front air intake for TB's

[Hanns Per]

this is what works for me best and gives me always ambient temps for the air intake:
Radiator 10 cm slimmer than the original but 20mm thicker i.e. 60mm and one SPAL 13" fan VA10-AP50/C-61A. I just returned from a 4500 km trip through france with temps up to 37 degree and it worked very fine.I will stay with this concept. The only thing I would have made different is to have the radiator intake on the top left side and the outtke on the bottom right side, this because I have an water outlet from the cylinder head which goes to the left side. Here some pics:

these power tapes are part of the test rig not yet final

 

[7 wonders of the world]

it might be the angle of the photo but it looks like he air filter suffers significant distortion against the bonnet which will have quite an effect on performance.

I had the same problem and after tuning he inlet lengths the only option was having about 98% of my air filter on the outside of the bonnet   

[Hanns Per]

Yes the air filter touches the bonnet, however since I do not tracks only fast road I rev normally up to 4500 only when aggressive overtaking more than I id not feel any performance loss. But maybe also because I don't really need it :-). However  this intake forces filtered air into the TB filter and should also deliver enough for cyl. 1. On sparks I did not see any negative impact.