vacuum hose routing question Options

[L-Jet914]

I was installing my new ignition and FI harnesses today and I decided to look back at the vacuum hose routing diagram on Jeff Bowlsby's website. I knew my vacuum hose routing had been modified by whatever technician worked on my father's 74 914 1.8 years ago. I noticed that they teed the vacuum retard side of the vacuum advance into ported vacuum off of the intake plenum. According to the vacuum routing hose diagram, it's supposed to be connected to the rear port of the throttle body (which only gets vacuum after the throttle plate moves off idle). Would there be any reason the technician did this? I will end up rerouting the vacuum hose to the proper location. I'm just curious as to why it was modified for whatever reason. So would my 74 1.8 be considered a early or late 1.8? According to the late diagram and the throttle body that is in the car, the hose should route to the front port instead of the rear port.
The part number on the throttle body in the car 022133067C which fits either a Super Beetle 75-79, 76-83 Bus, or 83-84 Vanagon (two port t-body). According to the PET on AA's website shows two different throttle bodies 022133062L or 022133062S for California spec 1.8L 914s. The Porsche PET does not list a throttle body part number for the 1.8, only the 1.7 and 2.0s. Curious as to why someone would put the wrong part number throttle body on my 914, though it does have the 3 pin throttle position sensor. Port setup would be indicative of late 74 because the required port (front of throttle body pointing toward front of vehicle) is behind the throttle plate.

[wonkipop]

@L-Jet914

if you think i have mixed up the letter codes on the engines from 74 to 75 i haven't.

for quite a while the codes confused both jeff bowlsby and i.
we thought they ought to follow the logic of an A or a would indicate california and a B or b would indicate 49 states. but thats not the logic they used.

then i realised why one day.

an EC-A california 74 becomes an EC-b california 75.
and the EC-B 74 49 states becomes EC-a 75 49 states.
and the reason is simple.

an EC-A is essentially the same as an EC-a in terms of design.
despite the first being the california compliant design in 74 and the 49 states in 75.
the germans did their coding on pure engine design rather than leaving the code to indicate which state year to year. design stayed pretty much the same as was called the A or the a. where it complied changed.

same goes for the EC-B and the EC-b from 74 to 75.
its essentially the same design except they substitute in an EGR in place of vac timing advance. but they activate the EGR the same way they activated vac advance.

you got to think like a german to understand how they were naming things. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif)