I spose I could pull my finger out and connect up the velocity probe (my bench can support this) and measure velocity for you chaps as well.... cuh, you dont want much! Though I'm quite sure velocity is'nt falling, if it is it wont be much, I dont make the ports that big, and dont touch the area prior to the split at all.
Dont the DTH bodies mask the injector scoop? I've got some in the unit but not to hand. My DCOE 16v manifold does just that. I did consider adding a lump to fill the scoop but left it due to extra cost for little gain. With the manifold covering the face of the scoop, flow goes up when fitted to a standard, so there maybe an increase in velocity going on. It's not a great deal of difference in terms of flow between an XE and our 16v. In standard form, both heads make around 110cfm, with the XE on a 1mm bigger valve. When ported, a good XE makes 142cfm on the inlet, my best so far is 137cfm from VW 16v, still with standard valves, so 1mm smaller than the XE. The XE, and many other 16'v have a much better combustion chamber design, the VW is poor, sort of half a pent roof, half a bathtub design. The XE also has better exhaust flow, and much bigger bores, so starts to stride away.
Nope, no differance at all Neal. I really must connect up the pitot tube though! I recently did a manifold for a Guernsey hillclimb MK1, so the injector scoops were covered but not filled. It made std 16v power and torque low down up to around 4.5k, the head (not mine, just a fast roady) 276 cams, 45's all coming into play there upwards. Even on a short primary 4-1 manifold and std c.r it didnt lack low end. I feel as long as the cut outs are masked, which a decent manifold will/should do, they can just be left out of the picture. Brian's fill-in's could be handy for those using a poor manifold design.
they do mask it yes, but i always wondered about some back tumble from that area as velocity increases past that crevice there has to be a significant velocity difference from xe to valver with the port size diferences - flow being the same
It's certainly possible. At some point I'll do flow & velocity test on an XE to see the difference. I would have expected to see a flow difference though if there was a great amount of turbulance caused by the scoop.... though the small flow increase I see when fitting one of my manifolds maybe telling us something.
Id imagine in any case it would improve Intake reversion turbulence in that area. Possibly nothing to worry about, but I worry about stuff sometimes. A port can never be too streamlined I feel.
Did anymore results come about? What would this likely do the hurt performance. **** it off if ya want! i know its a bad job! first time just dived in! Its not finshed but i done think il get any gains after reading this thread