QUOTE(Borderline @ Oct 31 2014, 12:23 PM)
Over the years my car has become a dedicated AX car with only a few miles driven on the road just to make sure everything is functioning properly before an AX. The issue is that it takes sooo looong to warm the engine before running. Usually I wait for the engine oil temp gauge to move a little off the peg before my first run, but that means the oil is barely warm. So my plan is to remove the stock oil cooler (yes I have been using the air blockoff mechanism to help warm the engine) to reduce the oil mass and help with warming. The second part of the plan is to remove some blades from the fan so that it doesn't push much air at idle speed but still will cool the engine at speeds above 3k rpm. The question is how many blades to remove and which ones. Anyone have any experience in this department? I've searched back several years and found a couple threads showing some modified fans that they were planning on testing, but have never seen any results. Any suggestions?
First I'd build a fixture that measured the amount of actual air flow with the fan at different RPM.
Once you know the flow you can cut every X number and then measure it again.
Pretty soon you're going to know what each vane cut is worth at each RPM.
With that knowledge you can probably make some good judgements on how many vanes you want to cut and then try in the field.
Right, you might want to pick up a few fans for the experiment.
Or better yet ask Bontempi how many vanes he ran in his race 4.