Why did the 1.8 engines have L-jet? |
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Why did the 1.8 engines have L-jet? |
VaccaRabite |
May 31 2024, 08:05 AM
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#1
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En Garde! Group: Admin Posts: 13,571 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
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 |
technicalninja |
Jun 4 2024, 09:08 PM
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#2
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Senior Member Group: Members Posts: 1,948 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
Here's the REAL kicker...
High end aftermarket ECU like the Megasquirt Pro that Clay is employing on his Godzilla car can not only do sequential but timed sequential... You can time it from start of pulse, end of pulse, or, most interesting to me, center of pulse. I'll tie center of pulse to LCA intake (intake valve fully open) and end up with the pulse firing INTO an open intake valve during its highest airflow point. If you use a large enough injector, you can have as near to "direct injection" as possible without having to re-design the injector through the cylinder head. Sequential injection that only fires when the intake valve is open is my goal here. This is possible today! The Megasquirt is not stupid expensive either. (IMG:style_emoticons/default/ninja.gif) |
JeffBowlsby |
Jun 4 2024, 09:58 PM
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#3
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914 Wiring Harnesses Group: Members Posts: 8,703 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
All things considered how is direct injection beneficial to our aircooled cars given how it cakes up the valves? I doubt our injectors could tolerate that piston chamber exposure either.
Not a fan of DI. |
wonkipop |
Jun 4 2024, 10:04 PM
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#4
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Advanced Member Group: Members Posts: 4,658 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
All things considered how is direct injection beneficial to our aircooled cars given how it cakes up the valves? I doubt our injectors could tolerate that exposure either. Not a fan of DI. neither am i. sh#t idea. i inherited a 2008 Audi A3 with a 1.8 turbo direct injection engine. fortunately one month before the dog engines with the dud oil rings. i do double frequency oil changes on it to combat timing chain "stretch" syndrome. its low mileage so i have kept it. 64.000 km total. the direct injection was such a dud idea that VW put in two injectors in the third gen of these engines. one direct and one port, the port one being to clean the back of the intake valves. thats 8 injectors for a 4 cylinder engine. (IMG:style_emoticons/default/screwy.gif) we have given mine the subaru cocktail cleanser that you force down its throat and make it run for 30 minutes. known to work. and a whole lot cheaper than stripping off the intakes and walnut blasting as audi will do for you while shaking every last penny out of your bank account. |
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