King Kx wrote:
The screen theory has been proven a myth while testing many different engines on a dyno. All the engines were four strokes, making 500-600 hp. Each
Engine gained roughly 25-50 hp by removing the screen. The screen does work in front of a MAF sensor to help create a cleaner signal to the ecm Only when someone has modified air intake piping and cause unwanted turbulance to the sensor. I would be curious to see how the screen affects a two cycle on a dyno and or throttle response. Every Engine and set up can react differently to the same type of modification.
The honeycomb flow straighteners used in industrial applications right before a air station (monitors air flow in the system on the fly) work great, I have seen this first hand when doing testing and balancing on large systems, they usually end up over time getting plugged with dirt, some get so plugged with dirt the force blows out the fragile honeycomb, we take flow data manually before removing them, then took flow data after removing them the system would never run right after they were removed because the air station was confused by all the turbulence and stratified air across the flow station monitor, so we replaced the honeycombs then checked the flow again, once replaced the air station functioned properly.
We also learned they restrict flow (no shit anytime you reduce volume of an area it reduces flow) the restriction and pressure drop is calculated and designed into the system so is not a issue for the HVAC system.
I gustimated the carb will now flow like a 38mm but if it should flow like a 37mm or even a 36mm its more than big enough for this application and use, I could toss it in the lathe and safely bore it to a 40.5mm or as other getting on the edge 41mm, I don't think it needs this.
Flow was not a concern when I did this mod, straightening air flow after the tight turn was the concern.
Having worked on huge HVAC systems trouble shooting them finding damaged and missing turning vanes in elbows I think what the Pilot really needs is to add turning vanes in the elbow, we have diagnosed turning vanes that were right before an air station, after restoring the honeycombs their was a improvement in flow even though the turning vanes in the adjacent elbow were not repaired, after repairing the turning vanes at a later date (plant shut down) the flows increased even more and the system stabilized.
Anybody know how we can mold a new intake boot for the Pilot, one with a larger ID would be nice for the larger carbs..