 Distributor, Calling all L-Jet experts |
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| gfg3 |
 Oct 5 2015, 01:00 PM
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Never Too Old  Group: Members Posts: 117 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None  |
While I was trying to sort out possible vacuum leaks in my '75 1.8L FI (L-Jet) engine I noticed a couple of inconsistencies in the way the PO set up the system compared to what I believe is the correct vacuum setup:
1. The distributor in my car does not have any vacuum advance mechanism or vacuum hose connections. I thought all '75 EC code engines used vacuum advance. Am I wrong? 2. There is no vacuum line to the fuel pressure regulator. Normally there is a T in the line that connects the intake manifold with the decel valve and the fuel pressure regulator. Decel valve is hooked up correctly, but the fuel pressure regulator just has the in/out fuel lines, vacuum port is open. Can it work correctly like this? George |
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| Dave_Darling |
Oct 6 2015, 12:28 PM
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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D-jet does not reference its fuel pressure to manifold pressure, there is no vacuum line connected to the regulator. (Perhaps they hadn't given that aspect any thought when they designed it?)
Since the pressure in the manifold is highest at WOT, I am pretty sure that the fuel pressure in the L-jet cars is higher at WOT than at idle. The object of the manifold-referenced fuel pressure regulator is to keep the pressure drop across the injector constant. The original distributor on an L-jet car should have a vacuum dashpot on it. If there is no provision on yours for a dashpot, it may not be the right one. (I could be wrong about the part number.) That said, you don't specifically need the correct distributor to run the engine, the way you do with D-jet. Since L-jet takes its "time to inject" signal from the ignition points, it can work off a standard distributor. If you have the (cheap) "009" distributor, you might wind up having to replace it or modify the advance curve in order to get everything working as well as possible. (The stock 1.8 distributor also has a Bosch part number ending in "009", hence my possible confusion.) --DD |
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| gfg3 |
Oct 6 2015, 02:20 PM
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Never Too Old Group: Members Posts: 117 Joined: 5-January 15 From: Southern Virginia Member No.: 18,295 Region Association: None |
QUOTE(Dave_Darling @ Oct 6 2015, 02:28 PM)  (The stock 1.8 distributor also has a Bosch part number ending in "009", hence my possible confusion.) --DD Dave: Now I am confused. According to the PET and Haynes Repair Manual, the proper Bosch distributor for a '75 1.8 FI is 022 905 205 series which has a dashpot. I agree that my 0 231 178 009 without a dashpot is probably a VW replacement though. George |
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Posts in this topic
gfg3 Distributor Oct 5 2015, 01:00 PM
sean_v8_914 kinda....not really
dizzy should have a vacuum po... Oct 5 2015, 01:18 PM
gfg3
kinda....not really
dizzy should have a vacuum p... Oct 5 2015, 02:27 PM Dave_Darling The distributor part numbers sounds right. (That... Oct 5 2015, 04:46 PM gfg3
The distributor part numbers sounds right. (That... Oct 6 2015, 06:08 AM AndyB
The distributor part numbers sounds right. (Tha... Oct 6 2015, 10:49 AM gfg3
I would recommend that you make sure all your hos... Oct 6 2015, 11:41 AM Racer Chris
If it isn't, the fuel pressure will always b... Oct 6 2015, 11:20 AM barefoot
If it isn't, the fuel pressure will always ... Oct 6 2015, 11:56 AM Racer Chris
Don't know about L-jet, but D-jet should have... Oct 6 2015, 12:23 PM barefoot
Don't know about L-jet, but D-jet should hav... Oct 6 2015, 03:10 PM pete000
If it isn't, the fuel pressure will always ... Oct 6 2015, 12:17 PM rhodyguy That was GREAT Dave. Well put. Oct 5 2015, 07:06 PM porschetub
That was GREAT Dave. Well put.
Well done ,alway... Oct 6 2015, 02:38 AM Racer Chris
Since the pressure in the manifold is highest at... Oct 6 2015, 12:52 PM Racer Chris
022 905 205 series
That's the Porsche part... Oct 6 2015, 02:51 PM gfg3
That's the Porsche part #.
Bosch has a differ... Oct 6 2015, 03:41 PM |
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