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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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JeffBowlsby
post May 26 2022, 08:52 PM
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Wonk,

You deserve an award for this charcoal can research, it’s well documented and clearly presented.

Can’t speak for others but changing the airflow direction thru the can, especially knowing how the can is actually constructed without the long internal supply tube as depicted in the booklets basically creates a short circuit nearly eliminating the intent and actual functional efficiency of the system.

Don’t understand the factory logic for the change. What did they know that is not obvious to us? Did they not see the internal plumbing within the can? I’m inclined to keep with the early air hose routing scheme because it seems like the best technical solution.
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wonkipop
post May 28 2022, 01:34 AM
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QUOTE(JeffBowlsby @ May 26 2022, 08:52 PM) *

Wonk,

You deserve an award for this charcoal can research, it’s well documented and clearly presented.

Can’t speak for others but changing the airflow direction thru the can, especially knowing how the can is actually constructed without the long internal supply tube as depicted in the booklets basically creates a short circuit nearly eliminating the intent and actual functional efficiency of the system.

Don’t understand the factory logic for the change. What did they know that is not obvious to us? Did they not see the internal plumbing within the can? I’m inclined to keep with the early air hose routing scheme because it seems like the best technical solution.


somewhere in my research last year i did come across the details of the actual EPA test procedure for the evap emission system.

this is from memory but i could probably find it again.

but it went something like this.
drive the car for a prescribed period of time, it was a fairly long period of time and i think a certain number of miles were involved and it was a kind of simulation of a typical commute drive.

car then driven into special sealed room and switched off. the room contained hydrocarbon sensors. (70s primitive tech sensors?).

car left in there for prescribed period of time. something like an hour or two.

hydrocarbons detected in the atmosphere of room had to be under a certain threshold of x ppm.

pass or fail.

so the test was for the static phase of the operation of the canister system after switch off. the test was not for a dynamic phase (ie purge). manufacturers were expected to keep a fleet of test cars and monitor the system for 50,000 miles or 5 years. at the time the tests were introduced cars had not had the system installed for 5 years. so that was in the future. but if systems failed in the long term manufacturers would have been expected to replace faulty components under warranty. VW or porsches view would have been replace the canister.

i know how it works in my industry. anything required to be certified is designed to pass the test. nothing to do with the real world. ie a fire rated window that has to be certified to be 1/2 hour bushfire rated is that. if it lasts 31 minutes it passes. if it lasts 29 minutes it fails.

i think the canister is all about that. cobbling up a system, using shared universal parts, to get very different types of cars through the test.

getting a cabied 914/6 or 911 through the test would have been a nightmare? they would have exposed as much cross sectional area of charcoal as they could between the carb connected hose and the fan feed (atm vent) hose. so they plugged that carb hose line into the end of the can with the small plenum created by the spring - there is hot fuel in a carb bowl after switch off thats gassing like no tomorrow?

getting a fuel injected 914 or VW through would have been a breeze.
some fuel vapor coming down a tiny hose from the fuel tank which would have been far less heated or subject to heat after switch off. they would have positioned the open hose to atm (fan) with as much charcoal between it and tank vapor line as possible with a view to the long term life of the can as it would have walked through the EPA test. the hose to the air cleaner has the filter between it and the atmosphere to help it and to "seal" vapors in. the EFI cars just would not have been dumping in anything like the vapor load of a carb car at hot shutdown.

i think the early 4 cylinder 914s just got the system porsche tuned for the 914/6 by default? then someone at the factory woke up and said, hey we are not building 914/6s anymore and we can get the cans to last longer the other way around. one thing is for sure, VW had the penny counting overlords going over everything. they would never have missed a trick where a $ was concerned.

i think there is an element of cynicism involved? in the sense of getting through the certification process number 1 rather than necessarily operating well over 5 years.
and they were cynical.
everyone is.
thats why the EPA caught them out in 73?
and again more recently?

pollution gear is funny stuff. all about very specific govt. authority tests conducted within almost laboratory parameters.

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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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