turbo conversion question
Lead Driver
Joined: Mar 2006
Posts: 5,098
Likes: 1,504
From: western SD
I just installed a 94 turbo on my 85. I got the upgrade elbow and 3 inch downpipe from ATS which cost 280. They also had a kit with the o-rings for the pedistel, the grommets for the CDR, and the o-ring seal for the intake snail for 60 bucks. Everything bolted up perfect, except for the Factory air filter housing. The bottom part hit the no. 5 injector line. I had to bend the line to get clearance. I'm smiling now. Tom
Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
I know I'm over thinking this and i know that it does matter but don't get why.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
If the same pressure and the lengths were different the fuel would be delivered at a different time.
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Posting Guru
Joined: Sep 2007
Posts: 2,207
Likes: 1
From: Las vegas
But acording to hydralic theory if you have a colum of uncompressable liquid and a ply presure to one sied the same amout will be instantly aplied along the sides and other end so acording to that it shouldn't matter.
Not saying you're wrong mind you just playing devils advocate here.
One ling i thought of is that the line will most likely have a certain amout of give but on the other hand al the difrent radious bends would cause diffrent amounts of work hardenning, man I sure can over complicate just about anything. I wounder why my teachers hated me.
Not saying you're wrong mind you just playing devils advocate here.
One ling i thought of is that the line will most likely have a certain amout of give but on the other hand al the difrent radious bends would cause diffrent amounts of work hardenning, man I sure can over complicate just about anything. I wounder why my teachers hated me.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
By making all of the lines exactly the same length the fuel delivery times are as close as you can get them to exactly the same amount of time from the IP to the injector when the throttle load changes.
Yes, I know what you are saying about equal pressure, but even tiny differences do add up.
Yes, I know what you are saying about equal pressure, but even tiny differences do add up.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
I think the answer is that the line stretches (expands) a slight amount each time its pressurized since metal is flexible and the fuel is not compressible. This means that lines of different lengths will transmit the fuel pressure pulse at different rates depending on the length of the line. The longer the line, the more the delay will be.
Not by much, but enough to cause a concern of different injection timing from one cylinder to the next.
Not by much, but enough to cause a concern of different injection timing from one cylinder to the next.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
If you pressure test a long enough line, even water is very slightly compressible.
When you start dealing with injection timing and line pressures with fuel, on top of the tubing stretching slightly, you start introducing delay.
When you start looking at each cylinder is firing 3.4375 times a second at 3300 RPM, a few nanoseconds is a very large difference on where the fuel is injected in the stroke in relation to crankshaft degrees .
When you start dealing with injection timing and line pressures with fuel, on top of the tubing stretching slightly, you start introducing delay.
When you start looking at each cylinder is firing 3.4375 times a second at 3300 RPM, a few nanoseconds is a very large difference on where the fuel is injected in the stroke in relation to crankshaft degrees .
Senior User
Joined: Oct 2008
Posts: 127
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From: Greensboro North Carolina
Wow, my head hurts. There is another way that this would effect the flow of things, but holy crap I just thought way too hard about it and now I feel drunk. I am thinking about pneumatic valves, and how they affect things when you use a different one. In reference to Pounds Per Square Inch @ the diaphram and the surface area of the diaphram. Maybe I am thinking backwards. I need beer. 
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Wow, my head hurts. There is another way that this would effect the flow of things, but holy crap I just thought way too hard about it and now I feel drunk. I am thinking about pneumatic valves, and how they affect things when you use a different one. In reference to Pounds Per Square Inch @ the diaphram and the surface area of the diaphram. Maybe I am thinking backwards. I need beer.