Why did the 1.8 engines have L-jet? Options

[VaccaRabite]

Has there ever been a reason Porsche/VW speced L-jet injection for the 1.8 engines instead of D-jet like the 1.7 and 2.0 engines used?

Usually when manufactures do this there are financial reasons for the change. Either they have the same engine on other vehicles they produce, or its just cheaper to use whatever part is being used.

But Porsche didn't use the T4 motor on other cars at the time. And if it was cheaper, they would have done away with Djet on the 1.7 and 2.0. I don't think VW was using l-let at the time for the bus... but maybe?

There has to be a reason that Porsche wanted Ljet on the 1.8.

Zach

[wonkipop]

here is the emission specs on the two different 76 models for the same niche.
as recorded on CARB executive orders.


the 76 (75+) 914 2.0 D jet. (75 2.0 is identical in all respects - same sheet with 1975 on it).




the true 76 MY 912E with L jet.



pretty much the same - egr, airpump, but 912E runs thermal reactor exhausts instead of cat. (Although i have no idea what that all encompassing term - EM = engine modifications means for 914 2.0? (IMG:style_emoticons/default/biggrin.gif) ) suspect reason for reactprs on 912 is porsche still had not developed an exhaust system with a cat that would fit in to limited space available with rear engine layout. 911s also had reactors. same problem?

the 912E version of the 2.0 L also got capacitive discharge ignition. don't believe the humble 914 L jets have got that. dunno about 2.0 L 914s

and as far as i can figure out the hp rating goes like this.
a 2.0L 76 914 had 87 bhp or 88PS (euro standard hp). 88 usually quoted.
a 912E had 86 bhp so maybe 87PS.
lost about 1hp over the 914.
suspect with D jet if they could have made it work even more hp loss.

unlike the 914s porsche did do the test work and development on the L jet 912E.
they ran the test car out of the factory from about mid 75 on. had about 6 months before it went into production to make sure it worked ok.

if they could have i am sure they would have kept going with D jet, for the sake of 6 months of cars. but something stopped them.

as a little side note you can see from the certificates that neither the EGR or the CAT could be warrantied for the full 50,000 miles required. hence the I for inspection condition and i guess the mileage counter that had to go in to the 914s of that time with the CATS. already knew they wouldn't make it through full warranty period........
and i am guessing but i could be wrong you would have got that replacement for free?
as part of having to warranty it for 50,000 miles. i imagine anyone who knows for sure and managed to get that service is probably dead these days. (IMG:style_emoticons/default/sad.gif)