RS2 versus S2 inlet manifold

[Rikki Kitto]

Just wondered if any engine geeks had views on the technical advantages of RS2 over S2 inlet manifolds.

I know the RS2 one looks pretty cool what with the inscription but is there a big advantage over the standard S2 unit, to be honest at around 10 times the price it should be quite a spectacular improvement really.

[andy10v]

Its the same as an ABY with Porsche on it, no performance benefit.

[Rikki Kitto]

😳wow, really glad I bought a SS inscription plate for £30 and bonded it to my IM now

[SE_30]

A few have commented that the RS2 inlet flow tract is not as good as the ABY,zero or even negative performance gains. The 3b is meant to be as good as if not better than all of them for flow.

Have a search, there are a few threads with some good info covering your question.

[andy10v]

RS2 and ABY are larger volume

3B intake manifold's internal volume is ~3.3 liters and RS2 one is ~4.2 liters (both including the 5 inlet ducts).

And 3B flows more on a static flow bench?

RS2



3B

http://www.motorgeek.com/viewtopic.php?f=18&t=9764&start=100

[Quattronaut]

IMHO that flow bench measurements are thrown-out money. Air flow inside the mani is affected by so much factors, and each of them varies from motor to motor, that nobody can say, what the result in real car using is. Change cams- another flow. Change throttlebody- another flow. Change air piping- guess: another flow. RPM band is 7000rpm variable. No flowbench can simulate that.

From the manis on the pics, I would take the Porsche one- because there is less difference between the cylinders, and IMHO that is more important than that little overall flow numbers. But this also is "trying", not more. Maybe it works little better in some way- but I wouldn´t be surprised if not.

And overall: Up to 500hp it is just the heck...Every common IM (Wagner, AAN, 3b, ABY, ADU) will do the job good enough.

[Classix]

so, if i want to fit on my ABY head rs2 inlet manifold it will fixed like original?

[Christophski]

Does the 3b inlet manifold bolt on and work on an ABY without any modifications to it, or anything around it or that bolts to it? I have a n ice shiny 3b one sat around that would look great on my ABY.

[rxl]

3b intake manifold will not fit as the piping is different and the manifold has other dimensions

[quattrostyle]

Indeed, won't fit around the back of the valve cover.

[sailaz]

but in general all manifolds can be interchanged if piping or something else is not an issue, I mean the fixing points on the head are the same on all 20V heads - RR, NM, 7A, 3B, AAN, ABY, ADU

[newsh]

so, if i want to fit on my ABY head rs2 inlet manifold it will fixed like original?

Yes, it fits exactly the same.

[rxl]

the cam cover is different.

[GazzaG60]

porsche had to do something to make the rs2 different. think they were running out of ideas as the s2 was such a good starter for 10.