Inlet manifold flow figures from 034efi

[MarkPS]

Hi

O34 have be flow testing their inlet manifold and the 3b one see link below

http://www.motorgeek.com/phpBB2/viewtopic.php?p=115328#115328

Regards
Mark

[BRY]

Hi

I'd be V interested to see the flow of a stock AAN inlet manifold- any chance?

Regards
Mark

Me too

[repo]

Now please tell me what situation in high horsepower turbo engine that kind of flowbench test simulates?

[MarkPS]

Hi Repo

I admit I have no idea - whats the difference?

Regards
Mark

[repo]

I think if You test the intake like that, IOW by sucking air through one runner at a time, only thing You simulate, is flow rate at at 28 inches of water amount of vacuum.

How You SHOULD test intake then? Well, my 0,02eur is 5 egt probes, and a dyno.

[dets]

I think if You test the intake like that, IOW by sucking air through one runner at a time, only thing You simulate, is flow rate at at 28 inches of water amount of vacuum.

How You SHOULD test intake then? Well, my 0,02eur is 5 egt probes, and a dyno.

Its true, the only true way to find out whether or not the intake is producing more power is with a dyno.


But a flow bench is a bit useful when determining if any pressure drops exist along the intake track.

An expierance flow bench operator is always needed when any of these tests are done. And considering both manifolds were tested, it may be that Javad is preparing to test both manifolds on a dyno to prove the results.

Flow bench testing is tricky because it doesn't take into account the pressure drops and increases that happen when the intake/exhaust timing pulses occur.


Lets wait and see if the how much power the dyno will prove and what the upper limit is on the intake.

[Sweeper]

Btw , dahlback now sells his dual plenum 4cylinder intake manifold for some 450+VAT euros. I think thei nternal design is the same for both 5cyl and 4cyl applications. Maybe someone want to buy and cut it to see the design inside :> ?

[s2dude]

Now please tell me what situation in high horsepower turbo engine that kind of flowbench test simulates?

Flowbench testing replicates HOW the manifold will perform under operational conditions.

It is basically a foolproof measure of how those runners will flow when the engine is boosting (or not as the case may be)

The only difference will be if the engine is measured at very low output (say 3k rpm) the readings will be proportionally lower.

I say this because the flow results from a skilled bench operator will be replicated in the real world......

If you take 5 EGT sensors and place them on the exhaust manifold when using this tested inlet mani I would put money that they will read within 1% of the flow readings given in the bench test.

obviously when corrected as a percentage from Flow reading to EGT (using relevant formulae )

[90quattrocoupe]

One question I never see answered is the one about what difference a compressor makes on the flow of tapered manifold. I am not an engineer or anything, but it would seem that a NA motor sucking air would have different manifold flow characteristics than a turbo motor blowing pressure. Wouldn't the taper help equalize the amount of air flow once the manifold was up to pressure? Once the manifold is up to pressure, and remains pressurized, wouldn't the flow be the same on all the inlet runners?

Just looking to under stand this whole thing.

Greg W.

[dreamer]

S6 manifold

Come across a picture of a 94 S6 which has a 2.2 20v turbo in it and was curious wether the manifold is usable on an S2.

Pic:

http://www.s2forum.com/forum/attachment.php?attachmentid=9347&stc=1&d=1146178499

[jogi730]

Hi,
I do believe that is the AAN manifold as used by many on this forum (including myself on 3B engine) Cheers
Chris

[Corey]

If you are using it on the 3b make sure you have the AAN water manifold also.

[Albert]

or the stock 3B one will have to be modyfied to fit.

[sorens2]

Has anyone got a pic of the 3B modified water manifold ??
I´m soon doing the S6 conversion on my 3B.

Søren S2

[martinjs]

Yes, here's mine.