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> Why did the 1.8 engines have L-jet?
VaccaRabite
post May 31 2024, 08:05 AM
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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
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wonkipop
post Jun 2 2024, 04:46 PM
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i might add @technicalninja
there is very little written about the history of Ljet and its development.
even by bosch themselves.

its possible texts exist in german and are held in technical universities in germany.
but i have not found anything in searches.

i don't even know who the main mind behind it was.

but its a classic bit of avant garde modernist thinking.
its called inversion.
you rigorously observe the opposite principle.
you force yourself to think the opposite way from the way it is.

thats basically what they did.
thought of it as the opposite of D jet.
thats a very smart way to go about things.

regarding australia and lumping it in with the rest of the world.
very american attitude. no offense taken. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/biggrin.gif)
post WW2 australia is riven politically and economically by two tensions.
the establishment tied to the british upper ruling class and the aftermath of its origins as a colony and their interests in the "mother" country.
and a new emergent group allied to the United States and its vision for the pacific post WW2. despite the awfulness of WW2 and the aftermath of the Japanese being the enemy Australia was one of the first countries to really open itself culturally and economically wit Japan. we supplied them with iron ore etc etc.
we got all their cars before you guys.
we were the guinea pigs for the japanese export car market.
it all came here and got tried out before it was sent in big numbers to you guys.

i believe some of the earliest datsun 240Zs ever made came to australia before they even hit the domestic J market. it helps to be right hand drive when it comes to japanese product.

secondly a massive immigrant population post WW2 of greeks, italians, germans. lithuanians, russian jews. you name it fostered the import industry of european cars.
alfas, fiats, lancias, VWs, Porsche, Mercs, Citroens, Panhards, on and on.

