replacement Injector fuel lines for a CIS system
02-28-2002, 09:23 PM
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replacement Injector fuel lines for a CIS system
I wonder if anybody knows where I can get replacement injector lines from the CIS fuel distributor to the injectors for the 78/79 CIS injection 928's. Boy, those fuel lines are itty-bitty and old... (24 years!) they look mighty scarey when I have to loosen or move an injector. Plus, with my supercharger, I am having a little trouble getting enough fuel through them to not run lean because they are so small.
I'd like a larger diameter, or aeroquip-style braided lines... (that would look way sexy). Has anybody done this to their early 928?
I'd like a larger diameter, or aeroquip-style braided lines... (that would look way sexy). Has anybody done this to their early 928?
02-28-2002, 10:11 PM
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Extremely fast Carl....
I doubt this helps much...but I have an airport car sitting in Dayton, Ohio. It is a 1980 Jetta 2 door, and is equipped with the infamous Bosch K-Jetronic [CIS] injection.
I bought this car in Belgium, and brought it to the US. While I had it there, it had a problem with driveability. Basically, if I just drove it down the road, it ran on 3 cylinders most of the time. Floored it worked, at least as best as one can expect from 78 horsepower and an automatic tranny.
I thought for sure it was wires, and scoured Brussels for the best I could find, to no avail. I finaly decided it was the injector, so when I was back in Orlando one day [I work for an airline], I stopped in Autozone and asked for the injector. They had the lines, the injectors, and pretty much a whole engine in stock....
I realize a CIS 928 is not a common bird, but I'd try the obvious places first, if you haven't yet....
Normy
I doubt this helps much...but I have an airport car sitting in Dayton, Ohio. It is a 1980 Jetta 2 door, and is equipped with the infamous Bosch K-Jetronic [CIS] injection.
I bought this car in Belgium, and brought it to the US. While I had it there, it had a problem with driveability. Basically, if I just drove it down the road, it ran on 3 cylinders most of the time. Floored it worked, at least as best as one can expect from 78 horsepower and an automatic tranny.
I thought for sure it was wires, and scoured Brussels for the best I could find, to no avail. I finaly decided it was the injector, so when I was back in Orlando one day [I work for an airline], I stopped in Autozone and asked for the injector. They had the lines, the injectors, and pretty much a whole engine in stock....
I realize a CIS 928 is not a common bird, but I'd try the obvious places first, if you haven't yet....
Normy
03-01-2002, 09:53 AM
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Well you could use brake lines if you can get the fittings to work. Volume will equal more fuel. I have heard that CIS will support up to 450 HP. Not sure how you could kick up the pressure to the injectors with the stock lines. Mine have been pretty rugged as I have changed injectors last year.
Here is a thought, as we all know other cars used CIS. Do all these cars use the same injector? Is it possible to get a higher flow rated unit? 8 of them of course.
Are you actually going lean at full throttle? WOW thats alot of air.
Here is a thought, as we all know other cars used CIS. Do all these cars use the same injector? Is it possible to get a higher flow rated unit? 8 of them of course.
Are you actually going lean at full throttle? WOW thats alot of air.
03-01-2002, 09:39 PM
#5
Carl,
The stock fuel lines should provide more than enough for even a supercharged 928. Remember CIS is a continuous injection system, meaning the injector is spraying 4 times as long as the intake stroke. If your lines are crimped where they turn coming off the fuel distributor, this could account for the lean run. Before replacing the lines you should check for free movement of the air metering plate, control and system fuel pressure and insure the air/fuel adjustments are correct.
Dennis
The stock fuel lines should provide more than enough for even a supercharged 928. Remember CIS is a continuous injection system, meaning the injector is spraying 4 times as long as the intake stroke. If your lines are crimped where they turn coming off the fuel distributor, this could account for the lean run. Before replacing the lines you should check for free movement of the air metering plate, control and system fuel pressure and insure the air/fuel adjustments are correct.
Dennis
03-03-2002, 08:15 PM
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Thank you for all of your replys. I am not running lean... I just am worried as to their age and soft metal alloy.... wondered if anybody new of a replacement that was stronger/newer/better looking.
03-04-2002, 01:15 AM
#7
Carl,
You can change them out with high pressure fuel line hoses but you will run the risk of vapor locking. Believe that is why Porsche changed from hoses to solid lines on the 924's. Another possibility would be to change them to high pressure flex hose and add metal braided covers.
Dennis <img src="graemlins/yltype.gif" border="0" alt="[typing]" />
You can change them out with high pressure fuel line hoses but you will run the risk of vapor locking. Believe that is why Porsche changed from hoses to solid lines on the 924's. Another possibility would be to change them to high pressure flex hose and add metal braided covers.
Dennis <img src="graemlins/yltype.gif" border="0" alt="[typing]" />
