machine4321

im starting another diy build for the f20b and i was wondering what design is better .


a full radius stack or just a flared type .

i see the full radius on the twm and inside some of the best intak manifolds . (magnus)

discuss

thanks

machine4321

well after hitting up jenvey's FAQ

from what im reading . neither full or flared is the best .

i could be missunderstanding this , but it seems that the horn needs to "curve" only untill 90deg , then it needs a sharpe edge, this is needed to promote air flow from the side but not from behind the horn . ill try to find the pic.

but when thinking about how just about every sport bike is done . they never use a full radius (like the TWM ) that tucks underneith the horn it self


ill find some pics

machine4321

heres what jenvey is saying works the best


heres the horns i used


and here is the full radius



you can see how the full radius will draw air in from behinde the inlet . i guess that isnt a good thing .

hopfully we can get a good disscussion goign .

DonF

You could allways go to profblairandassociates.com and go to the artical section and look for air intake testing. I think it is the 3rd artical down.

mar778c

iTrader: (1)

prof blair

machine4321

cool , i didnt know about that site , looks liek some good reading in there

machine4321

anything else to add

Furyof4

Wow lot of good info on that site. Thank you for sharing.

mmuller

unequal length also worked for me

machine4321

really , as in tunning each stack to a diff lenght ?

more info please

alterdcreations

different lenths for 1,4/2,3 due to cylinder head port differences

skoodles2k6

i know this is for itbs but do ya'll think profblairs research could be good towards a normal intake? i was gonna go with a blox velocity stack on a short ram intake now wondering if i should get something machined like that in their research?