What is E.E.C. ?

[AMANOCC]

This carb baffle came with a intake I bought recently...parts book say "All 1970 E.E.C. with Spec H/Perf 396/454". Not up on the 1970 stuff, can anybody shed the light?
http://images.andale.com/f2/115/106/3580189/2008/1/7/IMG_3623-1.jpg http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

[L89DRMR]

Evaporative Emissions Control

Dave

[NCGuy68]

[ QUOTE ]
Evaporative Emissions Control

Dave

[/ QUOTE ]

Dave is correct, but that looks like a after-market heat shield commonly used in the 70's. Is there a OEM GM part nuber on it?

[AMANOCC]

Is the EEC on all the cars or is it a California thing? That is a GM part.
http://images.andale.com/f2/115/106/3580189/2008/1/7/IMG_3620.jpg
http://images.andale.com/f2/115/106/3580189/2008/1/7/IMG_3619.jpg

[Mr70]

In short,it was originally a California only emission mandated by the Federal Government beginning with the 1970 model year,whenever a vehicle was sold BRAND new in the state of California and certain southern most areas of Nevada too.For All passenger cars & Trucks having a gross vehicle weight of 6000 lbs. or less.
If they were assembled in the state Calif,and shipped to another state,they did not have to have E.E.C.
If they were built out of state,and shipped to be sold brand new in the state of Calif.they had to have E.E.C. added on before titled.
It was designed to minimize fuel vapors that normally escape into the atmosphere from the carbs fuel bowl & fuel tank.
Not to be confused with A.I.R.aka-SMOG,or even T.C.S.,....E.E.C.was known as RPO NA-9,which consisted of many intregal parts.The most obvious being a carburetor insulated heatshield,special modified carburetor,pressure vacuum gas cap and a Charcoal filter cannister to capture unspent fuel vapors and recirculate them back into the gas tank via a rear mounted liquid vapor seperator block.The charcoal cannister,similar in size to a Coffee can,is mounted behind the drivers side headlights on a special bracket bolted to the radiator support,with 3 purge hoses running into it.
It became standard equipment on all vehicles sold in all states in the years following 1970.
That is the correct heatshield part number for the vehicles you listed.

[COPO 70 RS/Z28]

So one of those plates be standard on a 70 camaro from Van Nuys??

Thanks

Carl

[Mr70]

Yes,as it would have the entire E.E.C. system on it,but only if that same Camaro was destined for a dealership in the state of California,and southern most Nevada.
If it was going to be shipped to a dealership and sold brand new in say Colorado,then no.

[wundercluck]

As stated in the original post, that plate is for Holley equipped Big Block cars only. The Z28's used a different plate- #3972156. It has a 45 degree angle on the R side about 2" long.

[TDW]

[ QUOTE ]
As stated in the original post, that plate is for Holley equipped Big Block cars only. The Z28's used a different plate- #3972156. It has a 45 degree angle on the R side about 2" long.

[/ QUOTE ]

Do you have a picture of the 2156? A guy on the sec gen site is looking for a picture.

[COPO 70 RS/Z28]

I would be interested in a picture also if anyone has one!!

Thanks

[AMANOCC]

Thanks Mr 70, My parts book only goes to 1970, any 71 -72 usage on this part? 71 454/425HP Corvette?

[wundercluck]

I'll try and find a pic. of mine and post it later.

[Xplantdad]

[ QUOTE ]
I'll try and find a pic. of mine and post it later.

[/ QUOTE ]


Don wanted me to post these for him...as he was having trouble doing so! http://www.yenko.net/ubbthreads/images/graemlins/beers.gif

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01716.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01718.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01720.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01721.jpg

[Xplantdad]

Last 4...

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01722.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01723.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01724.jpg

http://i19.photobucket.com/albums/b156/lotsayenkopics/MISC%20CRAP/wondercluck/tn_DSC01725.jpg

[COPO 70 RS/Z28]

Thanks Guys,

Those are great my assmb manual was giving me a fits with the plumbing for the canister http://www.yenko.net/ubbthreads/images/graemlins/smile.gif

[COPO 70 RS/Z28]

Whats the valve hooked up to the vacume advance do??

http://www.yenko.net/ubbthreads/images/graemlins/smile.gif

[CamarosRus]

"Valve" attached to the intake manifold bolt is the TCS switch (Transmission Controled Spark solenoid). This solenoid allows vacumn to advance the dist when transmission is shifted 2nd Gear.

