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914/4: 70 71 72 73 74 75 76 914/6: 70 71 72

> 1974 914 1.8, the mystery of the EC-A and EC-B
wonkipop
post Dec 25 2021, 05:12 PM
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i'll be dropping the information we have gathered over Dec 2021 in with a set of posts.

the material was prompted by mr b ( @JeffBowlsby ) who observed that for the 74 MY there was an EC-A and an EC-B engine. mr b's thought was that the EC-A was a 49 states car and and EC-B was a californian car for emissions.

mr b's view was rational and reasoned. 73 EA engines are 49 states. 73 EB engines are california. 75 engines are documented in factory literature as EC-a (49 states) and EC-b (california). the logic should follow?

BUT

as per the mystery of the 914, the truth about 74 1.8s turns out stranger than fiction (or common sense?).

the material is not necessary to running a 1.8 or having fun with a 14. (IMG:style_emoticons/default/smile.gif)

its for historical purposes and as information to 74 1.8 owners to assist with restoration if they want it.
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wonkipop
post Dec 26 2021, 12:38 AM
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VAPOR EMISSIONS CONTROL SYSTEM.

(aka the charcoal canister or how it is plumbed).

this has been debated previously.

refer here.

http://www.914world.com/bbs2/index.php?showtopic=347951

in summary owners of original condition 74 1.8s with the engine bay canister know it is plumbed in an arrangement contrary to some hose diagrams that have been published and in a manner contrary to 73 and earlier year 914s.

---------------

the events of 1973 concerning the EPA case cast some light on the VECS (vapor emission control system).

the design of the system incorporated in the 1970-73 914s is in principle the same as the system used by porsche for 911 models from 1969-73.

Attached Image

in 1973 for 1974-77 years porsche revised the system for its 911 models.

Attached Image


note - the element that is altered is that a different end of the can is connected to the fan feed line.

--------------------


the schematic layout of the 1974 VECS is shown in the emissions warranty for the 1974 914 model. this emissions warranty came with a 1974 1.8 model.

Attached Image
Attached Image

the plumbing of the 914 1.8 hoses is consistent with the update porsche carried out for its 911 models for 74 MY.


-----------------------


the changes to the VECS that porsche introduced for the 74 MY across its range brought the system into line with VW designs for the VECS that had been in place since 1969.

Attached Image
Attached Image
Attached Image
Attached Image


-------------------------


the original factory installed plumbing arrangement of the VECS in a 74 1.8 is characterised by an S-curved hose from the fan feed port on the fan housing to the lhs of the engine bay mounted charcoal canister. the rhs of the can is connected to the hose from the air cleaner and the fuel vapor line.

Attached Image
Attached Image

note - this is only known to apply to 1.8 cars with the engine bay canister location update.


----------------------------


the canister location update occurred between 20 Nov 73 and 28 Nov 73.
(refer schedule 2 at beginning of thread).
EDIT JUNE 2022. further example has come to light indicating changeover is either side of weekend 17/18 Nov 73.
refer page 2 of this thread for information/data.


cars before the update had the VECS cannister in the front trunk.
Attached Image

cars after the update had the canister in the engine bay.

Attached Image


note - it has not been established how the front trunk mounted canisters were plumbed.
the system may have conformed to the earlier porsche design for 69-73 MY cars.

EDIT MAY 2022 - further data has been obtained which clarifies the plumbing layouts for the front trunk mounted canisters and the engine bay mounted canisters.
This data has been entered on page 3 of this thread.
the frunk mounted canisters used the Porsche design earlier version of hose hookup dating from 1970 MY on. the engine bay canisters used the VW design for the hose hook up from approx Nov 20 1973 on.



----------------------------


1974 914 1.8 HOSE LAYOUTS.

the engine hose layouts by Pete Klager and published on the Pelican Parts website are the most accurate diagrams.

the diagrams are for the 1975 1.8 EC-b (california version).

