Inlet Manifold Design
Turbo Mini Forums

hmmm i see... looks like side by side on the top axel maybe at a 10 ish degre angle to each other ?

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

I'm now on version 11 of this!

The attached is the latest.

I'm still not going to put the injectors side by side because it may favour one particular cylinder when only one of the injectors is in use.

The other obvious question is why the two bends, rather than a straight pipe? Well, I want the maximum length of runner and although I could push the plenum further back, it will create problems with the throttle body and the clutch cylinder.

The two injectors are very much the same distance from the valve and as close as possible. The upright injector is firing across the air flow to some extent but not as bad as the previous design.

I've put some spare injectors bosses on the back of the runner, so we can try different setups.

Attachments:

16.44kb

Edited by Paul S on 18th May, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That looks interesting however I'd be tempted to look at putting the upper, currently unused, bosses at a slight angle in such a way as the spray patterns from a pair of injectors would, under static conditions, intersect somewhere in the middle of the runner.
I'd prefer that position to the upright one.

Would that clear the plenum?

Really should start thinking about this more myself.

Every day is a school day ...........

How fast and how expensive ...... the same question...

I've started cutting metal, so any further thoughts would be appreciated.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

If you could get injectors with a spray pattern similar to the injector on the right at http://www.mmcompsys.com/download_zone/4_f...co_spray_01.pdf
for the injectors at the top, it would make things much better. Actually, the same would be true for the unused boss at the back.

Other than that, I think you'll have to find out how it works. However, I think you're heading in the right direction with this setup.

Jean

http://www.jbperf.com/

Good link Jean...

Really interested in how well all this works Axel .... I think you'll get a good result with this, especially if you can use the back bosses rather than the upright ones.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Thanks for the comments.

I'll see if I can get the bosses at the back closer and at better angles, then I wont need the upright ones.

I'm cutting flanges today and given the poor weather, I'll probably start cutting the bosses and runners tomorrow as I've got next week off.

If the weather stays bad all week, I should get it done.

Small compensation for not going hill walking in the Auvergne, but the weathers bad over there as well.

Edited by Paul S on 27th May, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Right, Version 12 signed off for manufacture.

Attachments:

15.48kb

Edited by Paul S on 27th May, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That looks great! I'm looking forward to see how this will work.

This version has really good aim for both injectors and the difference in distance is minimal. That should give great results and be much more straightforward for tuning when going from unstaged to staged injectors.

Jean

http://www.jbperf.com/

Edited by Paul S on 27th May, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Axel ...... not a critism just a question ... is there room for a double fuel rail back there?

The Pico style injectors probably help by being smaller but if you can get those in then fair play mate ....

Looking good, as Jean says should be quite simple to get running

Every day is a school day ...........

How fast and how expensive ...... the same question...

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

you could allways run a pipe to each inj like this axel .

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

I'm going to machine some of this aeromotive fuel rail:

http://www.demon-tweeks.co.uk/products/Pro...&pcode=PSI14107

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That's a lot of wonga!

Search for Ross fabrication or the like on ebay USA. I think you'll save a bit over Demon Theives pricing (especially after VAT and delivery!

And it is too big! 5/8" ID.

After further deliberation I'm going to make something up from some stainless tube and machine some bosses and weld them on.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

A bit of progress:

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Out of interest how high did you set the tig to to weld that?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks,

I have convinced myself my welder hasn't goot as much oomph as it did when i first got it, as i'm about to do some stainless welding this should give me a reference.

A bit more done today:

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Silly question 1 - is this going to fit????

Silly Question 2 - how about a thinner wall for the 6" tube? That can't be light LOL!

I think the angle of the shot exagerates the size of the plenum.

It will fit. I've just checked again, but it's no higher and further back than a standard air filter.

It's not 6", its 4" diameter and 2mm thick. I could source 1.5mm thick tube but the weight difference would be insignificant in my road car.

Given that it may, at some point in its life, have to handle 30psi boost, would any thinner be thick enough?

Edited by Paul S on 30th May, 2007.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

neat hole cutting and fab axel , um do you think that maybe no 1 inlet will get a bit of velocity induced lower input than no 2 ,with 1 being so close to the feed pipe ? just a thought,a cone inlet woiuld help .


well done cracking on in a fine manner .

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

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."