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Home > A-Series EFI / Injection > The 5 port way forward with phase (cam) sensing.

Rod S

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Rural Suffolk

On 26th Jan, 2009 evolotion said:

can see 2 srips of metal either side of each injector with cap-head's top and bottom :)


Yes, It looked to me as if the cap heads were holding the wire locks.....

Not that that is wrong... do the maths at 1 bar on a 14mm injector mounting and I get only 15N (I could well have done the maths wrong though:))..... so perfectly adequate if that is what we are seeing.

Schrödinger's cat - so which one am I ???


TurboDave16V
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SouthPark, Colorado

ha ha ha - You have got the maths very wrong. You need to think about the pressure in the fuel rail at 1 bar boost, plus the 1 bar in the intake...

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



robert

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uranus



On 26th Jan, 2009 evolotion said:



On 26th Jan, 2009 TurboDave said:
It looks like they're held in place with bits of welding rod / wire...

can see 2 srips of metal either side of each injector with cap-head's top and bottom :)


well done dennis ,you get the tattie scone ,
yes i made a top hat from a rostyle nut drilled out ,then welded a tiny nut on either side ,and two ally straps per inj .
its taken 20 psi no probs ,although it has launched the intake plhenbylliumum off the top on occasion when its back fired .

Edited by robert on 26th Jan, 2009.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM


Rod S

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On 26th Jan, 2009 TurboDave said:
ha ha ha - You have got the maths very wrong. You need to think about the pressure in the fuel rail at 1 bar boost, plus the 1 bar in the intake...


No.......

I'm looking at how the injectors are held in the manifold/runner.

Pressure in the fuel rail is irrelevant if the inlets are connected by flexibles and we are looking at the retaining force for the injector. It's only the manifold/runner pressure that's relevant towards pushing the injectors out of their housings. The fuel inlet pressure will be zero where it is "squirted" into the manifold.... there will be little to zero reaction force.

Schrödinger's cat - so which one am I ???


TurboDave16V
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oh, my bad - I thought you were talking about the idea in roberts picture...

The force required to hold fuel rails in place is surprisingly high on a 'conventional' setup - which is what I thought you were illuding to.

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



Rod S

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No, my problem is if I put the injectors at varing angles, I can't get the inlets in line so I can't build a simple fuel rail that will push on all four together (and then be clamped in place to react against the 3 bar fuel pressure plus manifold pressure).

If I use Robert's solution, I can deal with the flexibles (inlets) but it wasn't quite clear from the photo how the injector/manifold retainer was dealt with...

I think Robert has clarified, but I'm still thinking what will be best for me....

Schrödinger's cat - so which one am I ???


miniswordsman

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Pueblo, Colorado, USA

Hello all,

I'm really new to this 5-port injection scene, just at the mock up, think about it and come up with the money phase. But according to the mock up done by Rod S. with the injectors one on top of the other,(see The 5 port way forward with phase (cam) sensing, page 1) could you not use two fuel rails? One rail up top, controlling two injectors one one code, and a second fuel rail running on a second code/board?

-James


miniswordsman

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Pueblo, Colorado, USA

Or connect the electronics up, tell the computer to use injector 1 and 2 at set timing, and use injector 3 and 4 at set timing?

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