Attached Image

note -

for the 1974 EC-B engine the EGR is deleted (along with T connection to dist-T/B vacuum advance line). the position of the charcoal can is on the rear bulkhead of the engine bay instead of next to the battery but with the plumbing arrangement shown.

for the 1974 EC-A engine as above for EC-B, but additionally the vacuum line connecting the dist-T/B advance line is disconnected at the T/B. the T/B either does not have a vac advance port or the port is capped with a seal. the hose from the advance port on the distributor is tucked under the distributor and left open.

this has also been previously explained by Dave Darling more than 10 years ago.
DD noted there were two versions of the hose layout for L-Jets.
at that time DD had not made a connection between the layouts and the emission stickers indicating either EC-A or EC-B or that the engines may have been sales market determined variations.

EDIT JUNE 2022
final hose layouts for 1974 EC-A/EC-B are posted on page 3 of this thread.



-------------

EC-A v EC-B

in principle it was (is) very simple to turn an EC-A engine into an EC-B engine.

simply connect the vacuum advance hose from the vac advance can on the distributor to the vac advance port on the throttle body (assuming the throttle body has a port).

and in reverse to alter an EC-B into an EC-A.

this may have been porsche and vw intention with the ambiguous emission sticker that stated both versions were USEPA and California conforming.

the adjustment may have been an easy matter for dealers to carry out (if the EC-A was fitted with a throttle body that had only a cap seal on the port).

it may have been a strategy to provide flexibility in terms of stocks of cars available for sale across the USA including California. given the delayed introduction of the 1.8 which did not it appears commence production until Nov 1973.

it is unclear how this would have worked in terms of annual emissions tests on vehicles.
CARB documentation implies that testers would technically have only had approval for EC-A stickered cars.

