Originally Posted by turbo4agte
From what i read on the NEWEN promotion CD they could fit any amount of angles in on the space of your valve seat insert. Dont quote me on how many angles exactly but its alot! More then anyone would ever want.
The reason why you DONT want totally smooth radiused intake seat angles is because it is beleived to reduce the fuel atomisation of the port in that area.
The sharp transition from angle to angle as the air rushes past is said to help break up the film of fuel on the intake ports into tiny droplets, improving the air fuel mix, bla bla, etc etc. Sorry i couldnt explain that better. Ill try and find a diagram.
Heres a vid of some wet flow testing http://au.youtube.com/watch?v=163HLh74Lks
The radiused seat insert may improve airflow, but any performance gain is soon lost because of the fuel atomising qaulities compared to angles is then lost. However on the exhaust port most people specify to use a radiused seat insert. Obviously because it improves air flow and there is no fuel film. So if you are wondering why a radiused exhaust seat and not intake. Then generally speaking that is what i beleive the answer.
I would only recomend this if you have a LARGE budget. Obviously such technology costs. Most performance engine shops will be able accomodate just about all markets with a 5-7 angle one peice cutter. They also offer full CNC porting for most makes of performance inspired and popular engines.Originally Posted by TERRA Operative
However If you are planning to break records, win highly competetive races or generally just spend alot of money. Send me a PM and i can inform you further. They will not deal direct to public.
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