Inlet Manifold Design
Turbo Mini Forums

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."

LOL ..... once set fire to my overalls ... that I was wearing!!!! Autodarkening helmets are a god send and a bloody liability in similar measures!!!

Looking good though, can't wait to see it finished

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

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

Why not stick the inlet to it in the middle of the runners? This is how mine is schemed out - I actually have a 2" dia 90-degree coming out of the front of the plenum tube, and the flange on the end for the TB. You end up with a lot more room this way - and uses the 'dead' space between plenum and rocker box.

Aside from that - it all looks good. :)

oh - I looked at it again - and it doesn't look that bad sizewise; I think its camera trickery makes it all look bigger.

I'd have thought 1mm wall would have taken even 30psi? The math is pretty easy (remembering the equations from college days isn't - but it's a well used example in text books I recall)???

You're assuming that my welding skills will manage 1mm

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."

yes dave thats whet i did on the tvr shown in a pic earlier ,but hey if its not giving a good mix distribution ,axel can do version 28 !!

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

Hi,
Coming along nicely.
How about a support bracket to the engine from the plenum to stop any vibration problems? I think the middle feed's a good idea too.
Cheers,
Gavin :)

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I think that the middle feed idea is very good.

I've mocked it up on the bench, but i'm struggling to find room for the throttle body.

This is the TB:



As you can see, it is quite wide at 130mm and 90mm long. With the middle feed, this has to go at the front of the engine because the pipe has to run very close to the rocker cover.

I'll sleep on it.

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."

heres what i did on the tvr axel , interestingly , it does run slightly leaner on the far side cyl 1 and 2 due to the inertia of the flow biasing towards these two .

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

Did you get any problems due to the TB being a long way from the plenum?

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."

heres the bike plenum ,this works very well and has a nice even colour on the plugs .

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

no not really it was fine ,but bear in mind ,its 3,5 litres with a reasonable bottom end cam .

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

Well it is certainly possible to fit it in with the TB at the front of the engine.

BUT, you create another problem as the TB is sitting 3" offset from the Intercooler inlet with no room to adapt.

I think I may compromise and stick with the original design.

This is where CFD comes in useful. If only my CAD skills were good enough, I've got the CFD software to model this!

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."

I can't let this go yet.

I've just mocked up the Intercooler and throttle body in the engine bay.

The good news is that the TB will fit above the clutch housing and although it a tricky route for the pipes that will have to be made up on the car, it looks promising.

Just need to blank off the clutch housing breather. I'll add another breather in the dizzy hole.

The only remaining issue I have is the air will enter the plenum in the centre, but it will have just gone round a 90 deg bend and its velocity profile will not be symmetrical.

Will it favour the right hand cylinders????

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."

I must be missing something here? Why is it a problem in this application? the plenum you have is way larger than the volume of air that'll be ingested in one charge, so how can it be an issue?

If you are worried, fabricate a non-streamlined box on the front of the plenum, and feed the air into that at 90-degrees. That'll sort it out for good!

Hi,
Axel, I think the cossie plenums are the same as TD mentions.
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

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My Mini build diary

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."

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

Given the realtively large diameter of the plenum, the dynamic flow properties, in this case velocity, will be negligable.

However, in the case of the side inlet, the proximity of the plenum inlet to the first runner will mean that some of the air will still be travelling at the velocity of the inlet pipe. This may not be a bad thing as it only has to speed up again to go down the runner.

If the air is still travelling at inlet pipe velocity then it will not have converted that energy into pressure at that point of the plenum.

But then if it does not have to go through the changes of state i.e. medium velocity, medium pressure to low velocity, high pressure to high velocity low pressure (all relative) then it may carry more pressure into the runner due to the higher efficiency of the energy conversion.

Thinking out load really, but I find it helps.

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."

It will fit with the centre inlet to the plenum and the TB on the clutch housing.



The breather is in the way at the moment and the IC is sitting on the slam panel, but with a bit of imagination you can see how it will all line up.

Decisions, decisions, decisions..................

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."

I we your problem .... an unnecessary lump attached to the bulkhead between the coil pack and clutch mater ....

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

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

Decision made:



Thanks for the advice chaps.

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."

Hi,
8)
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

Not a lot of progress in the last week or so, as I've got bogged down in the detail on mounting the IACV, inlet air temp sensor and vacuum take offs. Still need three more vac take off on the other end!

Waiting for a M10x1.25 tap to fit the temp sensor.

Machined up the inlet runner trumpets from solid aluminium today.



Back on the exhaust manifold tomorrow although I might do the Peterborough to Wells run with Axel in his Thirty. That will be fun with him driving on L plates!

Edited by Paul S on 9th Jun, 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."

Nice work, here's how mines getting on

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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."