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Old 07-19-2007, 06:07 PM   #1 (permalink)
jimmy6.2
 
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fuel injection lines

Hi, I dont like the original fuel injection lines, they are in the way when working on the valve covers.
Would it be possible to make new ones?
What are they made of? steel?
Whats the pressure in the lines?
Would be a bad idea to make them of copper or will it crack?

Per

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Old 07-20-2007, 10:00 AM   #2 (permalink)
jdemaris
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Quote:
Originally Posted by jimmy6.2;1889211;
Hi, I dont like the original fuel injection lines, they are in the way when working on the valve covers.
Would it be possible to make new ones?
What are they made of? steel?
Whats the pressure in the lines?
Would be a bad idea to make them of copper or will it crack?

Per
And where would you put them? They need to be all of equal length - because line length affects timing. Not only does the length of each line need to be the same, the total length affects timing. If you make them longer, or shorter, you'd then have to figure out how much the timing has changed and compensate for it.

The OEM lines are thick-wall steel and rated to at least 15,000 PSI burst pressure. Copper is a really BAD idea. So is changing length. And, if you DO change length, you have to get them all the same length, get them tie together to keep them from suffering vibration-cracks, etc. etc.

My general thought is - if you don't like the lines going over the valve covers - get a different diesel. Maybe an in-line Cummins. Even a Ford 6.9 or 7.3 is a little different since the injectors are closer in and vertical.

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Old 07-20-2007, 08:19 PM   #3 (permalink)
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I thought they were ceramic lined?
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Old 07-21-2007, 11:42 AM   #4 (permalink)
monz
 
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Quote:
I thought they were ceramic lined?
All of the injector lines I have seen on these and other diesels were plain steel, no coating on the inside or outside.
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Old 07-21-2007, 12:06 PM   #5 (permalink)
jimmy6.2
 
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Quote:
The OEM lines are thick-wall steel and rated to at least 15,000 PSI burst pressure. Copper is a really BAD idea. So is changing length. And, if you DO change length, you have to get them all the same length, get them tie together to keep them from suffering vibration-cracks, etc. etc.
15000 psi = 1000bar

What is the pressure inside lines? not a 1000bar i guess.
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Old 07-21-2007, 12:10 PM   #6 (permalink)
monz
 
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Typical injection pressure is around 1500 psi. That isn't a constant pressure, of course. That is a pressure pulse when the injector is supposed to fire.
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Old 07-21-2007, 01:49 PM   #7 (permalink)
jdemaris
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Quote:
Originally Posted by monz;1892225;
Typical injection pressure is around 1500 psi. That isn't a constant pressure, of course. That is a pressure pulse when the injector is supposed to fire.
Depending on what year 6.2, the pressure can be set as high as 1950 PSI (134 Bar), with the older long injectors being set at 1500 PSI when new, and as low as 1350 when used.

Many other IDI diesels have injectors set at over 4000 PSI, and a few diesels run injector pressures at 19,000 PSI.

Injector lines are prehardened on the inside,usually by being subject to very high pressures when new - sometimes 50,000 PSI. Line strength is not just about PSI, it is based on "compression-pulsating-fatique" strength. So it gets pretty complicated.
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1982 K10 PU 6.2 diesel,1983 (two) Blazers 6.2 diesel, TH400, 1983 K5 Blazer with 6.2 diesel, 4sp man. OD trans. and Chalet pop-up camper body.
1986 K5 Blazer 6.2 diesel, 700R4 trans.- with Halmark pop-up camper body.
1987 V20 4WD Suburban 6.2 diesel, 1988 K5 Blazer 6.2 diesel, 700R4. 1989 GMC 3/4 ton, 4WD Suburban, 6.2 diesel, TH400 trans.
1991 Suburban 4WD 6.2 diesel 700R4 trans.
1981 (two of them) Chevy Chevette with 1.8 diesel and 5 sp. trans.
1985 Isuzu P'UP 4WD pickup with 2.2 diesel
1991 (Two of them) Volkswagen Jetta 1.6 diesel
1985 Ford F250 4WD ex-cab, longbed, 6.9 diesel
1994 Ford F250 4WD ex-cab, longbed, 7.3 IDI turbodiesel.
1983 Mercedes 300D five-cylinder turbo-diesel
1992 Dodge D200 4WD Cummins turbo-diesel, intercooled with 5 spd Gertrag
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Old 07-21-2007, 04:34 PM   #8 (permalink)
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I understand that I cant use any lines, but it must be possible to get or have made.

Per
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Old 07-21-2007, 05:31 PM   #9 (permalink)
monz
 
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I wouldn't recommend it. The lines are pretty special. It would be much better to just live with the existing lines if the only thing you don't like about them is that it makes it hard to get to the valve covers.

As jdemaris noted there are variations in injection pressure depending on application, the year of the engine, and how many miles are on it. The pressure generally reduces somewhat as the engine is used. Comparatively all of the pressures mentioned above are pretty low. Modern diesels use injection pressures many times higher than the pressures mentioned above. Some of them are now using pressures as high as 80,000 psi.
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Old 07-21-2007, 06:50 PM   #10 (permalink)
Bison
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Quote:
Originally Posted by jimmy6.2;1892537;
I understand that I cant use any lines, but it must be possible to get or have made.

Per
One thing a guy could do, although it requares a little bit of bending of the lines at that point, is to have an extra connector put in the lines where they come out of the intake manifold. i think a diesel pump shop would have these connectors, i never asked if they have them ,but i have been toying with that idea of and on myself. Down in my old country I worked for a shop where we made up a line when one broke, we never installed OEM, was to expensive .

I wonder if it is worth the time and expense for the odd time the valve cover has to come of.

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