Polish of in.manifold channels

[4WheelDrifter]

I see. Done the theory, but not the practical.

[4WheelDrifter]

Here's one I made earlier!

[Rusty]

Something like that. Always been into the practical side of stuff with my old Golf but the complexity of the turbo engine and S2 in general scared the pants off me for a while. Getting there now though! Theory really helps but still doesnt explain what the f*** Audi were thinking at points during the S2 evolution, I can't call it design as there's a blatant ignorance wrt real-world application!

[Rusty]

TAB clear... suddenly everything becomes clear!

[4WheelDrifter]

I've been mucking about with turbo stuff for years. Two strokes when I was a lad. I'm still trying to get to grips with this MPi and Motronic business, since I got my first Coupe nearly four years ago.

[Rusty]

I hate not knowing stuff that I care about and become horrendously obsessive in my persuit of understanding it! Just have to keep plodding along and spend my money wisely in the evolution of my S2 coupe. The knowledge and experience base on the forum is great because as long as you ask the correct questions the answers are a real help. I think it's time for bed now so thanks for the education!

[4WheelDrifter]

LOL.
TAB Clear! Whatever happened to that stuff?

[Rusty]

Hopefully it was removed from the UK never to be seen again. It did ming and I only drank it cos I was 10 and it was cool!

[Rusty]

Going back to the original thread...

Port matching between the head and IM and between the IM and TB would be a worthwhile exercise in maximising flow efficiency going into the engine.

IIRC Exhaust channels should be as smooth and large as possible to maximise the exhaust flow. This is acceptable as turbulence is not required to keep the fuel in suspension (cos it's ben burnt!) and the realtively short length of the port and high velocity of the gasses keeps it in the tubulent region anyway so why impede it's progress? Again, port matching improves efficiency of the flow by reducing drag caused by large changes in cross sectional area. It's all small changes that take time and a bit of skill/confidence but in the end it should all add up to give an improvement.