Inlet manifold flow figures from 034efi

[MarkPS]

Hi

They have now just posted flow results for the RS2 inlet manifold

Interesting!?

http://www.motorgeek.com/phpBB2/viewtopic.php?t=9764&postdays=0&postorder=asc&start=25

Regards
Mark

[s2_bo]

5% less flow than the 3b one!! Thats very odd I would have thought slightly more... but definitely not less??

[Jamo]

I find it hard to believe those results personally as Pisobiker has tested the manifolds and came up with different results IIRC?

[s2_bo]

This would suggest that the 3B IM is superior to the ABY one , let the battle commence.. lol..

[Jamo]

This would suggest that the 3B IM is superior to the ABY one , let the battle commence.. lol..

Dont think so

http://www.s2forum.com/forum/showthread.php?t=186&highlight=manifold+volume

http://www.s2forum.com/forum/showthread.php?t=447&highlight=manifold+volume

[S2 Ant]

3B Manifold



RS2 Manifold

[S2 Ant]

Theres a huge jump between no 3 and no 5 (from left to right) altho that gap is less on the RS item its still a huge drop, i would have thought flow toward the end to be greater as its in the line of the flow and no 1 to be lower due to the angle away from flow.

All makes for an interesting read tho

[Jon441cc]

wagner manifold

http://cgi.ebay.co.uk/Saugrohr-Intak...QQcmdZViewItem

[90quattrocoupe]

These tests are just fine. But no one has answered my Question from earlier in this thread. All these tests were done on a flow bench, which SUCKS air.

But these manifolds are not on NA motors they are on turbo motors. The air is BLOWN in.

Now I am not an engineer, as I said before. It seems to me if you pressurize a pipe, you will change the flow in all the outlets. There has to be some reason that the intake is tapered down toward the end. When you are pushing air, water, or any other medium, it seems you could equalize the flow buy tapering the pipe at the end.

Any one want to comment this time?

Greg W.

[AnLe]

sucking or blowing, doesnt matter, it just the pressure difference between the manifold.

But as someone allready said, this kind of flow testing don't give as nothing else than pritty picture, it does not tell wich manifold is better, becouse in engine, flows are not "steady streams" as in flow bench, air is pushed around when overlap occures, not to mention the firing order that opens valves here-there-last-first-middle, the air has to stop turn and twist, engine is hot and usually people drives with too little turbos and air is hot as hell (just measured tepms on one rs2 in dyno ic in ~55c, ic out 29c and the pipe before throttle 59c, temps are from memory and they are outside of the metal, not air temps) at running engines there are so many variables that predicting how manifold works just looking flowchart is not very rewarding.

For my opinion, and this is opinion, I like to have somewhat matching numbers on runnes as flow, but I like to have it dual champer and somewhat symmetrical form, this is just to easy my mind to thinking its good, no realworld results cant get without dyno the engine.

[Wizard-of-OD]

sucking or blowing, doesnt matter, it just the pressure difference between the manifold.

Bingo,numbers dont lie...

Those that find the tests hard to believe...I guess Javad's 648whp 80 is more than convincing to me.

[AnLe]

If you go to drag races and look around in pitstop, there are many 7-8 sec cars that have intake or exhaust manifolds that are just set of T connections, and they work fine. Intake or exhaust manifold must be VERY bad to reduce max hp, it is all about the other charesteristics, spool up, temperatures, knocking, ease of installation!, what ever you prefer.

std exhaust manifolds are proven many times to get pass 400hp barrier, stock intake well over 500 horses? Yes, they dont cut the max power, but changing to something pretty, might get you same spoolup with bigger turbo, or better range, BUT if turbo is too small or getting clocked up with backpressure, changing to better breathing intake/exhaust may even make the worse, everything is connected to everything.

[Greg_S]

The problem with the standard Exhaust Manifold is that the valves can overheat on a 1 & 5 causing them to break down

[S2 Ant]

surely there would be a noticable difference between sucking and blowing on an inlet manifold..... if you have 5 ports equally sucking instead of 1 blowing theres gonna have to be a difference surely.

[AnLe]

I don't think so, but I have nothing to prove my way or yours, good point for the argument sake, but when in realife engine is in that state that all 5 draws air? So measuring that will not help any way our quest for better breathing.

And for that matter, I think that flow bench numbers are measure one runner at a time?