RS Motorsport :: Classic Speed Restored

Spent the arvo looking at past threads relating to air filters.

I currently use Redline filter socks over the trumpets but I have been told a number of times that this is a rubbish solution as it disturbs the airflow into the trumpet. Anybody got a feel as to just how rubbish? i.e. not ideal vs never use?

I ultimately would still like to build an airbox (as discussed in another thread) but have not done it yet. An option I currently have is to upgrade my filtration to a pair of K&N pancakes and then maybe later encase them in an airbox with a feed of cold air from under or infront of the car.

Questions;
From the past threads it appears that the gap between the tip of the trumpet and the filter/box needs to be either equal to the carb throat diameter or 1/2 the carb throat diameter. Which is it? I have 60mm trumpets and a little over 100mm from the carb face to the strut tower so should be able to get a decent size filter in widthwise.

From the centreline of #4 trumpet to the firewall is only 55mm which seems very tight. Anybody know if that leaves enough room to get a K&N filter in there (cannot find a diagram of the K&N filter dimensions)? The side of the trumpet would probably only be 15-20mm from the filter.

Is it worth considering the ITG/Pipercross filters? Again, have read that the foam stuff is rubbish but alot (even Mr M) use them.

Any difference between using a single length K&N vs 2 K&N's?

Nice. I would much prefer the one piece but need to find a pic of the dimensions to make sure it would fit.

Dimensions are in the description!

G'day mate,
I deliberated over this for a while too. I ended up going with a foam air box from unifilter. It's about 95mm tall from memory and you cut the back plate to suit the carbs. Was a bit of fiddling and work but means you can position it perfectly where you want it. As for fires, as long as its oiled properly and in good condition, it won't catch fire. As for how well it filters, I can't say, that debate falls into the thinking too much about something again category for me. In theory it should be no worse than a k&n and considering its a Tarmac race car that gets used so little in the scheme of things, you'll probably spin another bearing before you wear your bores out through lack of filtration.
I'm on holidays in Greece right now but if you can wait ill do some measurements and post some picks when I return on the 10th.
Cheers,
Llewellyn