the only carmakers to suffer defeat were you guessed it. the mother countries rolling junk piles. morris, austin, shaguars, etc.
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Posts in this topic
VaccaRabite   Why did the 1.8 engines have L-jet?   May 31 2024, 08:05 AM
930cabman   Bosch made them a deal they could not refuse :be...   May 31 2024, 08:29 AM
brant   Djet came out 1970 or earlier Ljet didn’t come ...   May 31 2024, 08:40 AM
Van B   It was the guinea pig for the FI system that was t...   May 31 2024, 08:44 AM
technicalninja   Progress... The 1.8 was born AFTER Bosch created ...   May 31 2024, 08:45 AM
JamesM   The D-Jet was rare enough that I have never had ...   May 31 2024, 03:18 PM
wonkipop   Progress... The 1.8 was born AFTER Bosch created...   May 31 2024, 04:48 PM
Maltese Falcon   Also known as the Bosch 'Barn Door efi. N/Den...   May 31 2024, 08:59 AM
Root_Werks   Thought I read someplace the 914-4 2.0's would...   May 31 2024, 10:03 AM
JeffBowlsby   D-Jet was not the first EFI, but it was the first ...   May 31 2024, 10:05 AM
dr914@autoatlanta.com   more modern, simpler and more emissions friendly ...   May 31 2024, 10:49 AM
wonkipop   more modern, simpler and more emissions friendly ...   May 31 2024, 04:02 PM
wonkipop   there is more to this too. there was a rival propo...   May 31 2024, 04:21 PM
wonkipop   there is another reason for L jet and it being nec...   May 31 2024, 06:47 PM
wonkipop   the member here who cracked all this open was @L-...   May 31 2024, 07:12 PM
L-Jet914   the member here who cracked all this open was @[...   May 31 2024, 08:24 PM
wonkipop   [quote name='wonkipop' post='3148575' date='May 3...   May 31 2024, 09:42 PM
L-Jet914   I can see why they left the vacuum hose on the adv...   Jun 1 2024, 08:03 PM
wonkipop   I can see why they left the vacuum hose on the ad...   Jun 1 2024, 08:51 PM
wonkipop   @technicalninja here you go for some "world...   Jun 1 2024, 09:30 PM
technicalninja   @wonkipop Thank you for all of your knowledge...   Jun 2 2024, 07:06 AM
JeffBowlsby   No ruffled feathers here...we are here in part to ...   Jun 2 2024, 07:58 AM
technicalninja   Druckfühlergesteuert... Now, there's a mouth...   Jun 2 2024, 08:14 AM
JeffBowlsby   Thanks! Then there was also Rochester Ramjet ...   Jun 2 2024, 08:21 AM
technicalninja   And here's the REALLY sad part... Just before...   Jun 2 2024, 08:32 AM
wonkipop   @technicalninja mr. b (Jeff Bowlsby) knows every...   Jun 2 2024, 04:34 PM
wonkipop   i might add @technicalninja there is very littl...   Jun 2 2024, 04:46 PM
wonkipop   @technicalninja - re first fuel injection made in...   Jun 2 2024, 05:00 PM
technicalninja   Two ways to measure load on an engine. Manifold va...   Jun 2 2024, 05:13 PM
wonkipop   Two ways to measure load on an engine. Manifold v...   Jun 2 2024, 05:43 PM
L-Jet914   [quote name='technicalninja' post='3148834' date=...   Jun 2 2024, 07:17 PM
wonkipop   @L-Jet914 yeah - in a similar vane (no pun intend...   Jun 3 2024, 12:47 AM
wonkipop   ps @technicalninja one of the cars that did hav...   Jun 2 2024, 05:58 PM
wonkipop   @technicalninja and anyone else vaguely interest...   Jun 3 2024, 04:31 AM
VaccaRabite   So L-jet was on VW buses and 412s starting in 1974...   Jun 3 2024, 06:53 AM
wonkipop   So L-jet was on VW buses and 412s starting in 197...   Jun 3 2024, 12:41 PM
mrholland2   So if this was the case: i suspect that no matte...   Jun 4 2024, 10:06 AM
wonkipop   So if this was the case: i suspect that no matt...   Jun 4 2024, 04:37 PM
wonkipop   So if this was the case: i suspect that no matt...   Jun 4 2024, 11:09 PM
L-Jet914   So if this was the case: i suspect that no mat...   Jun 6 2024, 01:06 AM
wonkipop   [quote name='mrholland2' post='3149086' date='Ju...   Jun 6 2024, 03:39 PM
L-Jet914   [quote name='wonkipop' post='3149230' date='Jun ...   Jun 6 2024, 06:25 PM
brant   your logic makes sense... but I would guess the st...   Jun 4 2024, 10:35 AM
JeffBowlsby   Djet is bank fire. 2 banks. For the 914, it’s ...   Jun 4 2024, 01:20 PM
wonkipop   Djet is bank fire. 2 banks. For the 914, it’s...   Jun 4 2024, 04:00 PM
technicalninja   All the L-jet I am familiar with is batch in the s...   Jun 4 2024, 01:38 PM
ClayPerrine   All the L-jet I am familiar with is batch in the ...   Jun 4 2024, 01:54 PM
brant   By now All the forms have changed likely Ha…. ...   Jun 4 2024, 08:52 PM
wonkipop   By now All the forms have changed likely Ha…. ...   Jun 4 2024, 09:50 PM
technicalninja   Here's the REAL kicker... High end aftermarke...   Jun 4 2024, 09:08 PM
JeffBowlsby   All things considered how is direct injection bene...   Jun 4 2024, 09:58 PM
wonkipop   All things considered how is direct injection ben...   Jun 4 2024, 10:04 PM
technicalninja   All things considered how is direct injection ben...   Jun 4 2024, 10:28 PM
technicalninja   Now, I wouldn't try to add it to an engine tha...   Jun 4 2024, 10:54 PM
wonkipop   here is another twist on it that happens when you ...   Jun 4 2024, 11:29 PM
technicalninja   One final note on DI reliability... A good friend...   Jun 4 2024, 11:30 PM
wonkipop   @L-Jet914 yeah thats the grey area then the depa...   Jun 6 2024, 10:01 PM
wonkipop   here is the emission specs on the two different 76...   Jun 6 2024, 10:58 PM
StarBear   CD capacitive discharge - could that be the ignito...   Jun 7 2024, 07:04 AM
technicalninja   Those are resistors, not capacitors. Capacitors a...   Jun 7 2024, 07:34 AM
wonkipop   Those are resistors, not capacitors. Capacitors ...   Jun 7 2024, 04:30 PM
technicalninja   The early use of CDI ignition was single strike (m...   Jun 7 2024, 09:46 AM


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