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2G Criticize my port job

fredom dsm

Proven Member
324
43
Jan 31, 2006
Denton, Texas
m in the process porting and polishing my 2g exhaust mani. Should I port some more or should I start polishing? I plan on polishing the runners as well. Thanks.
 

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Kai Hefner

Freelancer
465
224
Jun 21, 2018
Calgary, AB_Canada
Does this add a benefit? I thought that the gases would collide much more due to the sanding down of the barriers.
 

Kai Hefner

Freelancer
465
224
Jun 21, 2018
Calgary, AB_Canada
Thats what I thought as well.
Thought? Did someone change your mind?
It does kind-of look twin-scroll but with twin-scroll manifolds usually the tubes point towards the flange so the gases don't hit each-other head-on. On the stock mani, the tubes go kinda sideways so I think you'll be getting a lot of collision in there.
 

fredom dsm

Proven Member
324
43
Jan 31, 2006
Denton, Texas
Sorry, I miss understood. I thought you were referring to the post above you. I don't plan to the anything else inside the colector, just polish it to try to avoid carbon build up. From what I’ve read all you really need to do is to gasket match (witch im trying to do) and smooth out the runners. The opening as it sits right now is matched to the 7cm gasket ( you can see in the first pic) but I see a bevel, like a little hump. I dont know if thats ok or if it needs to be flat.
 

ec17pse

Freelancer
5,311
2,608
Nov 1, 2008
London, UK, Europe
That crack will only get worse if you dont look after it and stop it now. As if not it shall work its way to the surface and then its a useless manifold! Ideally i would not port a crafked manifold anyway since its only a matter of time and not a very long one at that.

It seems like you rounded the edges to port match rather then square cut to match and make the opening bigger. So try make the whole of the ID bigger and not the surface area as thats not going to be doing anything since the ID will still be a bit smaller
 
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