits of EGR is it not only reduces NOx emission at cruise by making combustion cooler - it gives you a slight increase in fuel economy.
so the EC-B style strategy came back in the 75 cali cars.
retard to retard for emission at idle.
EGR to advance for emission and economy at cruise.

driveability probably went to hell. i don't know. never driven one.

the 75 49 states is a little less clear.
it does not have a cat as the obvious thing.
but i think its got nothing.
its just got retard at idle and thats all.
i need to find more images to study and verify.