i was wondering if a stock turbo from a 1993 idi 7.3 turbo will work on my 1986 6.9?

 

Yes it will and everything will bolt up like it was made for the 6.9.


Probably should make a new downpipe though, the stock smashed downpipe don't flow very good.

 

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

 

i have always herd you are never to change the shape of the metal injection lines cause it will change you timing on that one cylinder, and cause it to run rong.

 

The line length is what is critical.

The route is not.

Bending can cause issues though if it was much of a bend.

 

One thing I've never quite under stood about that is that fule dose not compress and the injector lines are always full of fule are they not? So if fule dose not compress then the thery of hydo dynamics aplies. If presure is aplyde to a fluid it aplise the same amout of presure in all directionas instantaniously along the entire area of luid so why dose the length matter?

I know I'm over thinking this and i know that it does matter but don't get why.

 

If the same pressure and the lengths were different the fuel would be delivered at a different time.

 

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.

 

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.

 

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.

 

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 .

 

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.

 

Stay away from bud I have first hand knowledge your head will hurt worst.lol

 

Silver Bullet Baby!

 

You better hurry everybobys hoarding ammo.