?
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Posts in this topic
wonkipop   1974 914 1.8   Dec 25 2021, 05:12 PM
wonkipop   SURVEY OF MEMBERS WITH 74 1.8s. INFORMATION FROM R...   Dec 25 2021, 05:14 PM
wonkipop   DATE - UP DATE OF VAPOR EMISSION CONTROL SYSTEM. ...   Dec 25 2021, 05:19 PM
wonkipop   EC-A and EC-B engines are most obviously identifie...   Dec 25 2021, 05:41 PM
wonkipop   emission stickers indicate that both engine versio...   Dec 25 2021, 05:47 PM
wonkipop   more to come   Dec 25 2021, 06:29 PM
RRietman   more to come If it makes any difference, I shoul...   Dec 25 2021, 07:41 PM
wonkipop   thanks for that info randy i revised the schedule ...   Dec 25 2021, 08:24 PM
wonkipop   EC-A / EC-B THROTTLE BODY AND DISTRIBUTOR WITH VA...   Dec 25 2021, 09:06 PM
wonkipop   EXCEPTIONAL DATA 1 MYSTERY CAR mr. b has documen...   Dec 25 2021, 09:06 PM
wonkipop   EXCEPTIONAL DATA 2 paint stamp engine number EA 3...   Dec 25 2021, 09:43 PM
wonkipop   EXCEPTIONAL DATA 3 EC-A engined car (california/C...   Dec 25 2021, 10:12 PM
wonkipop   A HYPOTHETICAL. PAINT STAMP ENGINE NUMBER. this ...   Dec 25 2021, 10:32 PM
wonkipop   POST SCRIPT A TROUBLED BIRTH FOR L - JET / THE FI...   Dec 25 2021, 11:21 PM
wonkipop   VAPOR EMISSIONS CONTROL SYSTEM. (aka the charcoal...   Dec 26 2021, 12:38 AM
wonkipop   revising comments welcome. further documented 1.8...   Dec 26 2021, 04:02 PM
StarBear   Destined to be a classic (though imho it already i...   Dec 26 2021, 08:07 PM
wonkipop   post script @StarBear of course the 1.8 is a...   Dec 27 2021, 04:54 PM
Van B   Anyone else notice that hellhole rust on the museu...   Dec 29 2021, 02:00 PM
wonkipop   Anyone else notice that hellhole rust on the muse...   Dec 29 2021, 03:57 PM
Van B   Was there any car in the US that got the AN or AT ...   Dec 29 2021, 07:26 PM
wonkipop   Was there any car in the US that got the AN or AT...   Dec 29 2021, 07:46 PM
Van B   Well, really the point is to find high compression...   Dec 29 2021, 10:54 PM
wonkipop   Well, really the point is to find high compressio...   Dec 30 2021, 05:15 PM
JeffBowlsby   AN engine in a factory 1974 914 GT (European-marke...   Dec 31 2021, 10:25 AM
wonkipop   ^ wow. original motor?   Dec 31 2021, 07:04 PM
wonkipop   @[url=http://www.914world.com/bbs2/index.php?showu...   Jan 25 2022, 06:12 PM
StarBear   Yep, I'm convinced. Probably (?) not a single ...   Jan 25 2022, 06:39 PM
wonkipop   Yep, I'm convinced. Probably (?) not a single...   Jan 25 2022, 07:24 PM
JeffBowlsby   Nice detective work. I know of nothing in conflic...   Jan 25 2022, 07:15 PM
wonkipop   @StarBear production looks to go like this for 74...   Jan 25 2022, 07:51 PM
L-Jet914   What's interesting is when I replaced my ignit...   Feb 1 2022, 11:17 PM
wonkipop   What's interesting is when I replaced my igni...   Feb 2 2022, 04:12 PM
Van B   @[url=http://www.914world.com/bbs2/index.php?showu...   Feb 20 2022, 11:21 PM
wonkipop   @[url=http://www.914world.com/bbs2/index.php?show...   Feb 21 2022, 03:39 AM
Van B   I wonder what it sold for? And do you know if the ...   Feb 21 2022, 10:59 AM
wonkipop   I would say we’re it not for a low budget mecha...   Feb 21 2022, 03:41 PM
wonkipop   also that yellow car is one more confirmation that...   Feb 22 2022, 10:25 AM
Racer   What a rather well documented thread. Question.. ...   Feb 22 2022, 02:28 PM
wonkipop   What a rather well documented thread. Question.....   Feb 22 2022, 04:21 PM
Van B   @wonkipop I remember you saying that about the sw...   Feb 25 2022, 11:56 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Feb 25 2022, 08:40 PM
Van B   Its got some PoS KYB on the rear and who knows wha...   Feb 27 2022, 11:14 PM
wonkipop   Its got some PoS KYB on the rear and who knows wh...   Feb 28 2022, 02:15 AM
StarBear   Mine has the appearance group, sway bars and the b...   Mar 24 2022, 06:53 AM
wonkipop   for @Van B came across this image in obscure part...   Mar 27 2022, 01:37 AM
wonkipop   VAPOR EMISSION CONTROL SYSTEM update information....   May 22 2022, 01:03 PM
Van B   @wonkipop My car was not a frunk can. It is a re...   May 25 2022, 09:06 AM
wonkipop   @[url=http://www.914world.com/bbs2/index.php?show...   May 25 2022, 05:02 PM
Van B   Well, it may be inductive reasoning, but given the...   May 25 2022, 05:45 PM
