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

 

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

 

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 .

 

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.

 

prof blair

 

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

 

anything else to add

 

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

 

unequal length also worked for me

 

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

more info please

 

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

 

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?