I am having a hard time getting a clear vision of how my injector rail (or even seperate lines) are going to clear the TPS on my 5.0L Mustang throttle body.
I know that the ideal angle is 45 degrees, but a few have installed them at 90 degrees. What if any issues will I have by using (for example) a 60 degree angle?
Another interesting thought is to install the TB before the turbo inlet. That would allow me to do just about anything including using 2 smaller injectors per cylinder (I am using E85 and big injectors are $$$).
Any thoughts???

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For those who have any questions about running the TB before the turbo here is the link that put the idea in my head.

http://www.msefi.com/viewtopic.php?t=25 ... urbo+inlet

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I would probably not be too concerned about fuel injector angles other than the "ideal" 45°. The MPFI versions of the 2.2 & 2.5 engines use a very nonstandard injector angle relative to the intake port, and those engines run well. The injector angle is specifically mentioned as a concern in the SAE paper on those engines, but testing is said to have shown the nonstandard angle didn't adversely affect anything. I don't remember what the angle is, because I can't find the paper at the moment.

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Too many people who were born on third base actually believe they've hit a triple.

When you get down to it, the "ideal" injector angle isn't 45 degrees - it's pointed straight at the back of the intake valve, whatever angle that is. However, such an angle is nearly impossible to achieve on a slant six anyway. I wouldn't worry about it too much. My slant six has about a 45 degree angle, but the biggest concern I could see is that you'd have more fuel sticking to the walls.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

You should be able to find some shots of the injector and the addapter plate.

http://slant6racer.mysite.com/?refcd=WSUOWS080630NE03

Will,
After looking at your pics I see exactly what my concern is. It looks like you can barely slip a piece of paper between your rail and adapter plate.

My bungs should be here by the end of the week. I found some used injectors for mock-up and I will see what I end up with for room.

I am surprised I didn't get any comments on placing the TB before the turbo. I figured I would get some comments . The world is flat you know

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Only comment on the TB before the turbo is to make sure you have the right seals in your turbo. The compressor will see vacuum in that set and the wrong seals will draw oil into the intake.

Pretty sure that was noted in your link, so I didn't think it was necessary to mention.

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'74 Duster 360, factory 4 speed car

How does a turbo effect the spray pattern? I guess what I am getting at is will forced induction make up for any injector positioning compromises? If the runner is under pressure it will force the fuel into the cylinder when the valve opens anyway, wont it?

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As long as your fuel pressure regulator is a 1:1 type - 1 more psi of fuel for 1 more psi of boost - the boost will not have a very large effect on the spray. A regulator that's not boost referenced would be trouble.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

There is a practical limit on injector angle depending on the injector itself - tilt it too close to the manifold and the body may smack it. The injectors I use have a wider body then where the end the fuel exits. Just something to think about - if doing custom work decide on & buy the injectors first if your going to be using radical angles.

You can get around this by building a longer pod, but then the fuel will hit the pod walls, and cause the rail to be even closer to the throttle body.

Hi, I milled and wasted two manifolds to get the best angle and spray pattern.I ended at 35 deg. With about 1 inch between the throttle body and the fuel rail.Hope this helps Max.

You need to use injectors that are the same as you plan to use for your mock up as there are 3 lengths of injectors and a couple different diameters.

Matt, have you been following this thread http://www.msefi.com/viewtopic.php?t=24 ... c&start=20

This idea is very interesting.


EDIT: for some reason my link goes to page 2. So go to the previous page to get up to speed.

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