1974 914 1.8, the mystery of the EC-A and EC-B Options

[wonkipop]

ENGINE BAY BLOWER FAN.

On the data collected to date it appears the engine bay blower fan set up was updated during the course of MY 1975.

examples dating from 08/74, 09/74, 10/74 & 11/74 retain the single hose blower fan with a hose feeding to the left hand side heat exchanger only that was used for the 1974 MY.






examples dating from 12/74 and on to end of MY production used a revised twin hose blower fan with dual hoses feeding to both the left and right side heat exchangers.
the adaptor piece attached to the fan unit appears (based on an extant original example) to have been a VW part used on the 411/412 variant.






data collected points to a changeover date late nov 74 or early dec 74.

[wonkipop]

EVAPORATIVE EMISSIONS SET UP.

it has previously been determined that VW & Porsche revised the hose connection set up to the charcoal cannister at the time the cannister was moved to a location on the rear firewall of the engine compartment from its previous location in the front trunk.
this ocurred during approx the third week of nov 1973.
refer to pg 3 of this topic where the emissions warranties and associated schematic diagrams are traced from 73 MY to 76 MY.

the 1975 1.8 L Jetronics used the same hose connection schema as the 74 L jets.
the charcoal cannister was repositioned in 1975 directly adjacent to the battery tray.
this was possibly done to facilitate space for the EGR valve and plumbing for the california market EF-16 and standardized across both engines.

[wonkipop]

EF-15 & EF-16 VACUUM HOSE DIAGRAMS








Refer to page 3 of this topic for the vacuum hose diagrams for the 1974 L-Jet EC-A and EC-B engines previously published here in 2022.

@JeffBowlsby - here are your vac hose diagrams for the 75 L Jets.
sorry for the 3 year delay but it took that long to accumulate data that i could trust before i did them. (IMG:style_emoticons/default/biggrin.gif) + i am enjoying a nice lull in arch activities and its spring time - and i felt like drawing. dusted off the drawing board and put away the computer.
i sometimes wonder if technology has really taken us into a future whenever i get my old paraline out and a packet of felt tip pens. (IMG:style_emoticons/default/beerchug.gif)

[L-Jet914]

@wonkipop I found a 74 1.8L hiding on Facebook Marketplace. It has the appearance group package and 607 on the engine tin (right side by cylinder 4 where the evap canister fresh air hose connects.) No vin was pictured.

[wonkipop]

@wonkipop I found a 74 1.8L hiding on Facebook Marketplace. It has the appearance group package and 607 on the engine tin (right side by cylinder 4 where the evap canister fresh air hose connects.) No vin was pictured.

@L-Jet914

thanks mate. (IMG:style_emoticons/default/biggrin.gif) with all that research we did you sure can spot em now.
607 would be as you say an appearance group car. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif)
californian delivered too.

pity we can't get more info to add to the table of examples.
BAT is very good for that. usually gives a trove of info for a car. (IMG:style_emoticons/default/beerchug.gif)

[wonkipop]

a recent topic by a member with a restored 74 2.0 SE brought to light yet another progressive change through MY 74.

windscreen washer bottles.

info from the L Jet files suggests 3 types of bottle were used on 74MY 1.8 L Jet cars.

1. white translucent bottle with red (pinkish) screw collar.
2. white translucent bottle with matching white color screw collar.
3. white translucent bottle with blue screw collar.

1.8 L Jets were produced from very late Oct 1973 until June 1974.


1. white translucent bottle - red (pinkish screw collar).
only one example on file. a very early 1.8 amongst first off liine. possibly first day of production 30/Oct 73 vin month 11/73. car very original - excellent condition.
in terms of L jet cars likely very rare.




2. white translucent bottle - matching white screw collar.
a number of examples emerged of this type. they appear to have been restricted to vin month 11/73. November 73.








3. white translucent bottle - blue screw collar.
this bottle appears in production month 12/73 and appears to have been used throughout all months after to end of 74 production in 06/74.

12/73




01/74




02/74

1.8 L jet


2.0 Creamsicle



03/74





04/74





05/74





06/74

[wonkipop]

eariler in 74 MY (august 73 thru to late oct 73) when the L jet was not yet in production, and USA market 2.0s exclusively came off the line i had a couple of examples but nothing extensive as it is L jets that i have documented.

09/73 74 2.0 red collar.


10/73 74 2.0 white collar


don't have many examples of 2.0 on file to conclude firmly but indication is that red collars may have been used from 08/73 until some time late in oct 73. interestingly this example above of white collar in oct 2.0 matches up with white collars nov 1.8s.
but there is one example of a very early red collar 1.8. this probably says that factory went from red collars towards end of oct and into white collar batch and there are a few cars right on the boundary of the changeover that can be either red or white at this time, whether late first "half model year" 2.0s or very early 1.8s.

[wonkipop]

beyond 74 MY --- 75 MY cars.

only have two examples on file of 75 L jet bottles.


11/73 75 1.8
01/75 75 1.8

not enough examples to be conclusive.
but highly probable blue collar bottles were used thru 75.

EDIT - have trawled through my files further and then searched a little more through BAT for a couple months i did not have. have fleshed out 75 bottles.

solid run of blue collar bottles until around 04/75 when bottles with white collars creep back in.

07/74 blue




08/74 blue





09/74 blue




10/74 blue




11/74 blue




12/74 blue




01/75 blue





02/75 blue




03/75 blue




04/75 white. or could be blue. difficult to be sure.




05/75 mixed white + blue

blue

white



06/75 no examples found to date.


notes
- the appearance of white bottles in the few examples i have during 04/75 and 05/75 correlates with the last year 76MY cars. there appears to be a mixture of white and blue bottles used during the short 5 month production run of the last of the cars.
- you can also tell from Vin numbers that production on the 75 model year cars slowed down noticeably during the 75 calendar year production.
- my hunch is that the factory began to use up remaining parts stocks around this time from early in calendar year 1975 on 75 MY cars until the end of production in december on 76 models.
-i have found a few examples of 76 cars spread through the months of production which show this mixture of bottles. will post in a separate addition to the topic.

[wonkipop]

for 73MY, prior to 74 L jets.

2 examples of 1.7 cars from my files.

03/73 73MY 1.7


07/73 73MY 1.7


not enough examples to conclude firmly.
but perhaps red collar bottles in use for 73MY.


EDIT - further example i dug up from files.
73 MY 1.7 - an extremely early car off the production line.
its dated 06/72 on VIN and is 4732900126 - probably second day of production given the Vin #.

red bottle.



failing a good spread of original condition cars, which i don't have for 1.7s, just a few outstanding examples i filed away in relation to seeing how much changed compared to L jets i'd guess that pretty much all the 73 cars had the red collar bottles, but who knows for sure. (IMG:style_emoticons/default/biggrin.gif)

[wonkipop]

for a laugh and also plain curiosity i kept travelling forward into 1976MY on the water bottle journey.



09/75 white (plain vanilla)




10/75 white







11/75 white, blue, red.








12/75 white, blue





looks like they were using whatever was left around in stock and throwing them at the cars randomly depending on the box they opened?

also looks to me like this might have been going on as early as the last two months or so of the production of 75MY cars as well as the plain white bottles creep into those cars for the later months of production.