1.8T Intake Manifold design and construction.

[KrazyKid]

@Boxersix

If you can’t get the port exactly how it is in the head, don’t bother making it. Minute changes in the port shape can yeild drastic changes on Flow. If you’re going to attempt it, the only other way to do it beside a laser scan is to cut open a junk head on port centerline for the dimensionality. You won’t be able to properly measure roof and floor angles, tapers, etc and those make huge differences in how a port flows.

You should just figure out what one of your heads particular intake ports flows at the max lift your particular cam produces, then CAD a simple restrictor to flow the ports through, you could even alter the flow procedure by flowing just a single port at a time as well.

If you can’t get those specs and the head is off the car, bring it to the machine shop and I can put a dummy spring in one intake valve and flow it on the flow bench for you(you’d just need to know your lift profile/spec of the cam to give to me)

What head is this anyway? I may have a busted/cracked/warped core at the machine shop in cold storage. there’s somewhere between 1500-2000 heads in there. I know I have a couple pallets of 4g63 heads, stacked 4 deep :lol

In all reality though, what you are doing there will account for 75% of any gains you’d see regardless, so going too nuts isn’t necessary(and you WON"T hear that from me often). I went beyond overboard with yettis manifold to grab every last bit of power I could.

RGR that. I hear you. The head is an AEB 1.8T. The one I have is opened up quite a bit from stock.

I might have to take you up on the flow bench actually for the head. would be nice to know what it does over stock from the porting. also I need 5 valves, valve lash checked becasue they are new when I got it from the guy. I have all the specs on the cams too, ill bring all that. I will call you in the AM, well, I see its 1:30am… I will call you later today! lol

and if you dont mind, I promis I wont sell your design, could you send me yettis solidworks file so I can gawk over it? :ninja