R2C dirt problems

[wvdirtracer30]

Have any of you guys used the OTR racing air filters and what are your thoughts on them?

[HEAVY DUTY]

I found that out. Luckily I was on the dyno and shut it down. I know guys that use the Wix or Napa gold ( made by Wix). I have also seen catalogs that listed the CFM of the filter. Some paper filters were 500 to 650 to start before they got dirty. That dyno run, made me get a top flow and a 5" filter to make sure I had enough air when dirty.

Have you had the dirt in the your carb with this setup? I had looked at them before but wasn't sure how they would work.

No, you oil the top flow just like the k&n style filter. Have not had any dirt with a R2C filter either, but have only ran it a few

[let-r-eat]

I agree all paper filters aren't the same. I've run AC brand filters and until I see anything out there that is as consistent and has as good a track record I will continue to use them.

[Egoracing]

The top flow allows uncontrolled air into the engine and can effect bowl pressure. It was designed for drag cars and forced induction. I have heard of it causing problems and costing power on oval track cars. It is better to have air flow that is controlled into the carb than just to dump air into it. A quality air filter and a good top and base is more than adequate and will out perform any setup that plugs with dirt or uncontrolled air into the engine. You can test this with a high speed air blower when the engine is on the dyno. You can blow air at the air cleaner and see what the engine does with any filter/top/base combo, A good leaf blower can work.