wonkipop   Well, it may be inductive reasoning, but given th...   May 25 2022, 07:20 PM
JeffBowlsby   Wonk, You deserve an award for this charcoal ca...   May 26 2022, 08:52 PM
wonkipop   Wonk, You deserve an award for this charcoal c...   May 27 2022, 03:53 AM
wonkipop   Wonk, You deserve an award for this charcoal c...   May 28 2022, 01:34 AM
wonkipop   After all that research and thanks to all members ...   Jun 5 2022, 01:18 AM
JeffBowlsby   Niiiice. I see that architects hand... :drooley: ...   Jun 6 2022, 06:50 AM
wonkipop   Niiiice. I see that architects hand... :drooley:...   Jun 6 2022, 03:55 PM
StarBear   @wonkipop [b]@[url=http://www.914world.com/bbs2...   Jul 10 2022, 07:59 PM
wonkipop   great stuff @StarBear looks like you guys had a...   Jul 10 2022, 10:03 PM
StarBear   Yep; darn close to pinning it down, I’d say. Gre...   Jul 11 2022, 06:22 AM
StarBear   @rod911964 Rob - Here's the info we were di...   Jul 11 2022, 01:41 PM
wonkipop   @StarBear [b]@[url=http://www.914world.com/bbs2...   Jul 12 2022, 06:29 PM
Van B   Our cars really were like a beta test for the L-Je...   Jul 12 2022, 09:21 PM
StarBear   Our cars really were like a beta test for the L-J...   Jul 13 2022, 02:18 PM
StarBear   Found another 74 (?) this morning behind a garage....   Jul 13 2022, 02:20 PM
wonkipop   came across another plastic expansion tank 74. clo...   Jul 17 2022, 07:04 AM
StarBear   @wonkipop BTW, what color is yours, and what ty...   Jul 18 2022, 06:52 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 18 2022, 07:50 AM
wonkipop   just been scratching through my files here a bit m...   Jul 18 2022, 08:02 AM
StarBear   @wonkipop Something special made - for you fro...   Jul 18 2022, 10:46 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 18 2022, 04:48 PM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?...   Jul 18 2022, 07:35 PM
StarBear   [quote name='StarBear' post='3016011' date='Jul ...   Jul 19 2022, 06:54 AM
wonkipop   @[url=http://www.914world.com/bbs2/index.php?showu...   Jul 18 2022, 05:17 PM
Van B   @wonkipop how many US spec ‘74 1.8s do you thin...   Jul 18 2022, 05:54 PM
wonkipop   @[url=http://www.914world.com/bbs2/index.php?show...   Jul 18 2022, 06:45 PM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 19 2022, 01:32 AM
Van B   I don’t know how I missed that label lol! Y...   Jul 18 2022, 08:08 PM
wonkipop   I don’t know how I missed that label lol! ...   Jul 18 2022, 08:48 PM
wonkipop   @Van B + [b]@[url=http://www.914world.com/bbs2/i...   Jul 19 2022, 12:12 AM
StarBear   @wonkipop As promised, here's the white font...   Jul 19 2022, 10:44 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 19 2022, 03:17 PM
StarBear   "L" is for L-Jet, obviously.....   Jul 19 2022, 10:44 AM
Van B   First off, you two are ridiculous lol... Second, ...   Jul 19 2022, 11:01 AM
StarBear   Good move, Van. My thought is that 1.8s may be th...   Jul 19 2022, 01:06 PM
wonkipop   Good move, Van. My thought is that 1.8s may be t...   Jul 19 2022, 03:14 PM
StarBear   Great! Works for you so go with it. Can apprec...   Jul 19 2022, 07:05 PM
Van B   Well, I straight up missed this page... http://www...   Jul 20 2022, 09:57 AM
wonkipop   Well, I straight up missed this page... http://ww...   Jul 20 2022, 04:37 PM
Van B   Not really. You said you could figure exactly the ...   Jul 20 2022, 05:18 PM
wonkipop   Not really. You said you could figure exactly the...   Jul 20 2022, 05:22 PM
wonkipop   @davep i mentioned in pm that i had also seen an...   Jul 22 2022, 02:00 AM
StarBear   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 22 2022, 05:34 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?...   Jul 22 2022, 06:02 AM
wonkipop   new data entered into tables on page 1 of thread. ...   Jul 29 2022, 10:25 PM
StarBear   @wonkipop I’m planning on redoing a sheet of t...   Jul 30 2022, 06:49 AM
wonkipop   [b]@[url=http://www.914world.com/bbs2/index.php?s...   Jul 30 2022, 07:07 AM
StarBear   [b]@[url=http://www.914world.com/bbs2/index.php?...   Jul 30 2022, 10:00 AM
wonkipop   [quote name='StarBear' post='3019138' date='Jul ...   Jul 30 2022, 07:11 PM
JeffBowlsby   I was thinking about the charcoal can air supply a...   Aug 5 2022, 06:18 PM
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