[CamarosRus]

Pics below are of David James L.A. built R/S 70 Z-28, with NA9 option.

In 2005 this stunning restoration was the highest scoring 2nd gen LEGENDS Camaro ever entered in the ACA Camaros at Carlisle, annual show.

If there is any interest I can post additional pics in a separate thread.

http://img.photobucket.com/albums/v470/CamarosRus/DavidJames70Z28/112459506.jpg
http://img.photobucket.com/albums/v470/CamarosRus/DavidJames70Z28/Carlisle1h2005Red70Z28James.jpg
http://img.photobucket.com/albums/v470/CamarosRus/DavidJames70Z28/Carlisle1i2005Red70Z28James.jpg

[COPO 70 RS/Z28]

if its not to much trouble. Im collecting photos for my file, I plan on restoring mine some time in the future and always like to have good reference photos. Mine has been pretty hacked up under the hood (thankfully the engine is original) most of the emissions are long gone ect.

if you have time that would be great

Thanks

[TDW]

Thanks for the pictures!

[Mr70]

[ QUOTE ]
Thanks Mr70,My parts book only goes to 1970, any 71 -72 usage on this part? 71 454/425HP Corvette?

[/ QUOTE ]
No other applications have been found useing #3969835,other then what has been previously mentioned,past 1970..Can't confirm the useage of this insulator on the 71 LS-6 Corvette.
I do see 1971 & up 350cid Corvette used shield #3999198.
Can anyone confirm if the 1971 LS-6 Corvette did indeed use #3969835? http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

[YENKO DEUCE REGISTRY]

[ QUOTE ]
"Valve" attached to the intake manifold bolt is the TCS switch (Transmission Controled Spark solenoid). This solenoid allows vacumn to advance the dist when transmission is shifted 2nd Gear.

[/ QUOTE ]

I thought it was 4th gear? http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif

[Schonyenko2]

2nd gear is correct.

[John Brown]

Then what is the switch on the 3rd / 4th gear location on the Muncie side cover??

[YENKO DEUCE REGISTRY]

Exactly! I thought the pin switch was on the 3/4th gear lever on the side cover - no?

[Mr70]

Getting off topic here,but I think it depended on what transmission a vehicle had.
The intent of T.C.S. was to provide vacuum spark advance during high gear operation ONLY,because eliminating vacuum advance in all but the forward most gear significantly reduced exhaust emissions.
Cars equipped with T.C.S. and either a 3spd.M/T,4spd.M/T or Turbo-Hydramatic,only had vacuum advance applied in 3rd gear.(The 4spd. also had vacuum advance applied in 4th gear too.)
Cars equipped with T.C.S. and either a Torque-Drive or Powerglide trans.,only had vacuum advance applied in 2nd gear.
Any T.C.S. equipped Turbo-Hydra also had vacuum advance applied in reverse as well.

[Schonyenko2]

The solienoid in the area you described is the TCS plug in. I remember that when I got my L78, and my friend got his 70Z, we were just settin in the car messin around with the shifter and noticed when you shifted it through the gears that it gained rpm(we checked both cars). We dug out the manuel, and it said it was called TCS.They got disconnected as we were told they worked against opening the secondaries in the carb. http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif I was pretty sure it was 1st to 2nd, but it could be 2nd to 3rd. I know it was not 3rd to 4th. I expect it still would work on my deuce if I hooked it back up.

[YENKO DEUCE REGISTRY]

Mine is still hooked up, maybe I should disconnect it for SCRXI http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[Schonyenko2]

You have to unplug it from the unit by the carb. I'm thinkin you need to block off a vacum line too, but I'd have to look.
If yours is still hooked up, which gear is it, 2nd, or 3rd?
That selenoid is in a different location on a M22. Somewhere on the bottom. I remember we broke the one on mine when we put it in. Still need to take that thing out. http://www.yenko.net/ubbthreads/images/graemlins/mad.gif

[YENKO DEUCE REGISTRY]

I don't know which gear it kicks in, haven't really paid attention - I'll have to see now http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[Schonyenko2]

[ QUOTE ]
haven't really paid attention

[/ QUOTE ]

Ahh, George Bush syndrome. Not political, not political. http://www.yenko.net/ubbthreads/images/graemlins/grin.gif

[YENKO DEUCE REGISTRY]

Had bigger fish to fry while I was defining 'is' http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[ORIGLS6]

[ QUOTE ]
The solienoid in the area you described is the TCS plug in. I remember that when I got my L78, and my friend got his 70Z, we were just settin in the car messin around with the shifter and noticed when you shifted it through the gears that it gained rpm(we checked both cars). We dug out the manuel, and it said it was called TCS.They got disconnected as we were told they worked against opening the secondaries in the carb. http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif I was pretty sure it was 1st to 2nd, but it could be 2nd to 3rd. I know it was not 3rd to 4th. I expect it still would work on my deuce if I hooked it back up.

[/ QUOTE ]

I'm pretty sure it was 1st to 2nd. One of my buddies had a '70 454 Corvette and his did the same thing. I remember thinking it was odd that the RPMs jumped up if you put it in 2nd.

[John Brown]

Picture of Muncie side cover with T.C.S. switch.

http://www.yenko.net/attachments/310979-P0E06B2.jpg

[njsteve]

1972 455HO with M22, note position of TCS switch and harness.

http://i68.photobucket.com/albums/i30/nk15268a/PA230011.jpg

[Jacsey 70Z]

70 Z28's are 3rd and 4th gears, thats how you test them to see if the system is working, by shifting into 3-4th and watching the rpm's climb. VA is for Vacuum.

http://pic20.picturetrail.com/VOL17/1627096/5979015/121228176.jpg

[Mr70]

That's for ALL 1970 & up Transmissions equipped with T.C.S.,not just Z/28's.
Cool chart..

[YENKO DEUCE REGISTRY]

So, does it 'turn off' from 3-4th, or in 3rd & 4th? I never really noticed, was usually looking at Frankies door by then http://www.yenko.net/ubbthreads/images/graemlins/naughty.gif

[Mr70]

I think because this system is designed to provide vacuum only in a transmissions final gear,the intake mounted solenoid is "energized",(Turns On),right away when you turn the key to ignition.This vents the solenoid to the atmosphere and keeps any vacuum from reaching the distributors advance.
Once you hit the desired gear,2nd,3rd,4th or reverse,depending on what Trans.type you have,the ground field collapses,(Turns Off),via a trans. mounted switch and allows vacuum to now reach the distributors advance.
There's also a firewall mounted relay & a hot/cold temperature switch mounted in the head,that will override and collapse the field,(Turns Off),and allow immediate vacuum to the advance in all gears in the event the temperature goes above/below preset degrees.

[mockingbird812]

[ QUOTE ]
Picture of Muncie side cover with T.C.S. switch.

http://www.yenko.net/attachments/310979-P0E06B2.jpg

[/ QUOTE ]

Here it is in its natural habitat.....


http://smg.photobucket.com/albums/v697/mockingbird812/P1000597-1.jpg

[YENKO DEUCE REGISTRY]

Good explanation Rick, that was my understanding as well. I think the Deuces don't get the full advance until 4th, ie; the TCS is fully turned off when the engine is at operating temp and the trans is in 4th gear.

[Mr70]

Per Jacks chart,that would give it the characteristics of a TRUCK transmission,would it not?I'm curious if this is actually the case,and if the Deuce's 4spd.trans. applies vacuum in 4th gear only.
Please let us know your findings.

[YENKO DEUCE REGISTRY]

I guess I could simply start the car, get it warmed up, put the trans in each gear and simply wait till I hear the rpm's rise?

[Jacsey 70Z]

When I start my car cold the fast idle is on you can hear when the temp switch cuts the vacuum it will drop 2-3 hundred RPM's.
Then when warm and idling putting the shifter in third will drastically raise the RPM 4th gear also.
Very easy to test to see if these systems are working correctly, and not bad to trouble shoot. I think at high levels of judging this should be included in tech inspection, if yours works you should get credit for it.

[Mr70]

Good point.

[YENKO DEUCE REGISTRY]

Ditto that!